Drainage channel overflow weir for reducing agricultural non-point source pollution
A technology for agricultural non-point source pollution and drainage ditches, applied in agriculture, soil drainage, water/sewage multi-stage treatment, etc., to achieve the effects of slowing down the flow rate, good promotion and application value, and increasing the concentration of dissolved oxygen
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[0020] At the position where the farmland drainage ditch 2 is close to the river 4, a weir 3 that can purify the water quality to a certain extent, a drainage weir that can reduce agricultural non-point source pollution is set in the drainage ditch. The weir is composed of a sand-gravel filter layer 11, a combined ecological sewage purification device and a permeable concrete weir 9. The combined ecological sewage purification device is arranged between the sand-gravel filter layer 11 and the permeable concrete weir 9. The sand-gravel filter layer It is set at the head end of the weir facing the incoming water. The weir is set in the overflow section of the drainage ditch. The height of the weir is equal to the elevation of the falling water level (the daily water level of the drainage ditch)13. The sand-gravel filter layer is composed of crushed stones with a particle size of 2-8 mm and fine sand with a particle size of 1.0-1.6 mm. The combined ecological sewage purification d...
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