Overflow adjustable storage and reuse multi-stage pump station water delivery system

Abstract

The application provides a multi-stage pump station water delivery system with adjustable water storage and reuse, which stores overflow water between pump stations in a regulating reservoir built beside a water delivery channel, effectively stores overflow water in the channel when the pump station is shut down, saves water resources, reduces comprehensive energy consumption of the pump station, loss of surrounding residents, and operation cost of the pump station, reduces secondary disasters, and reversely pumps water in the regulating reservoir back into the channel after the accident to achieve the purpose of efficient use of water resources, and the regulating reservoir can also store water in advance to play a role of local regulation during irrigation peak period.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, and more specifically to a multi-stage pumping station water conveyance system for the regulation, storage and reuse of overflow water. Background Technology

[0002] A cascade pumping station water conveyance system connects multiple pumping stations with different heads in series along a water conveyance line, forming a pumping station chain to achieve the purpose of lifting water in stages. These projects are characterized by large flow rates, high heads, and significant topographical variations along the route. The construction of large-scale cascade pumping stations in Northwest my country has effectively improved the living conditions of local residents, while also developing artificial irrigation and expanding the planting area of ​​crops, making a significant contribution to local economic development.

[0003] However, any one or even multiple pumping stations may inevitably experience shutdown accidents due to factors such as overload, high flow rate, high water level operation, and instability of the external power supply system. In such cases, all the water in the upstream channel and part of the water in the downstream channel will be released from the pumping station in front of the accident site. Due to the limitations of the initial construction conditions, the overflow weirs of the pumping stations are mostly set in natural ditches, which prevents them from playing an overflow prevention role. As a result, the overflow water destroys houses, farmland, and ground attachments on both sides of the ditch, causing serious secondary disasters downstream and resulting in a serious waste of water and electricity resources. In particular, if the pumping station at the end of the water conveyance canal experiences an accidental shutdown, the original water flow from the head pumping station will continue to advance, causing the water level in the forebay of the head pumping station to rise sharply. At the same time, the water body will generate violent hydraulic oscillations in the water conveyance system, threatening the safety of the pumping station building, units, and water conveyance canals. Summary of the Invention

[0004] The purpose of this invention is to address the problem of water overflow caused by pump station shutdowns due to accidents in existing cascade pumping station water conveyance systems. It provides a multi-stage pumping station water conveyance system with adjustable and reusable overflow. By constructing a regulating reservoir alongside the water conveyance channel, the overflow water generated by pump station accidents can be stored in the reservoir. This effectively stores the overflow water during pump station shutdowns, conserving water resources, reducing overall energy consumption of the pumping station, losses to surrounding residents, and pumping station operating costs, while also minimizing secondary disasters. After the accident, the water in the regulating reservoir can be pumped back into the channel for efficient water resource utilization. During peak irrigation periods, water can also be stored in advance for localized regulation.

[0005] According to a first aspect of the present invention, a multi-stage pumping station water conveyance system for the regulation, storage and reuse of overflow water is provided, comprising multiple first pumping stations with different heads, the first pumping stations being connected in series via a water conveyance channel, the first pumping stations connected in series exhibiting an elevation difference from low to high along the direction from low water level to high water level, thereby forming a multi-stage pumping station water conveyance system; wherein, between two adjacent pumping stations, the pumping station with the lower elevation is defined as the low water level pumping station, and the pumping station with the higher elevation is defined as the high water level pumping station;

[0006] In each pumping station, the first end of the water conveyance channel is connected to the outlet pool of the low-water-level pumping station, and the second end of the water conveyance channel is connected to the inlet pool of the high-water-level pumping station. With the horizon as the X-axis, the position of the first end of the water conveyance channel is higher than the position of the second end in the Y-axis direction, so that an elevation difference is formed between the first end and the second end of the water conveyance channel. Water is transported from the outlet pool of the low-water-level pumping station to the water conveyance channel through pressurized pipelines and flows into the inlet pool of the high-water-level pumping station by gravity.

[0007] In this system, at least one overflow weir is installed at each location on the water conveyance channel where overflow is likely to occur. The overflow weir is connected to a regulating reservoir located below the overflow weir. A water conveyance channel is provided between the regulating reservoir and the water conveyance channel. The volume of the regulating reservoir is designed according to the actual overflow flow.

