Rainwater recycling system for dry terraced field

Abstract

The rainwater recycling system mainly comprises a rainwater collecting field, an outdoor rainwater pipeline, a rainwater discarding well, a rainwater collecting pool, a rainwater recycling main pipeline, a terrace crop irrigation pipe network and a traditional water source main pipeline. The system is characterized in that a rainwater collection field is mainly used for collecting rainwater, the rainwater is collected to a rainwater discarding well through an outdoor rainwater pipeline, and after discarded clean rainwater enters a rainwater collection pool to be settled, the clean rainwater enters a rainwater recycling main pipeline and then enters a terrace crop irrigation pipe network to be recycled; a traditional water source serves as a standby water source, and the whole system is controlled by an electric control cabinet. According to the utility model, the irrigation problem of dry land terraced field crops can be solved by effectively utilizing the collected rainwater, and the water-saving irrigation system is a novel water-saving irrigation project; meanwhile, the system is simple in composition and working principle, easy to maintain, safe and reliable, and convenient for large-scale application and popularization of dry terraces in regions with temperate monsoon and subtropical monsoon climate.

Description

Technical Field

[0001] This utility model belongs to the field of water-saving irrigation. Specifically, this utility model relates to a rainwater reuse system for dryland terraced fields. Background Technology

[0002] Terraced farmland in my country is generally small in area and scattered throughout the country. These terraces are often located in economically underdeveloped, remote mountainous and hilly regions, thus receiving far less attention from agricultural projects compared to fertile plains and basins. Traditional, outdated farming methods, combined with the inherent characteristics and influencing factors of terraced fields, significantly impact crop yields. Among these, the abundance of water resources has a particularly pronounced effect on terraced crop yields. In my country's tropical monsoon climate zones, where rainfall is abundant, terraces are primarily paddy fields, and water resources are no longer the main factor determining yield. In my country's subtropical and temperate monsoon climate zones, terraces are mainly dryland fields, where water resources directly determine crop yields. The characteristics of subtropical and temperate monsoon climates are that rainfall is concentrated in a few months throughout the year, making these months prone to flooding and water waste. Rainfall in the remaining months is often insufficient to meet the needs of crop growth. Terraced fields, located on mountainsides, have poor water retention capacity and deep water tables. Without a stable water source and a mature irrigation system, crop yields are highly uncertain. Even if irrigation systems covering the entire area are built, the abundance of traditional water sources is generally proportional to rainfall; that is, when rainfall is low, the water supply from traditional sources also decreases, potentially failing to meet the irrigation needs of large-scale terraced fields. Moreover, long-term reliance on traditional water sources for irrigation consumes valuable water resources during the non-rainy season and wastes considerable energy due to the terrain's elevation differences. Therefore, developing a rainwater recycling system for dryland terraced fields is essential for achieving water and energy conservation and reducing farming costs in these areas.

[0003] This utility model mainly consists of two parts: a rainwater irrigation system and a traditional water irrigation system. The rainwater irrigation system mainly includes a rainwater collection area, rainwater inlets, rainwater inlet connecting pipes, rainwater well chambers, outdoor rainwater pipes, rainwater diversion wells, rainwater diversion pipes, rainwater collection ponds, a main rainwater reuse pipeline, and electric valve A. The traditional water irrigation system mainly includes electric valve B, a traditional water source main pipeline, a variable frequency irrigation pump, and a traditional water source. It also includes a terraced crop irrigation network and an electrical control cabinet. Before use, electric valves A and B are kept closed. During use, the system automatically opens electric valve A, prioritizing the gravity-fed rainwater irrigation system, and delivers the reused rainwater into the terraced crop irrigation network for utilization. This achieves water and energy conservation, while also saving farmers' electricity costs. When the rainwater in the rainwater collection tank is used up but irrigation still needs to continue, the entire system automatically closes electric valve A and simultaneously opens electric valve B. At this time, the traditional water irrigation system comes into play as a backup system for the rainwater irrigation system and continues to work until the irrigation task is completed, at which point the system automatically closes electric valve B. This rainwater collection area can also serve as a place for farmers to dry crops during months when irrigation is not required, achieving two benefits at once. Furthermore, this invention has no complex principles or structure, is simple to understand, and is readily accepted and used by farmers, making it worthy of large-scale promotion and use in vast dryland terraced fields. Utility Model Content

