Flooding detection unit

Abstract

To provide a flooding detection unit that can detect flooding at low cost.SOLUTION: A flooding detection unit 1 includes a sensor unit 2 having a flooding meter 11 and a bracket 12 that holds the flooding meter 11. The sensor unit 2 is installed on a step surface 52b formed at a step between a roadway 50 and a sidewalk 51.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a flood detection unit. [Background technology]

[0002] For example, Patent Document 1 discloses a technology in which a water level meter is incorporated into a curbstone installed at the boundary between the sidewalk and the roadway. This technology makes it possible to detect flooding or inundation of the road. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-509454 Summary of the Invention [Problem to be solved by the invention]

[0004] This technology incorporates a water level gauge into the curb itself, so installing the new curb requires work such as removing the existing curb that is already installed on the road, which means that installing a curb with a built-in water level gauge is costly.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a flood detection unit that can detect flooding at low cost. [Means for solving the problem]

[0006] A flood detection unit according to one aspect of the present invention comprises a sensor unit having a flood meter and a bracket for holding the flood meter, and the sensor unit is installed on a step surface formed at a step between a roadway and a sidewalk. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a flood detection unit that can detect flooding at low cost. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view seen from the front side, schematically illustrating the structure of a sensor unit 2 that constitutes a submergence detection unit 1 of the present invention. [Figure 2] 1 is a perspective view seen from the back, schematically illustrating the structure of a sensor unit 2 that constitutes a submergence detection unit 1 of the present invention. [Figure 3] 1 is a perspective view seen from above, schematically showing the structure of a wireless unit 3 that constitutes a submergence detection unit 1 of the present invention. [Figure 4] 1 is a perspective view seen from below, schematically showing the structure of a wireless unit 3 that constitutes a submergence detection unit 1 of the present invention. [Figure 5] FIG. 2 is a perspective view showing a wireless unit 3 according to a specific example in an unfolded state. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3. [Figure 7] 1 is a perspective view illustrating a usage mode of a submergence detection unit 1 according to an embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. [Figure 9] FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8. [Figure 10] 9 is a cross-sectional view corresponding to FIG. 8 and illustrating another mode of use of the submergence detection unit 1. FIG. [Figure 11] 9 is a cross-sectional view corresponding to FIG. 8 and illustrating yet another mode of use of the submergence detection unit 1. FIG. [Figure 12] 9 is a cross-sectional view corresponding to FIG. 8 and illustrating yet another mode of use of the submergence detection unit 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will now be described with reference to the accompanying drawings. Fig. 1 is a perspective view from the front side, schematically illustrating the structure of a sensor unit 2 that constitutes a flood detection unit 1 of the present invention. Fig. 2 is a perspective view from the back side, schematically illustrating the structure of the sensor unit 2. As will be described later, the flood detection unit 1 is installed between a roadway and a sidewalk, and is configured to detect flooding of the roadway. Referring to Figs. 1 and 2 together, the sensor unit 2 according to one specific example has a bracket 10 having, for example, a flat rectangular parallelepiped outer shape, and one or more flood gauges 11 held by the bracket 10.

[0010] The bracket 10 has a flat front panel 12, an upper panel 13 bent from the upper edge of the front panel 12, and a pair of side panels 14, 14 bent from a pair of side edges of the front panel 12. In this example, the front panel 12, the upper panel 13, and the pair of side panels 14, 14 form a roughly rectangular storage space S1. No lower panel is formed at the lower edge of the front panel 12. Furthermore, the bracket 10 does not have a rear panel corresponding to the front panel 12. As a result, the lower and rear surfaces of the storage space S1 are open. In this example, the upper panel 13 intersects with the front panel 12 at an angle of approximately 90 degrees. Similarly, the pair of side panels 14, 14 intersect with the front panel 12 and the upper panel 13 at an angle of approximately 90 degrees.

[0011] The side plates 14, 14 connected to the front plate 12 each have a rear end, opposite the front end, formed with protruding pieces 15, 15 that protrude away from each other. In this example, the protruding pieces 15, 15 are defined parallel to the front plate 12. Each protruding piece 15 is formed over the entire length of the rear end of the side plate 14. One or more holes 15a are formed in each protruding piece 15. In this example, five holes 15a are formed in the longitudinal direction of the side plate 14. Each hole 15a is an elongated hole that is long in the longitudinal direction. The holes 15a are holes for passing through anchor bolts or other fixing members (not shown) for attaching the bracket 10, i.e., the sensor unit 2, to an object to be attached.

