Controlled drainage system

Abstract

A system for providing drainage from the roof of a shipping container 101, the system comprising: one or more barrier members 137 for disposing or mounting on the top of a shipping container and arran

Description

FIELD OF THE INVENTION The present invention relates to the field of drainage systems, in particular a controlled drainage system for the roof of a shipping container. It is especially effective in relation to canopy roof systems that utilize a shipping container for mounting thereto and the drainage arrangements for such canopy roof systems. It further relates to methods of manufacture and installation of controlled drainage systems and to a canopy storage and protection structure including such a drainage system. BACKGROUND OF THE INVENTION Canopy-type deployable shelters make use of a skeletal support framework covered with a canopy of typically flexible materials such as polymer coated fabrics or plastic panels (e.g. polycarbonate panels). In the case of fabricbased canopy-type structures, these are usually tensioned over the skeletal support framework, which itself may be fixed to one or more foundation supports in order to form a robust and strong shelter structure. The foundation support may be a ground anchor, a supporting wall or in some cases a shipping container. Canopy-type deployable shelters can be of any suitable shape, but are typically and preferably an arch-shape and are optionally provided with gable features that enclose the covered space. These features can include but are not exclusive to full height end walls (which may optionally be of the same material as the canopy) and vehicle and personnel door systems. In these shipping container-supported, canopy-type deployable shelters, each side of the framework is fixed to the top edge of a shipping container, the complete structure is formed where the arch of the canopy roof is flanked by two shipping containers to form a single bay. Multiple canopy structures may be mounted between successive pairs of shipping containers to form a multi-bay shelter arrangement (in which adjacent canopy structures are mounted to a common ‘shared’ / ’medial’ shipping container). The canopy structure is typically mounted to the top edge or side of the shipping container by an elongate mounting bar or combination of mounting bars that extend along the length or span the roof of the shipping container and that are fixed to the shipping container directly via brackets and / or clamps. This mounting bar has connection points to form onward connections to adjacent members of the skeletal framework. An example of a shipping container-supported canopy type deployable shelter is described in GB2559951 and other examples are available from McGregor Group Ltd at https: / / mcgregorstructares.com / product / shield-canopy / and Zappshelter at https: / / www.zappshelter.com / zappshelter-5000 / . One problem with shipping container-supported canopy-type deployable shelters, and with shipping containers in general, is drainage from the roof of the shipping container. When rain falls on the roof of a shipping container (and in the case of canopy structures, falls also on the canopy and flows onto the roof of the shipping container), it accumulates on a typically flat roof space of the shipping container and then flows over the sides of the container. A shipping container roof is typically flat containing transverse raised ribs extending shy of the full width. The roof section at the two short end walls typically has a raised member that runs between the two raised comer castings, while the side wall members are typically of equal height to the lowest point of the shipping container roof panel. Typically, water will flow over the sides of the shipping container. This is far from ideal for the purposes of a canopy-type shelter, where the water tends to flow down the sides of the shipping container into the interior of the sheltered bay formed by the canopy structure. One solution for drainage from the roof of a shipping container is to create a barrier along the side edges, e.g. with sand bags, whereby the water flows over the fore and rear edges of the roof of the container and then optionally wedging the front of the container up so that it slopes slightly to the back whereby water flows over the rear edge of the container only. This is not ideal in that it means the shipping container is disposed at a slight angle, which may not be suitable for its use (which is typically an alternative to its primary use as a shipping container). It is also not a suitable drainage solution when used as a support for a canopy structure since the support structure would need to be level for its own structural purposes. The present inventor has identified a solution by providing a drainage system for the roof of a shipping container that finds particular application in canopy systems that use a shipping container as a support foundation. PROBLEM TO BE SOLVED BY THE INVENTION It is an object of the invention to provide an improved drainage arrangement for the roof of a shipping container. It is an object of the invention to enable effective drainage from a canopy-type structure that utilizes a shipping container as a support. SUMMARY OF THE INVENTION In accordance with a first aspect of the invention, there is provided a system for providing drainage from the roof of a shipping container, the system comprising: one or more barrier members for disposing or mounting on the top of a shipping container and arranged to form a barrier to passage of water over a (preferably each) side edge thereof; and preferably, a drainage means for providing a dedicated drainage flow path to drain water falling or accumulating on the roof of the shipping container. Preferably, according to the first aspect, the one or more barrier members comprise one or more elongate mounting bars for mounting on the top of a shipping container and arranged to form a sealed barrier to water proximal to a side edge thereof. Preferably, the system further comprises a mounting means for securing the mounting bar(s) to the upper edge surface of the shipping container, and still more preferably, the drainage means is configured to provide a drainage flow path through or by the sealed barrier to a drainage outlet. In a second aspect of the invention, there is provided a canopy shelter structure system comprising at least one shipping container and mounted thereto a canopy shelter structure, the canopy shelter structure comprising a skeletal support framework and a canopy cover, the system further comprising at least one barrier member mounted on top of the shipping container and arranged to form a barrier to the passage of water over a side edge thereof, and, preferably, a drainage means for providing a dedicated drainage flow path for water falling or accumulating on the roof of the shipping container wherein the skeletal support framework is mounted in relation to at least one barrier member such that water running off the canopy cover is directed onto the roof of the shipping container inward from at least one barrier member. Preferably, the canopy shelter structure further comprises an elongate mounting bar mounted to an upper side edge of the shipping container for mounting the skeletal framework to, which elongate mounting bar serves as the barrier member. Preferably, according to the second aspect, the at least one elongate mounting bar is configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted, and preferably the at least one mounting bar is secured to an upper edge surface of a shipping container by a plurality of mounting elements. In a third aspect of the invention, there is provided a method of construction of a canopy shelter structure system, the method comprising: providing at least one shipping container and disposing the shipping container relative to a second shipping container or a further support structure to define a space (e.g. a bay-space) to be covered by the canopy shelter structure; providing one or more barrier members, preferably elongate mounting bars, and mounting the barrier members on a top surface of the shipping container (e.g. by way of a plurality of mounting elements for securing the barrier members or mounting bar(s) to an upper edge surface of the shipping container), to form a barrier (preferably a sealed barrier) to the passage of water on the top surface of the shipping container; mounting or constructing a skeletal support framework on to the barrier members so that the skeletal support framework forms a span between the two shipping containers or between the shipping container and the further support structure; and disposing a canopy cover over the skeletal support framework and securing the same. Preferably, according to the third aspect, the elongate mounting bars are configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted. In a fourth aspect of the invention, there is provided a mounting bar for mounting a canopy shelter framework to, and for mounting to a shipping container via a plurality of mounting elements. The mounting bar is configured to form a barrier to the passage of water from the top surface of the shipping container and configured to form a seal by way of compressing a resiliently conformable or compliant surface material to form a seal on at least one surface thereof. In a fifth aspect of the invention, there is provided a skeletal support framework, as defined above. In a sixth aspect of the invention, there is provided a kit-of-parts for a drainage system for a shipping container, as defined above. In a seventh aspect of the invention, there is provided a kit-of-parts for a canopy shelter structure or a canopy shelter structure system as defined above. In an eighth aspect of the invention, there is provided a multi-bay canopy shelter structure system, which comprises at least three shipping containers arranged in parallel separated by at least two bay-spaces and at least two canopy shelter structures mounted to the three shipping containers to span respective bay-spaces, wherein at least one of the shipping containers is provided with a shipping container roof drainage system as defined above. ADVANTAGES OF THE INVENTION The systems and method of the invention provide an improved drainage solution for a shipping container roof and an improved canopy shelter structure whereby water flowing from the canopy roof onto a shipping container is drained to a drainage outlet (available for diverting in any desired way) in a controlled way without freely draining into the interior (sheltered area) of the shelter structure or simply overflowing the recessed roof space of the shipping container. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1A is a perspective view of a shipping container; Figure IB is a perspective view of an upper comer portion of a shipping container; Figure IC is a perspective view of an upper comer portion of a shipping container showing weld detail; Figure 2 is a perspective view of a shipping container with an embodiment of the drainage system of the present invention fitted; Figure 3 is a perspective view of the shipping container of Figure 2, with a skeletal stmcture of a canopy shelter mounted thereon; Figure 4A is a perspective view of an elongate mounting bar, being part of an embodiment of the drainage system of the present invention; Figure 4B is a perspective view of a skid joiner, being part of an embodiment of the drainage system of the present invention; Figure 4C is a perspective view of a clamping member, being part of an embodiment of the drainage system of the present invention; Figure 4D is a perspective view of a comer clamp, being part of an embodiment of the drainage system of the present invention; Figure 4E is a perspective view of an outlet plate, being part of an embodiment of the drainage system of the present invention; Figure 5A is a side view of an upper comer portion of a shipping container with an embodiment of a drainage system of the invention part-fitted; Figure 5B is a side view of an upper comer portion of a shipping container with an embodiment of a drainage system of the invention fitted; Figure 6A is a side view of one end of a shipping container with a drainage system fitted and a drainage pipe fitted thereto; Figure 6B is a perspective view of the arrangement in Figure 6A; and Figure 7 is a representation of a multi-bay canopy shelter structure system of an embodiment of one aspect of the invention. DETAILED DESCRIPTION OF THE INVENTION The invention concerns a system for providing drainage from the roof of a shipping container (“container drainage system”) and a canopy shelter structure system comprising canopy shelter structure of a skeletal support framework and a canopy cover mounted to at least one (and preferably two) shipping container(s) and a barrier member (preferably in the form of an elongate mounting bar) mounted on top of the shipping container to form a barrier to the passage of water over a side edge thereof and optionally comprising container drainage system and a method for construction or installation thereof. In accordance with the invention, a system for providing drainage from the roof of a shipping container comprises one or more barrier members for disposing or mounting on the top of a shipping container and arranged to form a barrier to passage of water over one or each side edge thereof, and preferably a drainage means for providing a dedicated drainage flow path for water accumulating on the roof of the shipping container. The barrier members are configured to inhibit or prevent water accumulating on the roof of the shipping container from flowing over the side of the shipping container at which it is disposed, at least to the height of the barrier member. The barrier member is typically of a water-impenetrable material, but could also have a proportion of water absorbent material, e.g. on an inner surface thereof, which could be configured to expand on absorption of water in order to help form a seal, but in any case inhibits the flow of water over the sides of the shipping container. The barrier member(s) may prevent the flow of water over the side of the shipping container by, for example, having at least one conformable surface or layer or being conformable and weighted or by the provision of a seal or sealing layer. Since the top surfaces of the shipping container may not be flat, e.g. due to weld lines, it is advantageous to ensure that the barrier member(s) form a seal against the surface of the shipping container. In the case of a seal or sealing layer, this may be a separate layer from the barrier members, an integral layer of the barrier, or may be provided by way of an adhesive or sealant (such as silicone sealant or expanding foam or foam tape) provided between the barrier members and the shipping container. In preferred embodiments, the seal or sealing layer is provided as a separate, or discrete, layer from the barrier or as a layer integral with the barrier. In certain preferred embodiments, sealing layer is a conformable and resilient layer or surface for forming a seal between the barrier member and the upper surface of the shipping container on which it is disposed. Where a resiliently conformable layer or surface is provided in order to form a seal between the barrier and the upper surface of the shipping container, it is typically necessary, in order to form that seal, for sufficient force to be provided such that the resiliently conformable layer or surface is put into a configuration in which it conforms with the upper surface of the shipping container and is retained in such a configuration in order to maintain the resultant seal. This may be achieved, for example, by providing a suitably weighted barrier member that would serve to compress the resiliently conformable layer to thereby form a seal, or by securing the barrier member(s) to the upper surface of the shipping container by suitable fixings, for example, a mounting means such as clamp members, whereby a force is applied in order to compress the resiliently conformable layer to thereby form a seal which seal is maintained by use of the fixings or clamp. Preferably the barrier members are provided on a top surface of a shipping container proximal to a side or preferably each of two opposing sides of the shipping container. In each case, the barrier member is preferably provided or may be fitted on the upper surface of the roof of the shipping container preferably at or proximal to a side edge thereof, which may be referred to herein as the upper edge surface of the shipping container. The shipping container for which the system may be used is typically and preferably an ISO shipping container and, in any case, may typically be constructed having a rectangular frame of four comer posts with bottom and top end rails at one end (or both ends) of the rectangular frame and door sill and headers at the other end (or both ends) of the rectangular frame. The rectangular frame further comprises bottom and top side rails on each side of the frame, extending between the comer posts. Side panels are disposed in the space defined by and typically welded to the comer posts and top and bottom side rails. The side panels are typically castellated or cormgated and may be level with or slightly recessed relative to the outside surfaces of the top and bottom side rails, but may also be provided with side opening doors instead of the side panel. A floor stmcture is provided in the lower part of the frame in the space defined by the bottom side rails, door sill and bottom end rails. Doors are typically provided at one end and a rear end panel at the other (typically castellated or cormgated). A roof panel is provided in the space defined by (and typically welded to) the top side rails, the top end rail and the door header, such that it is about level with (or slightly recessed relative to) the top side rails and is level with or more typically recessed relative to the door header and / or top end rail. The roof panel may be a flat panel, but is typically cormgated or castellated or provided with ribs that preferably do not extend the full length or the full width of the roof panel. The top side rails extend between comer castings (which are provided with recesses and aperture to facilitate lifting) formed at the top of the comer posts. The comer castings typically project upward above the top surface of the top side rails. The roof of the shipping container may be considered to be formed of the roof panel, an upper surface of the front-end door header and the upper surface of the opposing top end rail and the upper surfaces of the two opposing top side rails. The door header and the top end rail (or both of two opposing door headers or top end rails) typically form raised lips relative to the roof panel (and project higher than the side end rails) - these may together be referred to as front / rear raised lips or upwardly projecting lips. Top side rails are preferably elongate plate member or tubular members, for example flat steel plates or flat-topped, square or rectangular, tubular section members, welded at each end to comer posts or, more typically, the comer castings disposed at the top of the comer posts of the shipping container. The upper edge surface of the shipping container, as used herein, preferably comprises or may consist of the upper surface of the top side rails of the shipping container. Thus, preferably, the one or more barrier members according to the system may be positioned to form a seal between the barrier members and an upper surface of a top side rail of the shipping container, preferably the upper surfaces of both top side rails. In normal use, when water is disposed (e.g. when it rains) on the roof of a shipping container disposed on a flat surface and with no roof drainage system or the like, water will accumulate on the roof surface (and, in particular, on the roof panel), and flow over the side edges (over the top side rails which are typically level with the roof panel) of the shipping container, and potentially over the front and rear edges unless the top end rail and / or door header define a raised lip. Thus, water will typically flow from the roof panel over at least the sides of the shipping container. Each barrier member used in the system may be a flexible or malleable member or may comprise a rigid member. Where the barrier member is a flexible or malleable member, such as an elongate solid or hollow rubber rod (e.g. of rectangular or circular crosssection), it may be configured to form a seal against an upper edge surface of a shipping container by the provision of an adhesive sealant to either the upper edge surface of the shipping contain or to the flexible or malleable member (or both) and securing together. Alternatively, it may be secured to the upper edge surface of the shipping container by suitable securing or clamping means so as to cause the flexible or malleable member to resiliently conform, or mould, to the shape of the upper edge surface forming a seal against it. Where the barrier member comprises a rigid member, it may be adapted to form a seal against an upper edge surface of a shipping container by the provision of an adhesive sealant to either the upper edge surface of the shipping container or to a (lower) surface of the rigid member (or both) and securing together. Preferably, the rigid member is configured to be sealed against