[0004] In view of the shortcomings of existing technologies, this utility model provides a rainwater reuse system for dryland terraced fields. The purpose is to respond to the national call for water and energy conservation and to design a water-saving and energy-saving irrigation system that is suitable for promotion and use in dryland terraced farming areas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a rainwater reuse system for dryland terraced fields, mainly including a rainwater collection field (01), a rainwater inlet (02), a rainwater inlet connecting pipe (03), a rainwater well chamber (04), an outdoor rainwater pipe (05), a rainwater diversion well (06), a rainwater diversion pipe (07), a rainwater collection pool (08), a rainwater reuse main pipe (09), an electric valve A (10), a terraced crop irrigation network (11), an electric valve B (12), a traditional water source main pipe (13), a variable frequency irrigation pump (14), a traditional water source (15), an electrical control cabinet (16), an electric valve C (17), an electric valve D (18), an A pool inlet distribution well (19), an A pool (20), an inclined plate (21), an A pool overflow weir (22), a B pool inlet distribution well (23), a B pool (24), a collection well (25), and an irrigation nozzle (26).

[0006] The present invention describes a rainwater recycling system for dryland terraced fields, wherein the rainwater collection field (01) is located on a non-high-quality cultivated land part on one side of the terraced field. The rainwater collection field (01) is flat and impermeable, and can effectively prevent external water from entering.

[0007] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the rainwater inlets (02) are evenly arranged along the edge of the rainwater collection field (01), the rainwater inlets are made of HDPE rigid plastic, and the rainwater grates are made of cast iron.

[0008] The rainwater reuse system for dryland terraced fields described in this utility model has rainwater inlets (02) connected to nearby rainwater well chambers (04) via rainwater inlet connecting pipes (03). The rainwater well chambers (04) are connected in series by outdoor rainwater pipes (05), with the slope sloping towards the rainwater collection pool (08).

[0009] The present invention describes a rainwater reuse system for dryland terraced fields. The first well chamber in front of the rainwater collection tank (08) is a rainwater diversion well (06). The rainwater diversion well (06) has three pipe interfaces: one interface is connected to the outdoor rainwater pipe (05), one interface is connected to the rainwater collection tank (08), and one interface is connected to the rainwater diversion pipe (07).

[0010] The rainwater reuse system for dryland terraced fields described in this utility model is made of HDPE rigid plastic, and the well cover is made of cast iron. The rainwater inlet connecting pipe (03), rainwater well chamber (04), outdoor rainwater pipe (05), rainwater diversion well (06), and rainwater diversion pipe (07) are all made of HDPE rigid plastic.

[0011] The present invention describes a rainwater reuse system for dryland terraced fields, wherein an electric valve C (17) is installed on the outdoor rainwater pipe (05) connecting the rainwater diversion well (06) and the rainwater collection pool (08).

[0012] The present invention describes a rainwater reuse system for dryland terraced fields, wherein an electric valve D (18) is installed near the rainwater diversion pipe (07) that connects the rainwater diversion well (06) and the rainwater diversion pipe (07).

[0013] The present invention describes a rainwater reuse system for dryland terraced fields. The main rainwater reuse pipeline (09) is connected to a rainwater collection tank (08) on the other side opposite to the rainwater diversion well (06). An electric valve A (10) is installed on the main rainwater reuse pipeline (09), and the pipeline is connected to the main pipeline of the terraced field crop irrigation network (11) after the valve.

[0014] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the variable frequency irrigation pump (14) has a suction pipe that extends into a traditional water source (15), and a pressure pipe that connects to the main pipeline of the traditional water source (13). An electric valve B (12) is installed on the main pipeline of the traditional water source (13), and the valve is connected to the main pipeline of the terraced field crop irrigation network (11).

[0015] The present invention describes a rainwater reuse system for dryland terraced fields, wherein electric valves A (10), B (12), C (17), and D (18) are installed in valve wells, the valve wells are made of HDPE, and the well covers are made of cast iron.