[0012] The front plate 12 has one or more slits 16, 16 in this example, extending in the height direction of the bracket 10 along the side plates 14. In this example, the slits 16, 16 are defined, for example, parallel to the side plates 14, 14, respectively. Each slit 16 penetrates the front plate 12. The slits 16 extend, for example, from a position adjacent to the upper end of the front plate 12 to a position adjacent to the lower end. Scales 17 are formed on the surface of the front plate 12 adjacent to each slit 16 in the height direction of the bracket 10. The scales 17 have markings at intervals of, for example, 5 mm.

[0013] One or more flood gauges 11, 11 in this example, are attached to the back surface of the front plate 12. Each flood gauge 11 has a main body 18 having, for example, a rectangular parallelepiped outer shape, and a pair of support pieces 19, 19 extending upward and downward from the main body 18. Each flood gauge 11 is attached using fixing members 20 such as bolts and nuts that pass through slits 16 in the front plate 12 and are attached to each support piece 19. In this way, the flood gauges 11 are attached to the slits 16 in a manner that allows their heights to be adjusted. In this example, one flood gauge 11 is positioned adjacent to the lower end of one of the slits 16, and the other flood gauge 11 is positioned adjacent to the upper end of the other slit 16. In this way, one flood gauge 11 and the other flood gauge 11 are positioned at different heights.

[0014] The flooding gauge 11 has, for example, a float (not shown) arranged within the main body 18. Water that has entered the main body 18 of the flooding gauge 11 causes the float to float, which turns on a magnetic switch (not shown) housed within the main body 18. In this way, the flooding gauge 11 can detect when flooding has reached a predetermined height. Note that other types of flooding gauges may also be used. In each flooding gauge 11, wiring 21 extends outward from the upper end of the main body 18. Each wiring 21 is drawn out into the external space outside the bracket 10 through a hole 22 formed in the upper plate 13. The wiring 21 is connected to a wireless unit, which will be described later. Note that a bushing 23 made of, for example, an elastic material, may be fitted into the hole 22.

[0015] Two holes 24, 24 are formed in the front plate 12 adjacent to the upper end of the front plate 12 (see FIG. 1). Each hole 24 penetrates the front plate 12. A binding member 25, such as a cable tie, is passed through the holes 24, 24. The binding member 25 is used to bind the wiring 21, 21 of the flood gauges 11, 11 on the back side of the front plate 12. In addition, a pair of recesses 26, 26 are formed in the top plate 13, positioned on both sides of the hole 22 in the width direction of the bracket 10, which is defined along the top plate 13 between the side plates 14, 14. Each recess 26 is formed in a concave shape extending from the rear end to the front end of the top plate 13. Each recess 26 is formed in a roughly semicircular shape, for example, when viewed in a plan view along the height direction. The bracket 10 is formed, for example, from a metal material.

[0016] FIG. 3 is a perspective view from above, schematically illustrating the structure of the wireless unit 3 that constitutes the submergence detection unit 1 of the present invention. FIG. 4 is a perspective view from below, schematically illustrating the structure of the wireless unit 3. Referring to both FIGS. 3 and 4, the wireless unit 3 has a housing 30 having, for example, a rectangular parallelepiped outer shape, and a wireless box 31 housed in the housing 30. The housing 30 has a top panel 32, a front panel 33, a rear panel 34, and a pair of side panels 35, 35. The top panel 32, the front panel 33, the rear panel 34, and the side panels 35 form a roughly rectangular parallelepiped storage space S2. The housing 30 does not have a panel corresponding to the top panel 32. Therefore, the bottom surface of the storage space S2 is open.