the upper edge surface of the shipping container by a discrete or integral (with the rigid member) sealing layer. The sealing layer is preferably a resiliently compressible sealing layer, such as a rubber, synthetic rubber or silicone layer. The seal may be formed, in the case of a discrete sealing layer, by disposing an elongate sealing strip of a sealing material along the length of the top side rail of the shipping container, disposing one or more rigid barrier members on the elongate sealing strip and applying a suitable force to the rigid barrier members to cause the elongate sealing strip to resiliently conform to the shape of the upper edge surface of the shipping container (e.g. by compression of the elongate sealing strip) and retaining the seal by retaining the force by way of application of weight to the upper surface of the rigid barrier members or by clamping or otherwise securing the barrier members in place against the shipping container. In the case of a barrier member comprising a rigid member and an integral sealing layer, e.g. a layer of sealing material formed on at least one surface of the rigid member, the barrier member is placed, sealing layer down, against the upper edge surface of the shipping container, and then applying and retaining a force sufficient to cause the sealing layer to resiliently conform (e.g. by compression thereof) to the upper edge surface and form a seal against it. The force may be retained by the provision of suitable weights, adhesive, strappings or, preferably, clamps or other means of securing the barrier member to the shipping container. In a preferred embodiment, the barrier member is an elongate mounting bar comprising a rigid bar, preferably having a layer of resiliently conformable material on at least one elongate surface thereof, which may be secured on the rigid bar by an adhesive or may be slotted into a receiving channel formed on the rigid bar and / or secured to the rigid bar by clips that extent into corresponding fixing holes on the rigid bar. In one embodiment, plastic firtree clips are used to secure the layer of resiliently conformable material to the rigid bar by pushing them through holes formed in the resiliently conformable material and into fixing holes in the rigid bar and, optionally, also by slotting the resiliently conformable material into a corresponding recess or channel on the rigid bar. The elongate mounting bar may have any suitable cross-sectional shape, such as rectangular, square or other quadrangular, triangular, pentagonal, hexagonal, hemispherical, provided there is a flat surface suitable for forming a seal against the upper side surface of a shipping container. To provide a barrier to prevent the flow of water over a side edge, two or more elongate mounting bars may be provided for disposal end-to-end along the length of the top side rail of the shipping container. A mounting bar as described above may be a solid bar, or may be a hollow (tubular) bar that is optionally filled or unfilled (empty / hollow) and optionally with end caps or a sealed end. The mounting bar(s) may be made of any suitable material, such as plastic, fibre-reinforced plastic or metal, but are preferably metal (e.g. aluminium or steel). In certain embodiments, as described above, the barrier member(s) may be secured in position at the upper side edge of the shipping container by clamping members. The clamp members preferably comprise a first engagement element for engaging the barrier member and a second engagement element for engaging with a side panel of the shipping container and / or with the top side rail of the shipping container and a linking element and which clamp member comprises a clamping or retention mechanism. Preferably, the clamp members have an engaged configuration in which the clamp is engaged with each of the barrier member and the shipping container so as to maintain a seal between the barrier member and the shipping container and a disengaged configuration in which sufficient force to cause resilient conformation of a sealing layer is not provided and the clamp may be removed from engagement with the shipping container and the barrier member. In a simple form, suitable for use with a preferred rectangular cross-section mounting bar, the clamping member comprises a mounting bar-engaging member having a hooking feature for resting on an upper surface of the mounting bar and extending over an edge thereof to contact an inner facing surface of the mounting bar and a top side rail engaging member extending generally the same direction as the mounting bar-engaging member only at a separation corresponding to the thickness of the mounting bar and top side rail and having a top side rail contacting portion, the mounting bar-engaging member and the top side rail-engaging member being linked by a linkage element (such as in the form of an upright element, the clamping member having an engaging element in the form of a threaded screw extending through the top siderail engaging member and contacting the underside surface of the top-side rail, the threading of which increases the clamping pressure between the mounting bar and the top side rail (in order to form and retain a seal therebetween). It is preferred, in any of the embodiments of the barrier members, that a seal is formed between the barrier members and the upper edge surface of the shipping container for a full length of the side rails. Preferably, a seal is also formed between the barrier members and the respective fore and rear inward facing surfaces of the comer castings, preferably for the full upright extent of the comer castings. Preferably the seal formed between the barrier members and the upper edge surface of the shipping container is continuous along the length of the top side rails and the fore and rear inward facing surfaces of the comer castings. Where the barrier member is a rigid member, such as a mounting bar as described above and where the seal is provided by a resiliently conformable sealing layer (whether discrete or integral with the mounting bar), it is preferred that the system provides and maintains a degree of force in the longitudinal direction (of the mounting bar) in order to cause the resiliently conformable seal layer to conform to the fore and rear inward facing surfaces of the comer castings. In principle, this could be achieved by making the cumulative length of the mounting bar (or bars) and the sealing layer thickness marginally greater than the length of the top side rail, or otherwise achieving formation and retention of the seal longitudinally. Similarly, where more than one mounting bar is used in longitudinal end-to-end arrangement, it should preferably be ensured that there is a seal between the abutting ends of the mounting bar or between proximal ends of longitudinally disposed mounting bars and any spacer member therebetween. The lack of a seal between mounting bars or between mounting bars and the comer castings may lead to water leakage over the sides of the container. Optionally, where the top end rail(s) and / or door header(s) do not provide raised lips but instead are essentially level with the roof panel, the system may comprises one or more end barrier members for disposing on the roof of the container proximal to fore or rear end edge, the end barrier members being otherwise as described above for barrier members / side barrier members. In one such embodiment, the system may comprises two opposing side barrier members and a rear end barrier member and / or a fore end barrier member, in order to inhibit passage of water from the roof of the container over respective edges. Optionally, if the capacity to collect and / or drain a larger volume of water on the roof of shipping container is desired, the system may further comprise side barrier members for disposing on each upper side edge of the shipping container and projecting above the comer castings, end barrier members for disposing on the fore and rear end edges (e.g. on or over the projecting raised lips provided by end rails or headers) again projecting above the comer castings, and comer post extensions (e.g. for fitting within the comer castings) and projecting to a height proximal to the height of the side barrier members or end barrier members. As with the embodiments above, each barrier member should be configured to form a seal with the upper surface of the container and, preferably, with both the corresponding inward facing surfaces of the comer castings and the inward facing surfaces of the comer post extensions. Furthermore, at least a partial seal should be provided between the comer post extensions and the upper surface of the comer casting (e.g. at least at the inner comer thereof), for example, by providing a resiliently conformable layer between the comer post extensions and the comer castings. The resultant system, when fitted to a shipping container allows for a larger volume of water to be retained within the volume defined by the container roof and the barrier members for any suitable purpose (e.g. as a water storage butt for recovered water usages) and controlled drainage (when a suitable drainage means provided) or for temporary storage from an intense downpour of rain, which may otherwise overcome the drainage capacity. In all the above aspects and embodiments, the system according to a preferred embodiment of the invention comprises a drainage means for providing a dedicated drainage flow path for water accumulating on the roof of the shipping container. The drainage means may be any suitable drainage means that provides a flow path. For example, in an embodiment where a side barrier member is provided at one side edge of a shipping container roof, the drainage flow path may be provided by the unobstructed opposing side edge or a rear end (in an embodiment where the top surface of the top end rail is level with the roof panel) of the shipping container. Preferably, the flow path is a dedicated flow path to or through a drainage outlet. The flow path may be provided through or by the side barrier member(s) and / or through, by or over the end of the shipping container (e.g. a projecting raised lip of the shipping container, such as may be provided by a rear top end rail or an end barrier member formed thereon). The drainage means may provide passive drainage, whereby, when the volume of water reaches a certain level within the volume defined by the roof panel, the front and / or rear raised lips (or barrier members thereon) and the side barriers (referred to as the dammed volume hereinafter) so that it may flow in to one or more openings of the drainage flow path, then it simply flows through the one or more openings of the drainage flow path. Alternatively, the