Method for designing ecological pollution reducing drainage channel

Abstract

The invention relates to a method for designing an ecological pollution reducing drainage channel, which comprises the following steps: (a) digging a drainage channel according to the drainage and water-logging prevention standards or repairing the drainage channel with a trapezoidal cross section; (b) paving honeycombed concrete precast slabs with a plurality of holes on the two sides of the channel to keep the smooth drainage of farmlands and the stability of slopes; (c) planting a submerged plant in the holes of the honeycombed concrete precast slabs, wherein the submerged plant is eel grass, hornwort, waterweed, water milfoil, pondweed or ruppia maritima; (d) setting wide-top weir type water retaining dams in the ecological pollution reducing drainage channel at intervals of 200 to 500 meters, and setting a control gate at the top of the wide-top weir type water retaining dam; and (e) setting a scale for measuring water at one side of the wide-top weir type water retaining dam. The method can prevent the collapse of the drainage channel, keep the stability of the side slope and the smooth drainage, implement the drainage measurement and control the drainage under the conditionof meeting the drainage and water-logging prevention standards of the farmland, and reduce the loss of fertilizer nutrients from an irrigation and drainage system.

Description

technical field [0001] The invention relates to a design method for drainage ditches, in particular to a design method for ecological pollution reduction type drainage ditches. Background technique [0002] Since the founding of the People's Republic of China, the Party and the government have attached great importance to the development of irrigation and drainage. The irrigated area of ​​farmland has now reached 830 million mu. The annual irrigated area accounts for 3 / 4 of the national total, and the production of economic crops accounts for 90 percent of the country's total. % or more, so that my country can solve the problem of food and clothing for 22% of the world's population with 6% of the world's renewable water resources and 9% of the arable land, and has created a great opportunity to ensure China's agricultural production, food security, and stable economic and social development. important conditions. [0003] With the in-depth development of supporting facilities...

AI Technical Summary

Problems solved by technology

For this reason, Chen Jinshan proposes a kind of technology (ecological concrete technology for water pollution control [J], Journal of Building Materials, 2003, 3 (4), pp. 60-64) that uses ecological concrete slab to build water purification ditch, but, When this kind of technology is applied to sewage treatment, there are still solid substances in the sewage deposited on the concrete, which will quickly block the pores of the macroporous concrete, making it lose the water purification function; and the water purification effect of ordinary ecological concrete (especially turbidity, etc.) is not ideal; a large amount of calcium ions are lost in the flowing water of concrete, which causes the decomposition of cement hydration products, resulting in a decrease in strength and even destruction, resulting in insufficient durability of concrete and many other problems

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