[0017] In the housing 30, a notch 32a is formed at the front end of the top plate 32 on the front plate 33 side. In addition, a notch 33a is formed at the upper end of the front plate 33 on the top plate 32 side. In this example, the notches 32a and 33a are formed, for example, in a rectangular shape when viewed from the front. The notch 32a exposes, for example, a portion of the top surface of the radio box 31. The notch 33a exposes, for example, the front surface of the radio box 31. In the width direction of the housing 30, which is defined along the top plate 32 between the pair of side plates 35, 35, the length of the notch 33a is set to be longer than the length of the notch 32a. In this example, the width direction length of the notch 33a matches the width direction length of the radio box 31, which is similarly defined.

[0018] On the lower ends of the side plates 35, 35 opposite the upper ends of the side plates 35, 35 connected to the top plate 32, protruding pieces 36, 36 protruding in directions away from each other are formed. In this example, the protruding pieces 36, 36 are defined parallel to the top plate 32. Each protruding piece 36 is formed over part of the entire length of the lower end of the side plate 35. Each protruding piece 36 has one or more holes 36a formed in the length direction defined between the front plate 33 and the rear plate 34. In this example, three holes 36a are formed in the length direction. Each hole 36a is an elongated hole that is long in the length direction. The holes 36a are holes for passing through anchor bolts or other fixing members (not shown) for attaching the housing 30, i.e., the wireless unit 3, to an attachment target.

[0019] FIG. 5 is a perspective view showing a wireless unit 3 according to one specific example in an unfolded state. Referring to FIGS. 3 and 5 together, the wireless box 31 is attached to the top plate 32 by fastening members 37, such as two bolts. The top plate 32 is attached to an inner plate 39, which supports the top plate 32 when the wireless unit 3 is unfolded, by fastening members 38, such as two bolts. The front plate 33, rear plate 34, and pair of side plates 35, 35 bend from the four sides of the inner plate 39. The top plate 32, together with the wireless box 31, can swing relative to the rear plate 34 around an axis adjacent to the rear end of the top plate 32. In this way, the top plate 32 can swing between a closed position (FIG. 3) in which the storage space S2 is closed and an open position (FIG. 5) in which the storage space S2 is opened.

[0020] As shown in FIG. 5 , the inner plate 39 has a recess 39a that matches the outline of the radio box 31 in a plan view. Meanwhile, two support plates 40, 40, for example, are formed at the lower end of the notch 33a in the front plate 33, protruding toward the rear plate 34. The support plates 40, 40 are defined to be generally parallel to the top plate 32 when the closed position is established, for example. The support plates 40, 40 can support the underside of the radio box 31 when the closed position is established. Three pairs of holes 41, 41 are formed in the top plate 32 adjacent to the rear end of the top plate 32. Each hole 41 penetrates the top plate 32. A binding member (not shown), such as a cable tie, is passed through each pair of holes 41, 41. The binding member is used to bind the wiring 21, 21 of the flood gauges 11, 11 on the underside of the top plate 32. The housing 30 is formed, for example, from a metal material.

[0021] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3. As shown in FIG. 6, the wireless box 31 has a case 42 having, for example, a flat rectangular parallelepiped shape. The case 42 houses a circuit board 43 on which a wireless communication circuit is mounted, an antenna 44 connected to the circuit board 43, and a battery 45, such as a dry cell battery, for supplying power to the circuit board 43. The flooding meter 11 of the sensor unit 2 is connected to the circuit board 43 via the aforementioned wiring 21. The antenna 44 is, for example, a film antenna. The wireless communication circuit can transmit information about flooding detected by the flooding meter 11 to an external device or the like via wireless communication. The case 42 is waterproof to prevent liquids, such as water, from entering the storage space of the case 42.

[0022] The antenna 44 is disposed adjacent to the front surface of the radio box 31, for example. As described above, the front surface of the radio box 31 is exposed within the notch 33a in the front plate 33 of the housing 30. Furthermore, a portion of the upper surface of the radio box 31 is exposed within the notch 32a in the top plate 32 of the housing 30. In other words, no components of the housing 30 are disposed in the area where the antenna 44 of the radio box 31 is housed. With this configuration, interference of radio waves emitted from the antenna 44 to the external space can be suppressed. Note that, as is clear from FIG. 6 , a predetermined gap G is formed between the rear surface of the radio box 31 and the rear plate 34 of the housing 30. This gap G can be used as a space for arranging the sensor unit 2, as will be described later.