[0008] When an overflow occurs due to an accident at the pumping station, the water overflowing from the water conveyance channel flows into the regulating reservoir through the overflow weir, thus storing the overflow water. After the overflow ends and the pumping station resumes normal operation, the water in the regulating reservoir re-enters the water conveyance channel through the water conveyance passage, thus reusing the overflow water.

[0009] In an optional implementation, the volume of the regulating reservoir is calculated according to formula (1):

[0010] (1)

[0011] Where V is the volume of the regulating reservoir, m 3 L is the projected length of the water conveyance channel connecting two adjacent pumping stations in the horizontal direction, m; b is the bottom width of the water conveyance channel, m; m is the slope coefficient; h is the water level in the water conveyance channel when the first pumping station is operating normally, m; h0 is the elevation difference between the first and second ends of this section of the water conveyance channel, m; h1 is the height of the overflow weir, m.

[0012] In an optional embodiment, the second end of the water conveyance channel is configured as a gradually widening water intake channel until it connects with the inlet forebay of the high-water-level pumping station.

[0013] In an optional implementation, the water conveyance channel is connected to the water conveyance canal at an angle, the angle of which can be determined according to the engineering layout.

[0014] In an optional embodiment, a second pumping station is provided on the water conveyance channel to pump water from the storage tank back into the water conveyance channel.

[0015] In an optional embodiment, the water conveyance channel is configured as a trapezoidal channel with a bottom width smaller than the opening width.

[0016] In an optional implementation, the height of the water conveyance channel is higher than the water level in the water conveyance channel when the first pumping station is operating normally.

[0017] In an optional implementation, the regulating reservoir is arranged in an open-air manner, and its shape is determined according to the size of the site, topography, geology and other conditions.

[0018] In an optional implementation, the location and number of the first pumping stations are determined based on the elevation between the low-water-level outlet and the high-water-level inlet, the terrain conditions, and the pumping station head.

[0019] Compared with the prior art, the significant advantages of the present invention are as follows:

[0020] 1. The multi-stage pumping station water conveyance system of the present invention, which allows for the regulation and reuse of overflow water, stores the overflow water between each pumping station by constructing a regulating reservoir next to the water conveyance channel. This effectively stores the overflow water in the channel when the pumping station is shut down, saving water resources, reducing the overall energy consumption of the pumping station, the losses of surrounding residents, and the operating costs of the pumping station, and reducing secondary disasters. After the accident, the water in the regulating reservoir can be pumped back into the channel to achieve the purpose of efficient utilization of water resources. During the peak irrigation period, water can also be stored in advance to play a role in local regulation and storage.

[0021] 2. The multi-stage pumping station water conveyance system of the present invention, which allows for the regulation and reuse of overflow, has a storage tank volume designed according to the actual overflow flow to ensure effective overflow prevention and provide theoretical guidance for the construction of storage tanks, thereby reducing manpower and material costs.

[0022] 3. The overflow storage and reuse multi-stage pumping station water conveyance system of the present invention allows the storage tank to store water in advance during the peak irrigation period, so that irrigation is not limited by the pumping time, which is conducive to the development of efficient water-saving agriculture such as micro-irrigation, sprinkler irrigation, and drip irrigation, and can also play a role in local regulation and storage.

[0023] 4. The multi-stage pumping station water conveyance system of the present invention, which allows for the regulation, storage and reuse of overflow water, can extract and store the remaining water in the water conveyance channel during the winter water outage period of the pumping station, thus protecting the water conveyance channel from damage caused by freezing and swelling of the water in the channel.

[0024] 5. The overflow storage and reuse multi-stage pumping station water conveyance system of the present invention is suitable for multi-stage, long-distance, high-lift pumping stations and has a positive effect on the regulation and storage of their overflow. Attached Figure Description

[0025] Figure 1 This is a plan view of one of the first-stage pumping stations in the multi-stage pumping station water conveyance system of the present invention, which allows for the regulation, storage, and reuse of overflow water.

[0026] Figure 2 This is a cross-sectional view of one of the first-stage pumping stations in the multi-stage pumping station water conveyance system of the present invention, which allows for the regulation, storage, and reuse of overflow water.

[0027] Figure 3 This is a simplified side-view calculation diagram of the storage tank capacity when the elevation difference of the pumping station is not less than the height of the overflow weir in this invention.