drainage means may comprise a siphon arrangement, which may serve to increase the water drainage rate from the dammed volume once a pre-determined water level within the dammed volume is reached. A siphon arrangement may be provided external to the dammed volume, by which it is meant that a drainage flow path may be provided from within the dammed volume through or by the side barrier members and / or the front and / or rear raised lips (or an end barrier member disposed thereon) to a siphon arrangement disposed external to the dammed volume and leading to a drainage outlet. In this case, the siphon will be configured to initiate once a water level has reached a pre-determined (trigger) level within the dammed volume, that is below the lowest barrier height (e.g. the height of the rear raised lip) at which point the water contained within the dammed volume will be siphoned out through the drainage flow path to the drainage outlet until the siphon is broken, at which point the water level within the dammed volume will be allowed to rise until the siphon initiation point is reached again. In an alternative embodiment of the drainage means comprising a siphon arrangement, a siphon arrangement may be provided that allows the drainage flow path to be through a conduit, extending from close to the upper surface of the roof of a container and over the end raised lip or side barrier member and be siphoned to a drainage outlet. Such an arrangement would be expected to require a discrete siphon initiator, configured to initiate the siphon once the water within the dammed volume reached a certain level and before the amount of water exceeded the dammed volume. The siphon initiator may optionally be a pump, operated by a battery or other electrical source configured to pump water from within the dammed volume into the conduit with a sufficient pulse to initiate the siphon, when the water level is detected at predetermined level (e.g. by way of a suitable water sensor). Alternatively, the siphon initiator may be a discrete passive initiator, which captures rainfall at a raised level and releases a bolus into the siphon outlet once a pre-determined volume of rainfall is captured so as to initiate the siphon, which will then siphon the water from the dammed volume to the drainage outlet until the siphon is broken. In a further alternative embodiment of the drainage means, the drainage means is provided by a conduit passing over or through the raised lip or side barrier member or optional end barrier member and fitted with a pump in order to pump water out of the dammed volume and to a drainage outlet. Typically, the pump will be configured to operate for a pre-determined time once the water within the dammed volume reaches a pre-determined level, detected by a water sensor. The drainage means, according to a preferred embodiment, provides passive drainage. Preferably, the passive drainage arrangement provides for drainage by or through the side barrier member or by, through or over the front and / or rear raised lips or an end barrier formed thereon or provided where the top end rail and / or header is level with the roof panel, or over a rear end edge (e.g. if there is no raised lip or barrier or if the raised lip is lower than the side barriers). It should be noted that all the passive drainage arrangements are preferably also compatible with at least the external siphon drainage arrangements described above. In certain embodiments, the drainage means comprises one or more drainage flow paths through the rear end raised lip or an end barrier disposed at a rear end edge. In one such embodiment, the drainage means comprises one or more drainage flow paths defined by conduits through the rear end raised lip (e.g. defined by a top end rail) or an end barrier member formed at a rear end edge (e.g. over the raised lip). In each case, the conduits may pass directly through a defined tube extending through the raised lip or end barrier member from an opening inlet at shipping container roof panel level or between the roof panel level and the level of the side barrier member to a drainage outlet on the exterior side of the rear end raised lip or end barrier member, in relation to which outlet, optionally, further drainage may be arranged. In another such embodiment, the drainage means may comprise one or more drainage flow paths defined by a conduit which includes a tubular top end rail or a tubular end barrier member whereby water may flow into the tubular top end rail or tubular end barrier member via one or more openings in the inward facing surface thereof and may drain from the tubular top end rail or tubular end barrier member via one or more drainage outlets formed, for example, on an outward facing surface thereof. Thereby, the internal volume of a tubular top end rail or optional tubular end barrier member may form part of the drainage flow path. In certain embodiments, the drainage means may comprise one or more drainage flow paths through the side barrier members and / or top side rail of the shipping container. In one such embodiment, the drainage means comprises one or more drainage flow paths defined by conduits through the side barrier members and / or top side rail. In each case, the conduits may pass directly through a defined tube extending through the side barrier members and / or top side rail from an opening inlet at roof panel level or between the roof panel level and the top level of the side barrier member to a drainage outlet on the exterior side of the side barrier members and / or top side rail, in relation to which outlet, optionally, further drainage may be arranged. In another such embodiment the drainage means may comprise one or more drainage flow paths defined by a conduit which includes a tubular top side rail or a tubular side barrier member whereby water may flow into the tubular top side rail or tubular side barrier member via one or more openings in the inward facing surface thereof and may drain from the tubular top side rail or tubular side barrier member via one or more drainage outlets formed, for example, on an outward facing surface thereof. Thereby, the internal volume of a tubular top side rail or tubular side barrier member may form part of the drainage flow path. In a yet further such embodiment (and preferred embodiment), the drainage means may comprise one or more drainage flow paths defined by prescribed gaps in the side barrier member, which may be defined by gap-forming components. For example, the arrangement of side barrier members on the top side edge (e.g. on the top side rail) of a shipping container may be such that the barrier member (e.g. mounting bar) may be such as to leave a gap between an end of the barrier member and an inward facing surface of a comer casting or to leave a gap between two longitudinally arranged barrier members (e.g. mounting bars). The gap or gaps may preferably be occupied, covered or blocked by gap-forming components that facilitate drainage through the gap. For example, a gap-forming component may comprise a barrier wall configured to cover the gap along at least one face thereof, in which barrier wall there is an aperture formed which leads to a drainage outlet on an exterior surface of the barrier wall, which may optionally be adapted to connect with an external drainage system (eg a flexible pipe leading down to ground level surface drainage). The gap-forming component is preferably configured to be secured in position in or over the gap, for example by fixings to secure the gap-forming component relative to a side barrier member and / or a second side barrier member or a comer casting. Preferably the gapforming component is provided with a seal (e.g. about the perimeter thereof) to ensure that leakage of water between the side barrier member and / or the comer casting and the gap-forming component is inhibited (other than through the drainage aperture formed therein). In each case, the drainage outlet may further be connected or lead (e.g. by way of a rigid or flexible pipe) to any suitable downstream provision, which may be, for example, a public drainage system, a dedicated private drainage arrangement, a water storage butt, a sump or simply released external to the container. Typically, a drainage outlet or other drainage aperture defining a drainage flow path may be the rate-limiting feature of a drainage flow path of drainage means of a preferred embodiment of the invention. For simplicity, we refer to the drainage outlet size, but note that the principles referred to may equally apply to another drainage aperture in the drainage flow path that is the rate determining feature (e.g. a drainage inlet where a drainage inlet leads to an internal flow path, in or through a barrier member, to a drainage outlet). The system may have any suitable number of drainage outlets (or drainage inlets, and drainage flow paths). For example, there may be one or two drainage outlets associated with each side barrier member and / or top side rail or any end barrier member, for example, one at each end of each side barrier member. Thus, in one embodiment, there may be four drainage outlets, each connected to one or more drainage conduits, which should be sized to accommodate the maximum flow rate through the drainage outlet. The drainage outlet(s) may be sized according to the number of drainage outlets provided and the rate of drainage required or desired. The drainage outlet (or inlet) may be of any suitable shape, for example circular, semi-circular, a circle segment (e.g. major segment), square, rectangular. Preferably, it is shaped to maximise flow through a lower part thereof. A drainage outlet may be selected to have a cross-sectional area of from 3 to 20 cm2, preferably from 5 to 15 cm2, more preferably at least 7 cm2 and still more preferably from 10 to 13 cm2. In one particular embodiment, a drainage outlet (or inlet) cross-sectional area of 11 to 12.5 cm2 may be provided. In one embodiment of the system of the invention, there are two opposing barrier members disposed on the roof of a container (one barrier member along each of the two long edges / top side rails of a shipping container) and at least one drainage outlet through or by one or each of the barrier members. In one particular configuration, the opposing barrier members have a height of 6 cm. This means that for a standard shipping container with a length of 20 foot (approximately 6 m), the dammed volume will be approximately 860 litres, while for a 40 foot container (12 m), the dammed volume will be approximately 1640 litres. Thus, the drainage outlet cross-sectional area (or cumulative cross-sectional area of multiple outlets) should be selected so as to have a drainage rate of greater