[0023] FIG. 7 is a perspective view illustrating a usage mode of a submergence detection unit 1 according to one embodiment of the present invention. As shown in FIG. 7, the submergence detection unit 1 is installed, for example, between a roadway 50 and a sidewalk 51 of a public road. In this example, the sensor unit 2 is installed on a curb 52 that forms part of the sidewalk 51. The curb 52 extends along the boundary between the roadway 50 and the sidewalk 51. In this example, the wireless unit 3 is installed on an upper surface 52a of the curb 52, and the sensor unit 2 is installed on a step surface 52b (i.e., a side surface of the curb 52) between the upper surface 52a of the curb 52 and a surface 50a of the roadway 50. The sensor unit 2 and the wireless unit 3 are fixed to the upper surface 52a and the step surface 52b, respectively, by fixing members (not shown), such as anchor bolts.

[0024] 8 is a cross-sectional view taken along line 8-8 in FIG. 7. As shown in FIG. 8, in this example, the surface 51a of the sidewalk 51 coincides with the upper surface 52a of the curbstone 52. The front panel 12 of the sensor unit 2 faces the roadway 50. That is, the front panel 12, the upper panel 13, the side panels 14, 14, and the step surface 52b define the accommodation space S1. Meanwhile, in the wireless unit 3, the front panel 33 faces the sidewalk 51, and the rear panel 34 faces the roadway 50. In this example, the front panel 33 of the wireless unit 3 is disposed on the surface 51a of the sidewalk 51. Furthermore, the rear panel 34 of the wireless unit 3 protrudes toward the roadway 50 from the end of the upper surface 52a of the curbstone 52 that faces the roadway 50.

[0025] As is clear from FIG. 8 , in this example, the step surface 52b is inclined at a predetermined angle relative to the upper surface 52a. That is, the step surface 52b is formed of a surface that slopes toward the roadway 50 as it moves from the surface 51a of the sidewalk 51 toward the surface 50a of the roadway 50. Therefore, the sensor unit 2 is connected to the wireless unit 3 in an inclined position. Also, in this example, the height H from the surface 50a of the roadway 50 to the upper surface 52a of the curb 52 is set to, for example, about 100 mm. This height H is smaller than the height of the sensor unit 2. Therefore, the upper end of the sensor unit 2 is positioned above the surface 51a of the sidewalk 51. In this way, a portion of the sensor unit 2 is accommodated within the accommodation space S2 (including the gap G) of the housing 30 of the wireless unit 3. In this way, in the submergence detection unit 1, the height position of the sensor unit 2 relative to the wireless unit 3 is adjustable.

[0026] 9 is a cross-sectional view taken along line 9-9 in FIG. 8. Referring to both FIGS. 8 and 9, in this example, the upper end of the sensor unit 2 is housed within the housing 30 (gap G) up to a position adjacent to the top plate 32 of the housing 30 of the wireless unit 3. In this state, the two recesses 26, 26 formed in the top plate 13 of the bracket 10 of the sensor unit 2 respectively receive the protrusions 42a, 42a protruding from the rear end of the case 42 of the wireless box 31. The wiring 21 of the sensor unit 2 passes through the hole 22 and recesses 26 of the top plate 13 and extends from the protrusion 42a into the case 42. In this way, the recesses 26, 26 of the top plate 13 of the bracket 10 function as a space for arranging the protrusion 42a and the wiring 21.

[0027] Here, let us assume that water has entered the roadway 50 due to, for example, a sudden downpour or a typhoon causing a river to overflow. As the water level rises from the surface 50a of the roadway 50, water enters the bracket 10 from its lower end. When the water level rises to the lower flooding gauge 11 located adjacent to the lower end of one of the slits 16 in the front panel 12 of the bracket 10, the lower flooding gauge 11 detects that the water level has risen to a predetermined height from the surface 50a of the roadway 50 due to the rise in the float caused by the rise in the water level. In other words, the lower flooding gauge 11 detects that flooding has begun in the roadway 50. The detected information is transmitted to an external device or the like via wireless communication from the wireless unit 3.

