Open trench control drainage device for rice-wheat crop rotation farmlands

Abstract

The invention provides an open trench control drainage device for rice-wheat crop rotation farmlands. The device comprises a lock chamber, wherein the lock chamber is divided into upper and lower layers, and wing walls are respectively distributed at two ends of the lock chamber; a culvert pipe is distributed in the lower layer of the lock chamber, and a gate is arranged at the front end of the culvert pipe in the lower chamber; an overflow tank is formed into the upper layer of the lower chamber, and dam troughs are oppositely distributed at two sides of the wall at the rear end of the overflow tank; and a water retaining weir plate is inserted into the dam trough. Through the device, the retention time of the farmland drainage in the trench is increased, so that the pollutants in the trench are absorbed, adsorbed and degraded; the downstream water body pollution can be reduced; and the water eutrophication can be controlled. Because the device is permanently and fixedly arranged at the rear end of a drainage trench, the improvement on a drainage system of rice-wheat crop rotation can be avoided, and the water conservancy cost of the farmland is greatly reduced. The device is low in construction cost and maintenance cost, compact in structure, simple to operate, and easy for promoting in large area.

Description

Technical field [0001] The invention relates to the technical field of farmland drainage, in particular to an open ditch controlled drainage device suitable for rice-wheat rotation farmland by arranging gates and weirs at the end of the drainage open ditch. Background technique [0002] At present, many regions in my country adopt the cropping pattern of rice-wheat rotation. Although there are technologies for controlling drainage in rice fields, they did not consider the difference in water requirements of the two crops of rice and wheat. Drainage control devices were installed in the rice section, and the wheat season needs to be removed to facilitate drainage and prevent wheat from being soiled. In addition, the discharge of non-point source pollution from rice fields is also an important factor in the eutrophication of water bodies such as rivers and lakes. When different crops are rotated, it is necessary to control farmland drainage ditch, improve water use efficiency duri...

AI Technical Summary

Problems solved by technology

Although there are techniques for controlling drainage in paddy fields, they do not take into account the difference in field water requirements between rice and wheat cr

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