than a predicted accumulation rate once the dammed volume has been reached, in order to avoid overflow of the system. By way of example, it is believed that a 12 cm2 cross-sectional area outlet will have, at a full dammed volume (having a 6 cm height barrier), a drainage rate of approximately 410 litres per hour. The cumulative drainage rate can be multiplied by providing multiple drainage outlets, as discussed above, such that a system with four such drainage outlets may have a drainage rate of 1640 litres per hour. In a preferred embodiment of the container roof drainage system of the invention, the barrier members comprise elongate mounting bars for mounting on the top of a shipping container and arranged to form a sealed barrier to water proximal to a side edge and the drainage means is provided by a gap between an end of the elongate mounting bar and an inward facing surface of a comer casting, which gap is occupied, covered or blocked by a gap-forming component that facilitate drainage through the gap. The gap-forming component may be any suitable component that services to fdl or cover the gap and is provided with a drainage flow path or drainage outlet to enable drainage of water from the shipping container roof and is preferably a plate member for covering the gap, the plate member having a drainage outlet formed therein, which drainage outlet is preferably positioned, in situ, proximal to the level of the top side rail upper surface. Preferably, the container roof drainage system comprises a comer clamp mountable to a comer casting with a bridging member for bridging the gap between the comer casting and the elongate mounting bar. The bridging member may be secured to the elongate mounting bar and may provide a base for fixing a gap-forming component to. Preferably, the bridging member extends from and is pivotally mounted to a comer clamp base and preferably has an end-member extending orthogonally from an underside of the bridging member, which end member comprises a rigid plate element and a sealing layer, whereby when the bridging member is located to bridge the gap between the comer casting and the elongate mounting bar, the end-member is disposed proximal and parallel to an inward-facing surface of the comer casting and the sealing layer forms a seal therebetween (the sealing layer preferably being a resiliently compressible sealing material). Preferably, the gap-forming component covers the gap by overlaying an outer perimeter of the gap and, with a sealing layer (e.g. of resiliently compressible sealing material), forms a seal along an outer surface of the elongate mounting bar, the bridging member, the end-member and the top side rail of the shipping container, so that the only passage of water through the gap is via the drainage outlet formed in the gap-forming component. There is further provided, in a second aspect of the invention, a canopy shelter structure system that comprises at least one shipping container and mounted thereto a canopy shelter structure. The canopy shelter structure may span a space (e.g. a ‘bay-space’) between a shipping container and a further support structure or may span between two shipping containers. Preferably, the canopy shelter structure system comprises at least two shipping containers. The canopy shelter structure comprises a skeletal support framework and a canopy cover for fitting over the skeletal support framework. The canopy shelter structure system further comprises at least one barrier member mounted on top of the shipping container and arranged to form a barrier to passage of water over a side edge thereof, and, preferably, a drainage means for providing a dedicated drainage flow path for water accumulating on the roof of the shipping container, wherein the skeletal support framework is mounted in relation to the at least one barrier member such that water running off the canopy cover is directed onto the roof of the shipping container inward from the at least one barrier member (i.e. toward the middle of the roof of the shipping container relative to the barrier member). Preferably, the canopy shelter structure system comprises a container drainage system as described above and elsewhere herein. Preferably, the canopy shelter structure further comprises an elongate mounting bar mounted to an upper side edge of the shipping container for mounting the skeletal structure to, which elongate mounting bar serves as the barrier member. Preferably, the at least one elongate mounting bar is configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted, and preferably the at least one mounting bar is secured to an upper edge surface of a shipping container by a plurality of mounting elements. Preferably, each shipping container of the system includes, in addition to the elongate mounting bar to which the skeletal support framework is mounted, a second, opposing, elongate mounting bar mounted in relation to an opposing upper edge surface (e.g. an opposing top side rail) of the shipping container in a manner that forms a seal at that opposing upper edge surface. Optionally, the canopy shelter structure system comprises two or more canopy shelter structures arranged in parallel arrangement to span gaps between three or more appropriately disposed (e.g. parallel) shipping containers -at least two terminal shipping containers and one or more medial shipping container. For example, three shipping containers may be disposed side-by-side defining two separations or gaps (i.e. bay-spaces) to be spanned - this arrangement can be referred to as a multi-bay or multi-span setup. A canopy shelter structure may be mounted in relation to the near upper edge surfaces of a first (terminal) and a second (medial) shipping container, to span the space in between, preferably by mounting to elongate mounting bars that form part of a container roof drainage system as described above. A second canopy shelter structure may be similarly mounted in relation to the near upper edge surfaces of the second (medial) and a third (terminal) shipping container, to span the space in between. Thus, the second, or middle, shipping container thus has a canopy shelter structure mounted at each opposing upper edge surface, typically on an elongate mounting bar that is mounted at the upper edge surface (e.g. on the top side rail) of the shipping container and which forms part the drainage system for the container roof as described above. The first and third (terminal) shipping containers preferably also have drainage systems formed thereon. Optionally, further canopy shelter structures may be provided in series in relation to further shipping container support structures. Thus, in a further embodiment and in an eighth aspect of the invention, there is a multi-bay canopy shelter structure system, which comprises at least three shipping containers arranged in parallel separated by at least two bayspaces and at least two canopy shelter structures mounted to the three shipping containers to span respective bay-spaces, wherein at least one of the shipping containers is provided with a shipping container roof drainage system as defined above. The at least three shipping containers according to this (multi-bay) aspect comprise at least two terminal shipping containers, mounted along one nearside edge with a canopy shelter structure and at least one medial container, characterized in that it is mounted on both opposing edges by respective canopy shelter structures. Optionally, there are multiple (i.e. two or more) medial shipping containers and in each case one more canopy shelter structures than there are medial shipping containers. Preferably, the or each medial shipping container is provided with a shipping container roof drainage system as defined above. Preferably, the shipping container roof drainage system provided on each medial shipping container comprises at least one barrier member, e.g. in the form of an elongate mounting bar configured to form a sealed barrier to water proximal to a side edge of the shipping container to which it is mounted, and that one barrier member is provided to each of the opposing upper side edges of the container roof, in order to prevent water flowing from the container roof into the bay-space(i.e. the sheltered space beneath the canopy) under / through a side edge of the canopy shelter structure that is mounted to the container roof or side wall or intersection of both the roof and side wall. Preferably, each medial container is provided with a drainage means for providing a dedicated drainage flow path to drain water falling or accumulating on the roof of the shipping container, which may be by or through one or both opposing elongate barrier members. Preferably, the elongate mounting bars that serve as barrier members on the medial shipping containers are used to mount a skeletal support framework (of a canopy shelter structure) to. Preferably, each terminal shipping container comprises at least one barrier member disposed or mounted on a top nearside edge of the shipping container proximal to where the canopy shelter structure is mounted and arranged to form a barrier to passage of water over each side edge thereof. Preferably such a barrier member comprises one or more elongate mounting bars for mounting on the top of a shipping container and arranged to form a sealed barrier to water proximal to a side edge thereof. Preferably the canopy shelter structure is mounted to the barrier member, preferably in the form of an elongate mounting bar. Thus, water falling or accumulating on the roof of a terminal shipping container may flow or drain over an outer side edge of the shipping container (away from the bay-spaces spanned by canopy shelter structure(s)). Optionally, a barrier member is also disposed or mounted on the opposing edge (the outer top side edge) to prevent flow of water freely over the outer edge of the container, in which case it is preferred that the terminal shipping containers are provided with a suitable drainage means and thus a container roof drainage system as defined above. Each shipping container drainage system may have one or more drainage outlets. Optionally, the drainage outlets may lead to a common drainage conduit fed by a plurality of drainage outlets (e.g. from a plurality of container roofs) or may be stored in a common storage vessel for further (grey water) usages. In use, water falling on a canopy shelter structure system (whether comprising a single canopy shelter structure (single bay) or a plurality of canopy shelter structures dispose in parallel with common shipping container support structures (multi-bay)) by way of precipitation will be directed onto the roofs of the shipping containers to which the canopy shelter structure system