[0016] The present invention describes a rainwater reuse system for dryland terraces, wherein the rainwater collection field (01) and rainwater collection pond (08) are at a sufficient height above the terraces they serve.

[0017] The rainwater recycling system for dryland terraced fields described in this utility model has a rainwater collection pool (08) mainly composed of two compartments: the first compartment is pool A (20) and the second compartment is pool B (24).

[0018] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the rainwater collection pool (08) has an A pool water inlet distribution well (19) installed at the inlet end of the first compartment, and the first compartment is equipped with inclined plates (21) except for the A pool water inlet distribution well (19).

[0019] The present invention describes a rainwater reuse system for dryland terraced fields. The rainwater collection tank (08) has an A-pool inlet distribution well (19) in the first compartment connected to an outdoor rainwater pipe (05) at one end and connected to the A-pool (20) with an inclined plate (21) at the other end through a water passage.

[0020] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the water passages of the inlet distribution well (19) of the first grid A pool are evenly distributed at the lower part of the partition wall, and the upper edge of the water passage is a certain distance lower than the lower edge of the inclined plate (21), and a certain number of water passages are provided.

[0021] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the outlet part of the A pool (20) of the rainwater collection pool (08) is provided with an A pool overflow weir (22), and the second compartment B pool inlet distribution well (23) is located after the A pool overflow weir (22).

[0022] The present invention describes a rainwater reuse system for dryland terraced fields. The rainwater collection pool (08) has a B pool water inlet distribution well (23) installed at the water inlet end of the second compartment. The second compartment is divided into rectangular empty pools except for the B pool water inlet distribution well (23). The B pool water inlet distribution well (23) is connected to the B pool (24) through a water passage.

[0023] The present invention describes a rainwater reuse system for dryland terraced fields. The partition wall between the B pool (24) of the rainwater collection pool (08) and the water collection well (25) is provided with a water passage. The water flows into the water collection well (25) through the water passage. The water collection well (25) is connected to the main rainwater reuse pipeline (09).

[0024] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the water passages in the B pool (24) are evenly distributed under the partition wall below the water surface, and the lowest water passage is higher than the upper edge of the sedimentation zone, and a certain number of water passages are provided.

[0025] The present invention describes a rainwater reuse system for dryland terraced fields, wherein irrigation nozzles (26) are installed at the end of the terraced field crop irrigation pipe network (11).

[0026] The present invention describes a rainwater reuse system for dryland terraced fields, which uses the liquid level of the B pool (23) as a signal to control the opening and closing of electric valves A (10), B (12), C (17), and D (18) through an electrical control cabinet (16).

[0027] The present invention describes a rainwater reuse system for dryland terraced fields, wherein the highest liquid level of the B pool (23) is equal to the top elevation of the outdoor rainwater pipe (05), and the lowest liquid level is a certain distance higher than the top elevation of the main rainwater reuse pipe (09).

[0028] The rainwater reuse system for dryland terraced fields described in this utility model has electric valves A (10), B (12), C (17), and D (18) that can be manually controlled to open and close.

[0029] The rainwater reuse system for dryland terraced fields described in this utility model is as follows: Before use, electric valves A (10), B (12), and C (17) are kept closed, while electric valve D (18) remains open, and the entire system is in standby mode for rainwater collection. When rainfall occurs, the initial rainwater is diverted through the rainwater diversion pipe (07). Electric valve D (18) is then closed, and electric valve C (17) is opened simultaneously. The clean rainwater after diversion flows by gravity into the rainwater collection tank (08). After passing through two stages of sedimentation in tank A (20) and tank B (24), the clean rainwater is stored in tank B (24) for use in the irrigation system. When the water level in tank B (24) reaches its maximum level, electric valve C (17) closes automatically, and electric valve D (18) opens automatically. All excess rainwater is discharged through the rainwater diversion pipe (07), preventing flooding.