[0028] Figure 4 This is a schematic diagram of the water conveyance channel capacity below the overflow weir elevation when the elevation difference of the pumping station is not less than the overflow weir height in this invention.

[0029] Figure 5 This is a simplified side-view calculation diagram of the storage tank capacity when the elevation difference of the pumping station is less than the height of the overflow weir in this invention.

[0030] Figure 6 This is a plan view of the water conveyance channel capacity below the overflow weir elevation when the elevation difference of the pumping station is less than the overflow weir height in this invention. Detailed Implementation

[0031] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0032] Various aspects of the invention are described in this disclosure with reference to the accompanying drawings, in which numerous illustrative embodiments are shown. The embodiments of this disclosure are not necessarily intended to encompass all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of a number of ways.

[0033] In water conservancy and hydropower projects, the problem of overflow water recovery and reuse after pump station shutdown due to accidents must be solved. Therefore, considering the characteristics of high head and high energy consumption of pump station projects in Northwest China, this invention proposes a multi-stage pump station water conveyance system with adjustable and reusable overflow. By constructing a regulating reservoir next to the channel, the overflow water between each pump station is stored in the regulating reservoir. The combination of channel and regulating reservoir effectively stores the overflow water, saves water resources, reduces energy consumption, secondary disasters, and economic losses during the pumping process, and achieves the goal of efficient water resource utilization.

[0034] Combination Figure 1 , Figure 2As shown, in one preferred embodiment of the present invention, a multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water is provided, including multiple first pumping stations with different heads. The first pumping stations are connected in series through a water conveyance channel 1. The first pumping stations connected in series present an elevation difference from low to high along the direction from low water level to high water level, thereby forming a cascade pumping station water conveyance system. Among them, between two adjacent pumping stations, the pumping station with the lower elevation is defined as the low water level pumping station, and the pumping station with the higher elevation is defined as the high water level pumping station.

[0035] In each pumping station, the first end of the water conveyance channel 1 is connected to the outlet pool of the low-water-level pumping station, and the second end of the water conveyance channel 1 is connected to the inlet pool 2 of the high-water-level pumping station. With the horizon as the X-axis direction, the position of the first end of the water conveyance channel is higher than the position of the second end in the Y-axis direction, so that an elevation difference is formed between the first end and the second end of the water conveyance channel. Water is transported from the outlet pool of the low-water-level pumping station to the water conveyance channel 1 through a pressurized pipeline, and flows into the inlet pool of the high-water-level pumping station by gravity.

[0036] In this system, at least one overflow weir 3 is set at the location where overflow is likely to occur on each water conveyance channel. The overflow weir 3 is connected to the regulating water storage tank 4 located below the overflow weir. A water conveyance channel 5 is provided between the regulating water storage tank 4 and the water conveyance channel 1. The volume of the regulating water storage tank is designed according to the actual overflow flow.

[0037] When an overflow occurs due to an accident at the pumping station, the water overflowing from the water conveyance channel 1 flows into the regulating reservoir 4 through the overflow weir 3, thereby storing the overflow water. When the overflow ends and the pumping station resumes normal operation, the water in the regulating reservoir 4 re-enters the water conveyance channel 1 through the water conveyance channel 5, thereby reusing the overflow water.

[0038] Although storing overflow water from pumping stations by building a regulating reservoir next to the channel can effectively store overflow water when pumping stations stop, if the volume of the regulating reservoir is designed based solely on experience, it is inevitable that the volume will be too large or too small. If there is no theoretical guidance before building the regulating reservoir, the overflow prevention effect may not be achieved due to the volume of the regulating reservoir being too small, or the construction cost may be wasted due to the volume of the regulating reservoir being too large.

[0039] Therefore, in an optional implementation, the volume of the regulating reservoir is calculated according to formula (1):

[0040] (1)

[0041] Where V is the volume of the regulating reservoir, m 3L is the projected length of the water conveyance channel connecting two adjacent pumping stations in the horizontal direction, m; b is the bottom width of the water conveyance channel, m; m is the slope coefficient; h is the water level in the water conveyance channel when the first pumping station is operating normally, m; h0 is the elevation difference between the first and second ends of this section of the water conveyance channel, m; h1 is the height of the overflow weir, m.