is mounted. Water accumulating on the roofs of the shipping containers may then drain away via the drainage system installed thereon (e.g. as described above). By mounting the canopy shelter structure on elongate mounting bars that form a sealed barrier along the side of the shipping container, precipitation falling on the canopy shelter or on the shipping container does not flow into the space spanned by the shelter, but is directed elsewhere, thus keeping the spanned space dry and broadening the suitable usages for the spanned / covered space. In a multi-bay system having a medial support container with a canopy shelter extending either side from it, the medial support container having a system for drainage of water therefrom as described above, comprising two opposing barrier members, one on each side of the container roof, the accumulation of water on the container roof from rainfall will be the rain falling on the container roof plus the rain falling on two half canopy roofs. The potential accumulation of water on the roof of a medial container is illustrated, by way of example, in the table below in relation to 20 and 40 foot containers (i.e. 6 m and 12 m length) with a width of 2.4 m and in relation to two arched canopies extending along the full length of the respective containers and having a width of 8, 10 or 12 m. The potential accumulation of water is calculated based upon a rainfall rate of 4 mm, 8 mm and 10 mm over a 1 hour period (data calculated using https: / / water.usgs ,gov / edu / activity-howmuchrain~metric.httn1). Table: Potential water accumulation (litres) for various rainfall rates for specified container / canopy sizes 20ft (6m) long container 40ft (12m) long container Rainfall over Ih (across) / Canopy width (below) 4 mm 8mm 10mm 4mm 8mm 10mm 8m 250 312 624 499 624 1248 10m 298 372 744 595 744 1488 12m 346 432 864 691 864 1728 Dammed volume / L 860 1730 Thus, to enable sufficient drainage to prevent overflowing of the dammed volume, drainage outlets should be selected to have a drainage rate of at least the same as the water accumulation rate that it is required to accommodate once the dammed volume is filled. In the case of a 12 cm2 drainage outlet, having an approximate drainage rate of 410 litres per hour (at full dammed volume), two such outlets would suffice for all but the heaviest exemplified rainfall for the examples given with a 20 foot container and four such outlets would suffice for all but the heaviest exemplified rainfall of a 40 foot container. While any suitable size or number of drainage outlets may be provided according to specific requirements, it is preferred that the system comprises from 2 to 4 drainage outlets (e.g. for a medial container), each having a cross-sectional area of from 8 to 14 cm2, preferably from 10 to 13 cm2. The canopy shelter structure in any of the relevant aspects or embodiments described above may define any suitable shape, which is usually curved and typically an arcuate shape. The shape may define a constant radius or may have a central portion of one shape, or one radius of curvature, and flank portions of another shape or another radius of curvature. Alternatively, the canopy shelter structure may have angularly disposed flat and typically sloping surfaces. For example, the canopy shelter structure may define a central apex formed by two medial canopy portions disposed at a first angle and flanked by two flank portions defining a second angle. In each case, whatever the shape of canopy structure, it should be suitable for mounting on the edge of a shipping container and define a water flow path to the sides of the canopy structure. The canopy shelter structure may be of a length similar to the shipping containers to which they are mounted, although they may optionally be shorter or longer (e.g. overhang). The canopy shelter structure may define any suitable span (to span any suitable width of bay-space). For example, The canopy cover may be of any suitable material and may be flexible or rigid panels or may be a flexible sheet-type cover. Preferably, the canopy cover is a flexible water-resistant membrane which may extend over a skeletal framework to form the canopy shelter structure in a single piece or multiple inter-connected panels. A shipping container-supported canopy shelter structure may be constructed by providing at least one (and preferably at least two) shipping container and disposing the shipping container relative to a second shipping container or a further support structure to define a space to be covered by the canopy shelter structure, providing one or more elongate mounting bars and mounting the mounting bars on a top surface of the shipping container by way of a plurality of mounting elements for securing the mounting bar(s) to an upper edge surface of the shipping container, to form a barrier (preferably a sealed barrier) to the passage of water on the top surface of the shipping container, mounting or constructing a skeletal support framework on to the mounting bars so that the skeletal support forms a span between the two shipping containers, and disposing the canopy cover over the skeletal support framework and securing the same. Preferably, the at least one elongate mounting bar is configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted. In a further aspect of the invention, there is provided a mounting bar, preferably as defined above, for mounting a canopy shelter structure to and for mounting to shipping container via a plurality of mounting elements, the mounting bar configured to form a barrier to passage of water on the top surface of the shipping container and configured to form a seal by way of a resiliently confirmable surface or sealing element on at least one surface thereof. In a further aspect of the invention, there is provided a kit-of-parts for a drainage system for a shipping container, as defined above. In a further aspect of the invention, there is provided a kit-of-parts for a canopy shelter structure or a canopy shelter structure system as defined above. The invention will now be described in more detail, without limitation, with reference to the accompanying Figures. Features common throughout the figures share reference numbers. In Figure 1A, there is illustrated a known shipping container 101, while Figures IB and IC show an upper comer portion of a shipping container 101 (the latter with weld detail). An ISO shipping container 101 is formed of a frame of typically steel components with steel doors and panel members. A frame of four comer posts 103 and, at one end, a header 105 and a sill 107 connect to two comer posts 103 at a top and bottom to form a door-end frame, while at the other end a top end rail 109 and a bottom end rail (not shown) connect to two opposing comer posts 103 at a top and a bottom to form a rear-end frame (this is sometimes called the front-end frame where the rear-end is defined as the doorend). The side framework is formed by top side rail 111 and bottom side rail 113 being connected to upper and lower portions of opposing comer posts 103. Doors 115 are mounted within a front-end frame and a rear panel (not shown) is mounted in the rear-end frame between the comer posts 103 and top end rail 109 and bottom end rail. Side panels are disposed in the space between the comer posts 103, top side rail 111 and bottom side rail 113 and are welded thereto. A roof panel is disposed between and welded to the header 105, top end rail 109 and opposing top side rails 111. The side panel 117 and end panel are typically castellated or cormgated, while the roof panel 119 may be cormgated, flat or ribbed as shown. Ribs 121 extend across the roof panel 119, but not the full width of the roof panel 119. As illustrated in Figure IB, the top end rail 109 is typically raised relative to the roof panel 119 to define a raised or projecting lip 123. The top side rail 111 may be raised relative to the roof panel 119 or at about the same level. Comer castings 125 are disposed at the top of comer posts 103 and abut the ends of the top end rail 109 and top side rail 111 (and also the header 105). The comer castings 125 typically project higher than the roof panel 119 and also higher than the top side rail 111 and the top end rail 109. The comer castings 125 are used for lifting and moving the shipping container 101, but can also be used for supporting attachments. It includes atypically oval-shaped side aperture 127, a typically oval-shaped end aperture 129 and a large square-shaped top aperture 131. Figure IC illustrates the top comer of a container 101 with example weld lines 133 at the junction of the roof panel 119 and each of the top side rail 111 (shown here as level with the roof panel) and the inward facing surface 135 of the comer casting 125. Figure 2 illustrates a shipping container 101 with a side barrier 137 disposed at an upper side edge of the container 101, typically overlying the top side rail 111 at each upper side edge of the container 101. Each side barrier 137 is formed of two elongate mounting bars 139 (more fully illustrated in Figure 4A) in end-to-end elongate abutting alignment held, or sealed, together by a skid joiner 131 (more fully illustrated in Figure 4B). As shown in Figure 4A, the elongate mounting bars 139 comprises a rigid elongate rectangular steel tube 143 having formed on one surface thereof a layer of resiliently compressible rubber-like material and on an opposing or upper surface a plurality of canopy frame-mounting elements 147. At one end on an outside face 149 are two comer clamp fixing holes 151 (for fixing a comer clamp 155 to - see Figure 4D), which are typically threaded, and at the other end is a single joiner fixing hole 153 (for securing a skid joiner 157 to - see figure 4B), which is typically a threaded hole. The elongate mounting bars 139 are clamped onto the upper side edge surface (including, e.g., the top side rail) with resiliently compressible layer 145 in contact with the surface of the container 101 by way of side clamps 159 (see Figure 4C), which have a hook or clip portion 161 with a retaining lip 163 for hooking over the elongate mounting bar 141, atop side rail engaging member 165 for engaging with an underside of a top side rail 111 and an upright linkage element 167 connecting the clip portion 161 and top side rail engaging member 165 to define a generally C-shaped clamp, typically of a rigid material. A threaded hole may be provided in the top side rail engaging member 165 and fitted with a threaded tightening bolt 169 to clamp the elongate mounting bar 139 to the top surface of the container 101 to cause the resiliently conformable layer 145 to conform to the upper surface of the container and form a seal there-against. Skid