[0030] The rainwater reuse system for dryland terraced fields described in this utility model automatically opens electric valve A (10) during use, prioritizing the use of gravity-fed rainwater irrigation systems to deliver reused rainwater into the terraced crop irrigation network (11) for utilization. This achieves water and energy conservation, while also saving farmers' electricity costs. When the reused rainwater in the rainwater collection tank (08) is not fully utilized during a single irrigation session and the irrigation task is completed, the entire system automatically closes electric valve A (10), and the entire system returns to its initial state. When the water level in the rainwater collection tank (08) reaches the minimum level and irrigation is still required, the entire system automatically closes electric valve A (10) and simultaneously opens electric valve B (12). At this time, the traditional water irrigation system comes into play as a backup system for the rainwater irrigation system and continues to work until the irrigation task is completed, at which point the system automatically closes electric valve B (12).

[0031] The rainwater recycling system for dryland terraced fields described in this utility model has a rainwater collection tank (08) as its core technology. Tank A (20) is a simplified inclined plate sedimentation tank, and Tank B (24) is a simplified horizontal flow sedimentation tank that also serves as a water storage tank. The two tanks are connected in series to improve the sedimentation efficiency. The effective volume of Tank B (24) is the maximum usable water storage volume of the entire rainwater recycling system. The water level in Tank B (24) determines the opening and closing states of electric valves C (17) and D (18).

[0032] The rainwater recycling system for dryland terraced fields described in this utility model includes a rainwater collection area (01) that can be used by farmers to dry crops during months when irrigation is not required. It should be noted that when the rainwater collection area (01) is used for other purposes, the rainwater inlets (02) must be covered or equipped with debris-proof inlets. After the rainwater collection area (01) is used for other purposes, it must be thoroughly cleaned to prevent large amounts of debris from entering the outdoor rainwater pipes (05) through the rainwater inlets (02) during the planting season.

[0033] The rainwater recycling system for dryland terraced fields described in this utility model is characterized in that the rainwater collection field (01), rainwater collection pond (08), and other facilities within the scope of one's own farmland serve the irrigation system of downstream farms that are several meters lower in elevation than one's own farmland. The rainwater collection field (01), rainwater collection pond (08), and other facilities of upstream farms that are several meters higher in elevation than one's own farmland serve the irrigation system of one's own farmland. In other words, the rainwater recycling system located within the scope of each farmland is not a rainwater recycling system serving that farmland; the rainwater collection field (01) used by each farmland serves the rainwater collection field (01) of downstream farms. This requires all villagers to have a strong sense of unity and cooperation to jointly maintain this rainwater recycling system for dryland terraced fields.

[0034] The rainwater reuse system for dryland terraced fields described in this utility model has the following advantages: the system principle is simple and does not require complex professional knowledge, making it easy for farmers to accept; the entire system can effectively save water and energy, and the electrical control principle is simple; the entire system is inexpensive and easy to maintain, making it suitable for large-scale adoption and promotion in dryland terraced field areas with temperate monsoon and subtropical monsoon climates. Attached Figure Description

[0035] Figure 1 This is the working process of this utility model. Figure 1 ;

[0036] Figure 2 This is the working process of this utility model. Figure 2 ;

[0037] Figure 3 This is a plan view of the present invention;

[0038] Figure 4 This is a cross-sectional schematic diagram of the present invention;

[0039] Figure 5 This is a schematic diagram of the rainwater collection tank of this utility model;

[0040] Figure 6 This is a partial detailed drawing of this utility model;

[0041] Figure 7 This is a schematic diagram of the water level of this utility model;

[0042] In the figure, (01) rainwater collection field, (02) rainwater inlet, (03) rainwater inlet connecting pipe, (04) rainwater well chamber, (05) outdoor rainwater pipe, (06) rainwater diversion well, (07) rainwater diversion pipe, (08) rainwater collection pool, (09) rainwater reuse main pipe, (10) electric valve A, (11) terraced crop irrigation network, (12) electric valve B, (13) traditional water source main pipe, (14) variable frequency irrigation pump, (15) traditional water source, (16) electrical control cabinet, (17) electric valve C, (18) electric valve D, (19) A pool inlet distribution well, (20) A pool, (21) inclined plate, (22) A pool overflow weir, (23) B pool inlet distribution well, (24) B pool, (25) collection well, (26) irrigation nozzle. Detailed Implementation

[0043] This utility model provides a rainwater reuse system for dryland terraced fields. To make the purpose, technical solution and usage effect of this utility model clearer and more explicit, the following describes this utility model in detail with reference to the accompanying drawings.