[0028] When the water level rises to the higher flood gauge 11 located adjacent to the upper end of the other slit 16 in the front panel 12, the higher flood gauge 11 detects a further rise in the water level due to the rise in the float caused by the rise in the water level. In this example, the higher flood gauge 11 is located higher than the surface 51a of the sidewalk 51, as shown in FIG. 8, so the higher flood gauge 11 detects that flooding of the sidewalk 51 has begun. The detected information is transmitted to an external device via wireless communication by the wireless unit 3. In this embodiment, the sensor unit 2 has two flood gauges 11 at different heights, so it can detect a flooding situation in two stages: the start of flooding and the rise in the flood level.

[0029] With the submergence detection unit 1 described above, to detect submergence, the sensor unit 2 is installed on the step surface 52b of the curb 52 using a fixing member such as an anchor bolt. Similarly, the wireless unit 3 is installed on the top surface 52a of the curb 52 using a fixing member such as an anchor bolt. No work is required on the curb 52 itself to install these. Furthermore, the sensor unit 2 and the wireless unit 3 are only connected to each other by wiring 21, and there is no need for the sensor unit 2 and the wireless unit 3 to be mechanically coupled to each other. In this way, the structure of the submergence detection unit 1 can be simplified. Therefore, the submergence detection unit 1 can detect submergence at low cost.

[0030] FIG. 10 corresponds to FIG. 8 and is a cross-sectional view illustrating another mode of use of the submergence detection unit 1. In this example, the submergence detection unit 1 is installed on a curb 52 having a height H greater than the height H of the curb 52 in FIG. 8. Specifically, the height H from the surface 50a of the roadway 50 to the upper surface 52a of the curb 52 is set to, for example, 200 mm. The angle of inclination of the step surface 52b of the curb 52 is the same as that in the above-described embodiment. In this example, the sensor unit 2 has a height approximately equal to the height H. Therefore, the sensor unit 2 is positioned approximately outside the wireless unit 3. Because the sensor unit 2 is not coupled to the wireless unit 3, the submergence detection unit 1 can also be installed on such a curb 52.

[0031] FIG. 11 corresponds to FIG. 8 and is a cross-sectional view illustrating yet another mode of use of the submergence detection unit 1. In this example, the curbstone 52 has the same height H as the curbstone 52 in FIG. 8, but its step surface 52b is perpendicular to the upper surface 52a. That is, the step surface 52b stands upright in a substantially vertical direction from the surface 50a of the roadway 50. In this installation situation, the front panel 12 of the sensor unit 2 is set substantially parallel to, for example, the rear panel 34 of the housing 30 of the wireless unit 3. In this example, a portion of the sensor unit 2 is housed within the housing 30 of the wireless unit 3, as in the case of FIG. 8. In this way, the angular position of the sensor unit 2 relative to the wireless unit 3 can be adjusted. Furthermore, because the sensor unit 2 and the wireless unit 3 are not coupled, the submergence detection unit 1 can also be installed on such a curbstone 52.

[0032] FIG. 12 corresponds to FIG. 8 and is a cross-sectional view illustrating yet another mode of use of the submergence detection unit 1. In this example, the curbstone 52 has the same height H as the curbstone 52 in FIG. 10, but its step surface 52b is perpendicular to the upper surface 52a. That is, the step surface 52b stands upright in a substantially vertical direction from the surface 50a of the roadway 50. In this installation situation, the front panel 12 of the sensor unit 2 is defined to be substantially parallel to, for example, the rear panel 34 of the housing 30 of the wireless unit 3. In this example, a portion of the sensor unit 2 is housed within the housing 30 of the wireless unit 3, as in the case of FIG. 11. Because the sensor unit 2 and the wireless unit 3 are not coupled, the submergence detection unit 1 can also be installed on such a curbstone 52.

[0033] In the flood detection unit 1 as described above, two flood gauges 11, 11 are installed at different heights, but for example, one water level gauge may be installed instead of the two flood gauges 11, 11. The water level gauge may be configured to measure the water level up to the height of the bracket 10, for example. Such a water level gauge makes it possible to continuously detect a rise in water level due to flooding. Also, for example, one flood gauge 11 or three flood gauges 11, 11, 11 may be installed instead of the two flood gauges 11, 11. For example, one flood gauge 11 may be attached to the bracket 10 at a height that allows flooding onto the sidewalk 51 side to be detected. For example, three flood gauges 11 may be attached to the bracket 10 at different heights from each other.