[0042] The reasoning process of formula (1) is as follows:

[0043] Taking two adjacent pumping stations and the drainage channel between them as a single unit for reasoning and calculation, then:

[0044] Define the bottom slope as i, the bottom width of the water conveyance channel as b, the side slope coefficient as m, the water level in the water conveyance channel when the first pumping station is operating normally as h, the height of the overflow weir as h1, the elevation difference between the two pumping stations (i.e., the elevation difference between the first and second ends of the water conveyance channel) as h0, the length of the water conveyance channel as L, the horizontal projection length of the water conveyance channel corresponding to the overflow weir elevation as L1, the portion of the water conveyance channel length greater than the horizontal projection length of the channel corresponding to the overflow weir elevation as L2, the capacity of the water conveyance channel below the overflow weir elevation as V1, and the capacity of the water conveyance channel at the normal operating water level of the first pumping station as V0.

[0045] Comparing the pump station elevation difference h0 with the overflow weir height h1, the reasoning process for the overflow flow can be divided into two cases based on the difference in their heights: the pump station elevation difference h0 is greater than or equal to the overflow weir height h1. A simplified calculation diagram is shown below. Figure 3 As shown; and the elevation difference h0 of the pumping station is less than the overflow weir height h1, the simplified calculation diagram is as follows. Figure 5 As shown.

[0046] Because there is an elevation difference (i.e., the elevation difference between the first and second ends of the water conveyance channel) between the outlet (head) of the upper pumping station and the inlet pool (tail) of the lower pumping station, and the inlet pool has the lowest elevation, the simplified side view calculation diagram of the water conveyance channel is given as a downward slope from the head to the tail.

[0047] Note: In the formula, the units for length, width, water level, and elevation difference are all meters, the unit for area is square meters, and the unit for reservoir capacity is cubic meters.

[0048] (a) h0≥h1

[0049] Combination Figure 3 As shown, when h0 ≥ h1,

[0050] Storage tank capacity (2)

[0051] in, (3)

[0052] Cross-sectional area of ​​open channel under normal operating water level of pumping station (4)

[0053] Combination Figure 4 As shown, the channel capacity below the overflow weir elevation is the sum of half the volume of a cuboid with height L1 and two triangular pyramids with height L1. Therefore:

[0054] (5)

[0055] Among them, the cross-sectional area of ​​the open channel below the overflow weir elevation (6)

[0056] L1 can be obtained using the similar triangle theorem, that is:

[0057] (7)

[0058] Therefore, when h0 ≥ h1, the capacity of the regulating reservoir is... (8)

[0059] (ii) h0 < h1

[0060] Combination Figure 5 As shown, when h0 < h1,

[0061] Storage tank capacity (9)

[0062] The channel capacity V0 under normal water level operation of the pumping station is given by formulas (3) and (4).

[0063] Combination Figure 6 As shown, the channel capacity below the overflow weir elevation is composed of different trapezoidal cross-sections at the head and tail of the channel below the overflow weir elevation.

[0064] Volume of a frustum. For example... Figure 6 As shown, the headworks section is quadrilateral KLNM, the tailworks section is quadrilateral GHIJ, the tailworks overflow weir elevation is QJ=h1, and the elevation difference between the two pumping stations is MJ=NI=h0. Therefore, the water level at the headworks section corresponding to the overflow weir elevation is QM=h1-h0, V GKMJ =V HLNI .

[0065] The channel capacity V1 below the overflow weir elevation is: (10)

[0066] in, (11)

[0067] (12)

[0068] (13)

[0069] Using the similar triangle theorem, ,but ,Right now (14)

[0070] in, (15)

[0071] (16)

[0072] but, (17)

[0073] According to the Pythagorean theorem

[0074] middle,

[0075] (18)

[0076] middle,

[0077] (19)

[0078] but,

[0079] (20)

[0080] so,

[0081] (twenty one)

[0082] (twenty two)

[0083] (twenty three)

[0084] so,

[0085] (twenty four)

[0086] That is, the channel capacity V1 below the overflow weir elevation is:

[0087] (25)

[0088] Therefore, the capacity V of the regulating reservoir is:

[0089] (26)

[0090] Considering the influence of factors such as channel flow rate, flow velocity, hydraulic loss along the channel, and roughness in actual engineering projects, the theoretical calculation result of the regulating reservoir capacity is too large. Therefore, based on engineering experience, 0.84 times the theoretical calculation result is selected as the actual regulating reservoir capacity.