joiners 157 are fitted overthe join in two end-abutting elongate mounting bars 139 to ensure a seal is formed overthe abutting end and to prevent water leakage through the side barriers 137 at that point. The skid joiner 157, as illustrated in Figure 4C, has an outer plate 171 of generally rectangular shape and a width (or depth) greater than the thickness of the elongate mounting bar 139 (or having a depth-projection to extend the depth of the outer plate 171 to greater than the thickness of the elongate mounting bar 139) and a parallel disposed inner plate 173 of a depth similar to the thickness of the elongate mounting bar 139, the outer and inner plates 171,173 linked by a pair of bridging members 175 separating the outer and inner plates 171,173 by a distance corresponding to, or slightly more than, the width of the elongate mounting bars 139. Opposing inner faces 177 of the outer and inner plates 171,173 are each provided with a resilient joiner layer 179 of resiliently compressible rubber-like material. The skid joiner 157 may be slotted overthe end-abutting elongate mounting bars 139 to fit overthe end abutment and then joiner fixing bolts 181 threaded into joiner fixing holes 153 in the elongate mounting bars 139 via joiner fixing holes 181 formed in each of the inner and outer plates 171,173, causing the resilient joiner layers to form a seal against the inner bar face 183 and outer face 149 of the elongate mounting bar 139 over the end abutment, to thereby inhibit water transgression. A joiner securing member 185 extends orthogonally from a lower edge 187 of the inner plate 173 and is provided with an aperture distal from the inner plate for applying a fixing to the roof of the container, if need be. The skid joiner is a rigid structure of, typically, steel, or any other suitable material. The elongate mounting bars 139 extend along the upper side edge of the shipping container 101 to an extent just shy of the distance between opposing fore and rear inward facing surfaces 189 of the comer castings 125, thus leaving a gap 191 between the inward facing surface 189 of comer casting 125 and a bar-end 193 of the elongate mounting bar 139 (best illustrated in Figure 5 A) through which water from the container roof may flow past the elongate mounting bar 139. To allow the controlled drainage of any water accumulating on the roof of the shipping container via the gap 191, an outlet plate 195 (see Figures 5B and 4 E) may be disposed over the gap extending from the outside facing surface of the elongate mounting bar 139 and the comer casting 125, to ensure that water does not escape or drain from the roof of the container other than through a drainage outlet 197 formed in the outlet plate 195. The outlet plate 195 is ideally positioned to extend across the gap 191 and overlap with the outside facing surface of the elongate mounting bar 139 and the rail facing 211 of the top side rail 111 of the container 101. Preferably, the outlet plate is provided with an inner resiliently conformable layer 199 such that when the outlet plate 195 is secured relative to the elongate mounting bar 139 and rail facing that a seal is formed between them preventing undesired water egress. The outlet plate may be secured via two or more threaded bolts 201 to a suitable receiving thread disposed rigidly relative to the elongate mounting bar 139 and, ideally also, the comer casting 125, such as on a bridging member 203 which may be fitted to extend from the comer casting 125 to an upper portion or upper surface of the elongate mounting bar 195 (without blocking gap 191). Ideally, a seal is also formed to inhibit the egress of water from between the outlet plate 195 and the comer casting 125 and since the comer casting projects outward relative to the outward facing surface of the elongate mounting bar 139 and the rail facing 211 and the side plate 117, this can’t readily be achieved simply by the overlapping a planar outlet plate 195. In this embodiment, there is instead provided an end-member 205 which is configured to project out from the inward-facing surface 135 of the comer casting 125 toward the elongated mounting bar 139 whereby the gap 191 is defined by the space between the end-member 205 (or end-member plate 207 thereon, which is parallel with the inward-facing surface 135) and the bar-end 209 of the elongate mounting bar 139. The outlet plate 195 may therefore be configured to overlap the outer face of the elongate mounting bar 139, the rail facing 211 and the end-member 205, which has a side surface configured to be generally co-planar with the outside surface of the elongate mounting bar 139 and the rail facing 211 so as to prevent passage of water through the gap other than through the drainage outlet 197. The end-member 205 should itself form a seal against both the upper surface of the top side rail 111 and the inward-facing surface 135 of the comer casting 125 and to this effect, in the embodiment illustrated, the endmember 205 has a sealing body 213 of resiliently conformable material disposed behind the end member plate 207 and configured to contact and seal against the inward-facing surface 135 of the comer casting 125 and the upper surface of the top side rail 111. The sealing body 213 should be secured against the inwardfacing surface 135 and the top side rail 111 sufficiently to form and maintain that seal. Preferably a comer clamp 155 is provided which is mountable to a comer casting 125 of the container 101. The comer clamp 155 may then be rigidly supported and secured to the top surface of the comer casting 125 and have projecting from a pivot mount 205 formed thereon a bridging member 203, which may pivot between an engaged configuration in which the bridging member adopts a generally horizontal configuration in which it forms a bridge (over gap 191) between the comer casting 125 and the elongate mounting bar 139 to which it extends and a disengaged configuration in which it is disposed at an angle to the horizontal (e.g. vertical) and does not form a bridge. From a proximal end of the bridging member 203 projecting perpendicularly therefrom is the end-member 205. It is positioned such that when the bridging member 203 is pivoted down into its engaged configuration, the end-member contacts the inward-facing surface 135 of the comer casting 125 and the upper surface of the top side rail 111 and the junction therebetween and such that when the bridging member 203 is secured in place to the elongate mounting bar 139, the sealing body 213 of the end-member 205 is compressed and forms a seal to prevent water egress between the endmember and the inward facing surface 135 or top side rail 111. At a distal end of the bridging member 203 are two laterally disposed normally orientated mounting leaves 217 configured to be parallel with the inner and outer surfaces of the elongate mounting bar 139 and disposed at a separating distance that when the bridging member 203 is in its engaged configuration, abutting or disposed over the elongate mounting bar 139, the mounting leaves 217 fit snugly either side of the elongate mounting bar 139. The mounting leaves 217 are provided with fixing apertures 219 configured to align with comer clamp fixing holes 151 when the bridging member 203 is in engaged configuration enabling the use of fixing bolts 221 fitted through the apertures 210 and holes 151 to secure the bridging member 203 in position. Mounting block 223 that includes a mounting threaded hole may project from the underside of the bridging member 203 for the outlet plate 195 to be mounted to. Figure 3 shows a container 101 fitted with a drainage system including two elongate mounting bars 139 and mounted to the canopy frame mounting elements 147 formed thereon, at each side of the container, a skeletal support structure 225 for a canopy shelter. A canopy cover (not shown) may then be disposed over the skeletal support structure 225 to form a canopy shelter structure. The canopy shelter structure is configured such that the canopy cover directs any rain water, in the event of rain or other precipitation, over the elongate mounting bars 139 onto the roof of the container 101. The water may then be drained from the roof of the container 101 via the drainage system described above to an external drainage system, pund, or the like. Figures 6A and 6B show an end of a shipping container 101 in a canopy shelter structure system 227 having skeletal structure components 229 mounted to comer clamp 155 and (not shown here) to elongate mounting bar 139. A canopy cover 230 extends over the skeletal structure components 229. An outlet plate 195 is shown mounted to bridging member 203 of the comer clamp 155 to cover the gap between the comer casting 125 and elongate mounting bar 139. Fitted to a drainage outlet 197 (not visible here) in the outlet plate 195 is a drainage pipe 231 having an outlet mount 233 for fitting over the drainage outlet 197 and securing thereto (e.g. by friction fit) and a flexible tube 235 for directing the flow of drained water away as desired. In Figure 7, there is illustrated in a simplified front-view illustration a multi-bay canopy shelter structure system 227, which has two terminal shipping containers 237 and a medial shipping container 239 disposed therebetween, the three shipping containers 237,239 arranged in parallel, side-by-side. The shipping containers 237,239, which are illustrated in simplified format not showing the comer castings or any raised lips (e.g. on the fore or rear edges), define therebetween two bay-spaces 241, each of which are spanned by canopy shelter structures 243, which are supported by the respective shipping containers 237,239. The canopy shelter structures 243 are mounted to the shipping containers 237, 239 via elongate mounting bars 139 mounted on near-side edges of the terminal shipping containers 237 (i.e. adjacent the bay-spaces 241) and on both side edges of the medial shipping container 239, which elongate mounting bars 139 extend the length of the shipping containers 237,239 and form a seal on an upper edge surface thereof to prevent water on the top of the shipping containers 237,239 from flowing into the bay-spaces 241. The canopy shelter structures 243 are mounted to the elongate mounting bars 139 in such a way that any water falling as precipitation onto the canopy shelter structures will be directed onto the roofs of the containers 237,239 and may drain from the roofs by suitable drainage means as described elsewhere herein. The invention has been described with reference to a preferred embodiment. However, it will be appreciated that variations and modifications can be effected by a person of ordinary skill in the art without departing from the scope of the invention.