[0034] Furthermore, although the flood detection unit 1 is installed on the curbstone 52 between the sidewalk 51 and the roadway 50, it may also be installed on other types of step surfaces. For example, it may be installed on a step surface where the sidewalk 51 and the roadway 50 are directly connected without the curbstone 52 in between. Even if the surface 51a of the sidewalk 51 is at the same height as the surface 50a of the roadway 50 and only the curbstone 52 protrudes, the flood detection unit 1 may be installed on the curbstone 52. The flood detection unit 1 may be installed not only on ordinary roads, but also in any location that has a step surface. Such locations include, for example, farmland such as fields and rice paddies, parks, underground facilities and roads, and underpasses of multi-level intersections.

[0035] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0036] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. Furthermore, the above-described embodiments do not limit the scope of the present invention, and the present invention may include any and all applications. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shape, and size, are not limited to those illustrated and may be modified as appropriate. For example, the present invention includes variations that arise during implementation due to manufacturing tolerances, etc. Furthermore, components illustrated in different embodiments may be partially substituted or combined within the scope of technical inconsistency. Furthermore, the various configurations may be selectively combined as appropriate to achieve at least some of the aforementioned problems and effects. [Explanation of symbols]

[0037] 1. Flood detection unit, 2. Sensor unit, 3. Wireless unit, 10. Bracket, 11 flood gauge, 12 front plate, 13 upper plate, 13a hole, 14 side plate, 15 protruding piece, 15a hole, 16 slit, 18 main body, 19 support piece, 20 fixing member, 21 wiring, 22 hole, 23 bush, 24 hole, 25 binding member, 26 recess, 30 housing, 31 radio box, 32 top plate, 33 front plate, 34 rear plate, 35 side plate, 36 protruding piece, 36a hole, 37 fixing member, 38 fixing member, 39 inner plate, 39a recess, 40 support plate, 41 hole, 42 case, 42a protruding portion, 43 circuit board, 44 antenna, 45 battery, 50 roadway, 50a surface, 51 sidewalk, 51a surface, 52 curb, 52a top surface, 52b Step surface, G gap, S1 storage space, S2 storage space

Claims

1. A sensor unit having a flood meter and a bracket for holding the flood meter, The sensor unit is a flood detection unit that is installed on a step surface formed at a step between a roadway and a sidewalk.

2. The bracket has a slit extending in a height direction, The flood detection unit according to claim 1 , wherein the flood gauge is attached to the slit so as to be height-adjustable.

3. the submergence meter includes a first submergence meter and a second submergence meter, and the slit includes a first slit and a second slit; the first submergence meter is attached to the first slit in a height-adjustable manner, The flood detection unit according to claim 2 , wherein the second flood gauge is attached to the second slit so as to be height-adjustable.

4. 4. The flood detection unit according to claim 3, wherein the first flood gauge is held at a different height than the second flood gauge.

5. The flood detection unit according to claim 1 , further comprising a wireless unit capable of transmitting information from the flood meter to an external device.

6. The flood detection unit according to claim 5 , wherein the wireless unit is installed on an upper surface of a curbstone located at an edge of the sidewalk on the roadway side.

7. 7. The submergence detection unit according to claim 5, wherein the wireless unit comprises a wireless box for wireless communication and a housing for accommodating the wireless box.

8. The flood detection unit according to claim 7 , wherein the housing has a notch at a position corresponding to an antenna in the wireless box.

9. The flood detection unit according to claim 7 , wherein the housing protrudes toward the roadway beyond the step surface and accommodates a portion of the bracket.

10. The flood detection unit according to claim 9 , wherein the height position of the bracket relative to the housing is adjustable.

11. The flood detection unit according to claim 9, wherein the angular position of the bracket relative to the housing is adjustable.

12. The flood detection unit according to claim 1 , wherein the step surface is defined by a side surface of a curbstone disposed on the edge of the sidewalk on the roadway side.

13. The flood detection unit according to claim 1 , wherein the flood meter is a water level meter.

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