[0044] Please see Figure 3 and Figure 4 and Figure 5 and Figure 6 and Figure 7 This example provides a rainwater reuse system for dryland terraced fields, which mainly includes a rainwater collection field (01), a rainwater inlet (02), a rainwater inlet connecting pipe (03), a rainwater well chamber (04), an outdoor rainwater pipe (05), a rainwater diversion well (06), a rainwater diversion pipe (07), a rainwater collection pool (08), a rainwater reuse main pipe (09), an electric valve A (10), a terraced crop irrigation network (11), an electric valve B (12), a traditional water source main pipe (13), a variable frequency irrigation pump (14), a traditional water source (15), an electrical control cabinet (16), an electric valve C (17), an electric valve D (18), an A pool inlet distribution well (19), an A pool (20), an inclined plate (21), an A pool overflow weir (22), a B pool inlet distribution well (23), a B pool (24), a collection well (25), and an irrigation nozzle (26).

[0045] Please see Figure 3 and Figure 4 In this example, the rainwater collection field (01) is located on a non-high-quality farmland part on one side of the terrace. The rainwater collection field (01) has a cement ground with dimensions of L×B=30m×30m. It is flat and impermeable, and is surrounded by protective measures to prevent external water from entering.

[0046] Please seeFigure 3 and Figure 4 In this example, rainwater inlets (02) are evenly arranged along the edge of the rainwater collection field (01), with a total of 8 rainwater inlets (02). The rainwater inlets are made of HDPE rigid plastic, and the rainwater grate is made of cast iron.

[0047] Please see Figure 2 and Figure 3 In this example, all rainwater inlets (02) are connected to nearby rainwater well chambers (04) through rainwater inlet connecting pipes (03). The rainwater well chambers (04) are connected in series by outdoor rainwater pipes (05), with the slope sloping towards the rainwater collection pool (08).

[0048] Please see Figure 3 and Figure 4 In this example, the diameter of the rainwater inlet connecting pipe (03) is DN200, and the diameter of the outdoor rainwater pipe (05) is DN300.

[0049] Please see Figure 3 and Figure 4 and Figure 5 In this example, the first chamber in front of the rainwater collection tank (08) is the rainwater diversion well (06). The rainwater diversion well (06) has three pipe interfaces: one interface is connected to the outdoor rainwater pipe (05), one interface is connected to the rainwater collection tank (08), and one interface is connected to the rainwater diversion pipe (07).

[0050] Please see Figure 3 and Figure 4 and Figure 5 In this example, the diameter of the rainwater diversion pipe (07) is DN300.

[0051] Please see Figure 3 and Figure 4 and Figure 5 In this example, the rainwater inlet connecting pipe (03), rainwater well chamber (04), outdoor rainwater pipe (05), rainwater diversion well (06), and rainwater diversion pipe (07) are made of HDPE rigid plastic, and the well cover is made of cast iron.

[0052] Please see Figure 3 and Figure 4 and Figure 5 In this example, an electric valve C (17) is installed on the outdoor rainwater pipe (05) connecting the rainwater diversion well (06) and the rainwater collection tank (08).

[0053] Please see Figure 3 and Figure 4 and Figure 5 In this example, an electric valve D (18) is installed near the rainwater diversion pipe (07) that connects the rainwater diversion well (06) and the rainwater diversion pipe (07).

[0054] Please see Figure 3 and Figure 4 and Figure 5 In this example, the main rainwater reuse pipeline (09) is connected to the rainwater collection tank (08) on the other side opposite to the rainwater diversion well (06). An electric valve A (10) is installed on the main rainwater reuse pipeline (09), and the main pipeline of the terraced crop irrigation network (11) is connected after the valve.

[0055] Please see Figure 3 and Figure 4 and Figure 5 In this example, the diameter of the main rainwater reuse pipeline (09) is DN150.