Claims

1. A system for providing drainage from the roof of a shipping container, the system comprising:one or more barrier members for disposing or mounting on the top of a shipping container and arranged to form a barrier to passage of water over one or each side edge thereof; anda drainage means for providing a flow path for water accumulating on the roof of the shipping container.

2. A system as claimed in claim 1, whereinthe one or more barrier members comprise one or more elongate mounting bars for mounting on the top of a shipping container and arranged to form a sealed barrier to water proximal to a side edge thereof;a mounting means for securing the mounting bar(s) to the upper edge surface of the shipping container; anda drainage means for providing a drainage flow path through or by the sealed barrier to a drainage outlet.

3. A system as claimed in claim 2, wherein the elongate mounting bar is arranged to form a seal against the top of the shipping container by way of a layer of resiliently conformable sealing material (e.g. compressed between the elongate mounting bar and a top edge surface of the shipping container).

4. A system as claimed in claim 3, wherein the elongate mounting bar comprises a layer of resiliently conformable sealing material disposed on at least one surface thereof.

5. A system as claimed in any one of claims 1 to 3, wherein the sealed barrier provided by the one or more mounting bars extends along a full length of the shipping container from an inside edge face of first top comer cast to an inside edge of a second, opposing, top comer cast.

6. A system as claimed in claim 5, wherein a gap is provided in the sealed barrier to define the drainage flow path, which gap is covered by an outlet plate having a drainage outlet formed therein.

7. A system as claimed in claim 6, wherein the gap is formed between the elongate mounting bar and a comer casting and a comer clamp is provided, which comer clamp comprises a base plate mounted on the comer casting and a pivotally mounted bridging member being pivotally mounted to the base plate and configured with bridging element for bridging the gap between the elongate mounting bar and the comer casting.

8. A system as claimed in claim 7, wherein the bridging element has a fixing at a distal end thereof for attaching to the elongate mounting bar.

9. A system as claimed in claim 7 or claim 8, wherein the bridging element has a sealing plate at a proximal end thereof having a resiliently conformable surface for forming a seal against an inward facing surface of the comer casting.

10. A system as claimed in claim 7, wherein the outlet plate has a plate member with an inner surface provided with a sealing material or resiliently conformable material so as to form a seal about the perimeter of the gap between the mounting bar and the comer casting.

11. A canopy shelter stmcture system comprising at least one shipping container and mounted thereto a canopy shelter stmcture, the canopy shelter stmcture comprising a skeletal support framework and a canopy cover, the system further comprising at least one barrier member mounted on top of the shipping container and arranged to form a barrier to passage of water over a side edge thereof, and, preferably, a drainage means for providing a dedicated drainage flow path for water accumulating on the roof of the shipping container wherein the skeletal support framework is mounted in relation to the at least one barriermember such that water running off the canopy cover is directed onto the roof of the shipping container inward from the at least one barrier member.

12. A canopy shelter structure system as claimed in claim 11, which further comprises an elongate mounting bar mounted to an upper side edge of the shipping container for mounting the skeletal structure to, which elongate mounting bar serves as the barrier member.

13. A canopy shelter structure system as claimed in claim 11 or claim 12, wherein the at least one elongate mounting bar is configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted.

14. A canopy shelter structure system as claimed in any one of claims 11 to 13, which is configured to provide a multi-bay canopy shelter structure system, the system comprising at least three shipping containers arranged in parallel and separated by at least two bay-spaces and at least two canopy shelter structures mounted to the three shipping containers to span respective bay-spaces.

15. A canopy shelter structure system as claimed in claim 14, wherein the at least three shipping containers comprise two terminal shipping containers and at least one medial shipping container, which at least one medial shipping container is configured with a barrier member, preferably an elongate mounting bar, mounted on each opposing top side edge thereof and which is provided with a drainage means for providing a dedicated drainage flow path for water accumulating on the roof of the medial shipping container.

16. A multi-bay canopy shelter structure system, which comprises at leastthree shipping containers arranged in parallel separated by at least two bay-spaces and at least two canopy shelter structures mounted to the three shipping containers to span respective bay-spaces, wherein at least one of the shipping containers isprovided with a shipping container roof drainage system as defined in any one of claims 1 to 10.

17. A method of construction of a shipping container-supported canopy shelter structure, the method comprising:providing at least one shipping container and disposing the shipping container relative to a second shipping container or a further support structure to define a space to be covered by the canopy shelter structure;providing one or more barrier members, preferably elongate mounting bars, and mounting the barrier members on a top surface of the shipping container (e.g. by way of a plurality of mounting elements for securing the barrier members or mounting bar(s) to an upper edge surface of the shipping container), to form a barrier (preferably a sealed barrier) to the passage of water on the top surface of the shipping container;mounting or constructing a skeletal support framework on to the barrier members so that the skeletal support framework forms a span between the two shipping containers or between the shipping container and the further support structure; anddisposing the canopy cover over the skeletal support framework and securing the same.

18. A method as claimed in claim 17, wherein the at least one elongate mounting bar is configured to form a sealed barrier (e.g. by way of a resiliently conformable surface) to water proximal to a side edge of the shipping container to which it is mounted.

19. A mounting bar for mounting a canopy shelter structure to and for mounting to shipping container via a plurality of mounting elements, the mounting bar configured to form a barrier to passage of water on the top surface of the shipping container and configured to form a seal by way of a resiliently confirmable surface or sealing element on at least one surface thereof.20 A shipping container configured with a roof drainage system as defined inany one of claims 1 to 10.

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