[0091] Therefore, the expression for calculating the capacity of the regulating reservoir is:

[0092] (1)

[0093] The volume of the regulating reservoir is designed based on the actual overflow flow to ensure effective overflow prevention and to provide theoretical guidance for the construction of the regulating reservoir, thereby reducing manpower and material costs.

[0094] In an optional embodiment, the second end of the water conveyance channel 1 is configured to gradually widen the water intake until it is connected to the intake pool of the high-water-level pumping station.

[0095] In an optional embodiment, the water conveyance channel 5 is connected to the water conveyance channel 1 at an angle, the angle of which can be determined according to the engineering layout, for example, the angle can be 90°.

[0096] In an optional embodiment, a second pumping station 6 is provided on the water conveying channel 5, through which water in the regulating reservoir is pumped back into the water conveying channel.

[0097] In an optional embodiment, the water conveyance channel 1 is configured as a trapezoidal channel with a bottom width smaller than the opening width.

[0098] In an optional embodiment, the height of the water conveyance channel is higher than the water level in the water conveyance channel when the first pumping station is operating normally, preferably by 1m.

[0099] In an optional implementation, the water storage tank is arranged in the open air, and its shape is determined according to the size of the site, topography, geology and other conditions. It has no fixed shape and is generally set as an irregular polygon.

[0100] In an optional implementation, the location and number of the first pumping stations are determined based on the elevation between the low-water-level outlet and the high-water-level inlet, the terrain conditions, and the pumping station head.

[0101] The multi-stage pumping station water conveyance system provided by the present invention allows for the storage and reuse of overflow water. By setting up a storage tank below the overflow weir in the water conveyance channel, when a pumping station fails and causes a large amount of overflow water, the overflow water can be discharged into the open-air storage tank through the overflow weir, which saves water resources and reduces the operating cost of the multi-stage pumping station.

[0102] After the accident is over, the overflow water stored in the storage tank can be pumped back into the channel through the water conveyance channel, such as the return water pipe. Furthermore, if no overflow problem occurs during the operation of the pumping station, the storage tank can also store water in advance, so that irrigation is not limited by the pumping time, alleviating the water demand during peak periods, which is conducive to the development of efficient water-saving agriculture such as micro-irrigation, sprinkler irrigation, and drip irrigation, achieving the goal of dual use of the tank and efficient utilization of water resources.

[0103] It is understandable that the overflow storage and reuse multi-stage pumping station water conveyance system of the present invention can either be built as a complete water conveyance system as needed, or the storage tank of the present invention can be built into the existing multi-stage pumping station water conveyance system to improve the entire water conveyance system.

[0104] To facilitate better understanding, the present invention will be further explained below with specific examples, but the content of the present invention is not limited thereto.

[0105] Example 1

[0106] Take the sixth main canal between the sixth and seventh pumping stations of the second phase of the Jingtaichuan Power Irrigation and Water Resources Utilization Center Project in Gansu Province (hereinafter referred to as the Jingdian Phase II Project) as an example.

[0107] The water conveyance channel adopts the trapezoidal stone channel cross-section, which accounts for the largest proportion of the water conveyance cross-sections. The channel is 19841m long, 2.9m wide at the bottom, has a slope coefficient of 0.75, and a height difference of 4.93m between the two pumping stations. During normal operation, the water depth in the channel is 2.5m, and the overflow weir is 3m high. The inclination angle of the channel is θ, sinθ=4.93 / 19841=0.000248, so θ≈0°. Since the channel is long and the inclination angle is small, the horizontal projection length L of the channel is equivalent to the channel length.

[0108] The Jingdian Phase II project is designed to lift water at a flow rate of 18m³ / h. 3 / s, the increased flow rate has now reached 28m. 3 / s, In actual operation of the project, the capacity of the regulating reservoir mainly depends on the total overflow of the channel during an emergency shutdown under maximum water flow conditions. Therefore, when the downstream pumping station shuts down during normal operation, the emergency response time of the upstream pumping station is 5 minutes. After 5 minutes, the outlet gate of the upstream pumping station can be closed. During this period, the flow rate is increased, and the outlet of the upstream pumping station will have 8400m³ of overflow. 3 Water enters the water conveyance channel, raising the water level in the channel. When the water level exceeds the elevation of the overflow weir, an overflow occurs. The larger the flow rate, the larger the overflow volume, and the larger the required storage tank capacity.