[0056] Please see Figure 3 and Figure 4 and Figure 4 In this example, the suction pipe of the variable frequency irrigation pump (14) extends into the traditional water source (15), and the pressure pipe is connected to the main pipeline of the traditional water source (13). An electric valve B (12) is installed on the main pipeline of the traditional water source (13), and the pipeline of the terraced crop irrigation network (11) is connected after the valve.

[0057] Please see Figure 5 and Figure 5 and Figure 4 In this example, electric valves A (10), B (12), C (17), and D (18) are installed in the valve well. The valve well is made of HDPE and the well cover is made of cast iron.

[0058] Please see Figure 5 and Figure 5 In this example, the rainwater collection field (01) and rainwater collection pond (08) are 30m higher than the terraced fields they serve.

[0059] Please see Figure 4 and Figure 5 In this example, the rainwater collection pool (08) is mainly composed of two compartments: the first compartment is pool A (20) and the second compartment is pool B (24).

[0060] Please see Figure 4 In this example, the dimensions of pool A (20) are: L×B×H=5.0m×3.0m×5.0m, and the dimensions of pool B (24) are: L×B×H=10.0m×3.0m×3.5m.

[0061] Please see Figure 5 and Figure 4 In this example, the A pool water inlet distribution well (19) is set at the water inlet end of the first compartment of the rainwater collection tank (08), and the part of the first compartment except for the A pool water inlet distribution well (19) is set with inclined plate (21).

[0062] Please seeFigure 5 In this example, the length of the water inlet distribution well (19) in the first compartment A is 1.0m, and the vertical height of the inclined plate (21) is 0.9m.

[0063] Please see Figure 5 and Figure 6 In this example, the height of the sludge collection area of ​​pool A (20) is 0.5m, the height of the water distribution area is 2.0m, the height of the inclined plate area is 0.9m, the height of the clear water area is 1.2m, and the air gap is 0.4m.

[0064] Please see Figure 5 and Figure 6 In this example, the A pool inlet distribution well (19) in the first compartment of the rainwater collection pool (08) is connected to the outdoor rainwater pipe (05) at one end and to the A pool (20) with the inclined plate (21) at the other end through the water passage.

[0065] Please see Figure 4 and Figure 5 In this example, the water passages are set on the partition wall at the same height as the water distribution area. The upper edge of the uppermost row of water passages is 0.15m lower than the lower edge of the inclined plate (21), and the lower edge of the lowermost row of water passages is 0.15m higher than the upper edge of the sedimentation area. The water passages are circular with a diameter of 0.1m and are evenly arranged. A total of 130 water passages are set.

[0066] Please see Figure 5 and Figure 4 In this example, the A pool (20) of the rainwater collection pool (08) is provided with an overflow weir (22), and the second grid B pool water inlet distribution well (23) is located after the overflow weir (22).

[0067] Please see Figure 5 and Figure 4 In this example, the overflow weir (22) of pool A is a sawtooth weir with the same width as pool A (20), the sawtooth height is 0.1m, and it is a right triangle with a vertex angle of 45°.

[0068] Please see Figure 5 and Figure 6 In this example, the inlet end of the second compartment of the rainwater collection tank (08) is equipped with a B pool inlet distribution well (23). The second compartment is divided into rectangular empty pools except for the B pool inlet distribution well (23). The B pool inlet distribution well (23) is connected to the B pool (24) except for the B pool inlet distribution well (23) through a water passage.

[0069] Please see Figure 4 In this example, the length of the water inlet distribution well (23) of the second cell B is 1.0m, and the width is the same as that of the B cell (24).

[0070] Please see Figure 5 and Figure 4In this example, the height of the sludge collection zone in pool B (24) is 0.5m, the height of the sedimentation zone is 2.6m, and the air gap is 0.4m.

[0071] Please see Figure 5 and Figure 6 and Figure 3 In this example, a water passage is provided in the partition wall between the B pool (24) of the rainwater collection pool (08) and the collection well (25). The water flows into the collection well (25) through the water passage. The collection well (25) is connected to the main rainwater reuse pipeline (09).

[0072] Please see Figure 4 and Figure 1 In this example, the length of the water collection well (25) is 1.0m, and the width is the same as that of pool B (24).

[0073] Please see Figure 2 and Figure 3 and Figure 4 In this example, the water passages in pool B (24) are evenly distributed on the partition wall below the water surface. The upper edge of the uppermost row of water passages is 0.1m below the water surface, and the lower edge of the lowermost row of water passages is 0.1m above the upper edge of the sedimentation zone. The water passages are circular with a diameter of 0.1m and are evenly distributed. A total of 174 water passages are set up.

[0074] Please see Figure 7 and Figure 7 In this example, irrigation nozzles (26) are installed at the end of the terraced crop irrigation network (11), and irrigation is carried out in a rotating irrigation manner.

[0075] Please see Figure 1 and Figure 2 and Figure 3 and Figure 4 and ​ In this example, the liquid level of pool B (23) is used as a signal to control the opening and closing of electric valves A (10), B (12), C (17), and D (18) through the electrical control cabinet (16).

[0076] Please see ​ In this example, the highest liquid level of pool B (23) is equal to the top elevation of the outdoor rainwater pipe (05), and the lowest liquid level is equal to the top elevation of the rainwater reuse main pipe (09) plus 200mm.

[0077] Please see ​ and ​ and ​ and ​ In this example, electric valves A (10), B (12), C (17), and D (18) can all be manually controlled to open and close.

[0078] One specific working method of this example is as follows: Before use, electric valves A (10), B (12), and C (17) are kept closed, while electric valve D (18) remains open, and the entire system is in standby mode for rainwater collection. When rainfall occurs, the initial rainwater is diverted through the rainwater diversion pipe (07), then electric valve D (18) is closed, and electric valve C (17) is opened simultaneously. The clean rainwater after diversion flows into the rainwater collection tank (08) by gravity, and after passing through two stages of sedimentation in tank A (20) and tank B (24), the clean rainwater is stored in tank B (24) for use by the irrigation system. When the water level in tank B (24) reaches the highest level, electric valve C (17) closes automatically, and electric valve D (18) opens automatically. All excess rainwater is discharged through the rainwater diversion pipe (07), preventing flooding.

[0079] The second specific working method of this example is as follows: When in use, the system automatically opens the electric valve A (10), and prioritizes the use of the gravity-fed rainwater irrigation system to send the recycled rainwater into the terraced crop irrigation network (11) for utilization, which can achieve the effects of water conservation and energy conservation, and also save farmers' electricity expenses. When the recycled rainwater in the rainwater collection tank (08) is not used up in a single irrigation and the irrigation task is completed, the entire system automatically closes the electric valve A (10), and then the entire system returns to the initial state. When the water level in the rainwater collection tank (08) reaches the minimum water level and irrigation is still needed, the entire system automatically closes the electric valve A (10) and opens the electric valve B (12). At this time, the traditional water irrigation system plays a role as a backup system for the rainwater irrigation system and continues to work until the irrigation task is completed, and the system automatically closes the electric valve B (12).

[0080] In this example, the rainwater collection tank (08) is the core technology of this utility model. Tank A (20) is a simplified inclined plate sedimentation tank, and Tank B (24) is a simplified horizontal flow sedimentation tank. The two tanks are connected in series to improve the sedimentation efficiency of the tanks. The effective volume of Tank B (24) is the maximum usable water storage volume of the entire rainwater reuse system. The water level in Tank B (24) determines the opening and closing states of electric valves C (17) and D (18).

[0081] In this example, the rainwater harvesting area (01) can be used as a place for farmers to dry crops during months when irrigation is not required. It should be noted that when the rainwater harvesting area (01) is used for other purposes, the rainwater inlets (02) must be covered, or debris-proof rainwater inlets must be used. After the rainwater harvesting area (01) is used for other purposes, the area must be thoroughly cleaned to prevent large amounts of debris from entering the outdoor rainwater pipes (05) through the rainwater inlets (02) during the planting season.

[0082] In this example, the rainwater harvesting area (01), rainwater collection pond (08), and other facilities within the owner's own farmland serve the irrigation system of the downstream farmland, which is 30 meters lower in elevation than the owner's farmland. The rainwater harvesting area (01), rainwater collection pond (08), and other facilities of the upstream farmland, which is 30 meters higher in elevation than the owner's farmland, serve the irrigation system of the owner's farmland. In other words, the rainwater reuse system located within each owner's farmland is not a rainwater reuse system serving the owner's own farmland; the rainwater harvesting area (01) used by the owner serves the rainwater harvesting area (01) of the downstream farmland.