[0109] If a regulating reservoir is built between the six and seven pumping stations, the calculation of the regulating reservoir capacity corresponds to the first case in the above reasoning process, that is, the elevation difference h0 > the overflow weir height h1. Substituting the above parameters into formula (1) yields the regulating reservoir capacity, i.e.

[0110]

[0111] Therefore, the capacity of the regulating reservoir to be built between the sixth and seventh pumping stations of the second phase of the Jingtaichuan Power Irrigation Water Resources Utilization Center in Gansu Province is at least 132,000 m³. 3 .

[0112] Without the construction of a regulating reservoir, the pumping station would generate approximately 130,000 m³ of wastewater if it were to shut down due to an accident. 3 Water overflow can destroy nearby farmland or villages, causing serious secondary disasters and significant losses of hydropower resources. However, the multi-stage pumping station water conveyance system of this invention, which allows for the regulation, storage, and reuse of overflow water, can effectively prevent such accidents from occurring.

[0113] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A multi-stage pumping station water conveyance system for the regulation, storage, and reuse of overflow water, characterized in that, It includes multiple first pumping stations with different heads, which are connected in series through water conveyance channels. The first pumping stations connected in series present an elevation difference from low to high along the direction from low water level to high water level, thus forming a cascade pumping station water conveyance system. Among them, between two adjacent pumping stations, the pumping station with the lower elevation is defined as the low water level pumping station, and the pumping station with the higher elevation is defined as the high water level pumping station. In each pumping station, the first end of the water conveyance channel is connected to the outlet pool of the low-water-level pumping station, and the second end of the water conveyance channel is connected to the inlet pool of the high-water-level pumping station. With the horizon as the X-axis, the position of the first end of the water conveyance channel is higher than the position of the second end in the Y-axis direction, so that an elevation difference is formed between the first end and the second end of the water conveyance channel. Water is transported from the outlet pool of the low-water-level pumping station to the water conveyance channel through pressurized pipelines and flows into the inlet pool of the high-water-level pumping station by gravity. In this system, at least one overflow weir is installed at each location on the water conveyance channel where overflow is likely to occur. The overflow weir is connected to a regulating reservoir located below the overflow weir. A water conveyance channel is provided between the regulating reservoir and the water conveyance channel. The volume of the regulating reservoir is designed according to the actual overflow flow. The volume of the regulating reservoir is calculated according to formula (1): （1） Where V is the volume of the regulating reservoir, m 3 L is the horizontal projected length of the water conveyance channel connecting two adjacent pumping stations, in meters; b is the bottom width of the water conveyance channel, in meters; m is the slope coefficient; h is the water level in the water conveyance channel when the first pumping station is operating normally, in meters; h0 is the elevation difference between the first and second ends of this section of the water conveyance channel, in meters; h1 is the height of the overflow weir, in meters. By designing the volume of the regulating reservoir according to the actual overflow, the system can effectively prevent overflow and provide theoretical guidance for the construction of regulating reservoirs, thereby reducing manpower and material costs. When an overflow occurs due to an accident at the pumping station, the water overflowing from the water conveyance channel flows into the regulating reservoir through the overflow weir, thus storing the overflow water. After the overflow ends and the pumping station resumes normal operation, the water in the regulating reservoir re-enters the water conveyance channel through the water conveyance passage, thus reusing the overflow water.

2. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, The second end of the water conveyance channel is configured as a gradually widening water intake channel until it connects with the inlet pool of the high-water-level pumping station.

3. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, The water conveyance channel is connected to the water conveyance canal at an angle, the angle of which is determined according to the project layout.

4. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, A second pumping station is installed on the water conveyance channel, through which water in the regulating reservoir is pumped back into the water conveyance channel.

5. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, The water conveyance channel is configured as a trapezoidal channel with a bottom width smaller than the opening width.

6. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, The height of the water conveyance channel is higher than the water level in the water conveyance channel when the first pumping station is operating normally.

7. The multi-stage pumping station water conveyance system for adjustable storage and reuse of overflow water according to claim 1, characterized in that, The water storage tank is located in the open air, and its shape is determined by the size of the site and the topographical and geological conditions.

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