[0083] The beneficial effects of this example are: the system principle is simple and does not require complex professional knowledge, making it easy for farmers to accept; the entire system can effectively save water and energy, while the electrical control principle is simple; the entire system is inexpensive and easy to maintain, making it suitable for large-scale adoption and promotion in arid terraced fields with temperate monsoon and subtropical monsoon climates.

[0084] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of this utility model, and all such changes or substitutions should fall within the protection scope of this utility model.

Claims

1. A rainwater reuse system for dryland terraced fields, mainly comprising a rainwater collection field (01), a rainwater inlet (02), a rainwater inlet connecting pipe (03), a rainwater well chamber (04), an outdoor rainwater pipe (05), a rainwater diversion well (06), a rainwater diversion pipe (07), a rainwater collection pool (08), a rainwater reuse main pipe (09), an electric valve A (10), a terraced crop irrigation network (11), an electric valve B (12), a traditional water source main pipe (13), a variable frequency irrigation pump (14), a traditional water source (15), and an electrical control cabinet (16); characterized in that: The rainwater collection field (01) is located on a non-high-quality farmland section on one side of the terrace. The rainwater collection field (01) is flat and impermeable, and can effectively prevent external water from entering. The rainwater inlets (02) are evenly distributed along the edge of the rainwater collection field (01). All rainwater inlets (02) are connected to the nearby rainwater well chamber (04) through rainwater inlet connecting pipes (03). The rainwater well chambers (04) are connected in series by outdoor rainwater pipes (05), and the slope is towards the rainwater collection pool (08). The first well chamber in front of the rainwater collection pool (08) is the rainwater diversion well (06). The rainwater diversion well (06) has three pipe interfaces, one interface is connected to the outdoor rainwater pipe (05), and one interface is connected to the rainwater collection pool. The pool (08) has an interface connected to the rainwater diversion pipe (07). The rainwater reuse main pipe (09) is connected to the rainwater collection pool (08) on the opposite side of the rainwater diversion well (06). An electric valve A (10) is installed on the rainwater reuse main pipe (09), and the main pipe of the terraced crop irrigation network (11) is connected after the valve. The variable frequency irrigation pump (14) draws water from the traditional water source (15), pressurizes it and sends it into the traditional water source main pipe (13). An electric valve B (12) is installed on the traditional water source main pipe (13), and the main pipe of the terraced crop irrigation network (11) is connected after the valve. The rainwater collection field (01) and the rainwater collection pool (08) are higher than the terraced fields they serve.

2. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The rainwater collection pool (08) consists of two main compartments.

3. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The rainwater collection tank (08) has an inlet distribution well at the inlet end of the first compartment, and inclined plates are installed in the part of the first compartment except for the inlet distribution well.

4. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The first compartment of the rainwater collection tank (08) has an inlet distribution well connected to an outdoor rainwater pipe (05) at one end, and the other end connected to the first compartment collection tank with an inclined plate through a water passage.

5. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The first section of the rainwater collection tank (08) is equipped with an overflow weir, and the second section is a water inlet distribution well behind the overflow weir.

6. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The rainwater collection tank (08) has an inlet distribution well at the inlet end of the second compartment. The second compartment is divided into a rectangular empty pool except for the inlet distribution well. The inlet distribution well is connected to the second collection tank through a water passage.

7. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The second section of the rainwater collection tank (08) is connected to the collection well through a water passage, and the collection well is connected to the main rainwater reuse pipeline (09).

8. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The water inlet distribution well in the first compartment and the water collection pool in the first compartment are connected by water passages that are evenly distributed at the bottom of the partition wall between the two, with the upper edge of the highest water passage being lower than the lower edge of the inclined plate.

9. A rainwater reuse system for dryland terraced fields as described in claim 1, characterized in that: The water passages in the second compartment are evenly distributed on the partition wall below the water surface, with the lowest water passage being higher than the upper edge of the sedimentation zone.

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