An ecological grass-planting ditch for water-rich cities

Abstract

The invention provides an ecological grass planting trench for cities with rich water resource, which is arranged on one side of a sidewalk road. The ecological grass planting trench sequentially comprises a vegetation layer, a planting soil layer, a building block brick layer, a water permeating and discharging pipe and a gravel layer from top to bottom. The ecological grass planting trench is arranged on one side of the sidewall road and used for collecting rainfall running water on the sidewall road, the pollutants in the running water can be reduced, and a purpose for locally purifying the running water and controlling the pollution of the running water can be achieved; the ecological grass planting trench is arranged between the sidewall road and a green land, so that not only is the landscape not influenced, but also convenience in construction can be realized; the rainfall running water is stopped in the gravel layer and gradually and slowly permeated, finally the water content of the soil of the green land is replenished, the rainfall running water can be completely absorbed and purified, and the water for irrigating the green land can be reduced; the lower end of the water permeating and discharging pipe is connected with a rainy water opening or a rainy water well, the other end of the water permeating and discharging pipe is closed, so that the collected rainfall running water on the sidewalk road can be collected into the rainy water opening or the rainy water well, and a purpose for reducing the rainfall running water and postponing the flood peak can be achieved.

Description

technical field [0001] The invention relates to the technical field of rainwater management, in particular to an ecological grass-planting ditch used in cities rich in water resources. Background technique [0002] With the acceleration of urbanization in China, the increase of urban hard roads has led to increasingly prominent problems of urban waterlogging and non-point source pollution. [0003] Urban non-point source pollution refers to the environmental problems caused by rainwater and runoff scouring the urban ground under the condition of precipitation, causing pollutants to enter the receiving water body. The most important pollutants are suspended particles SS, chemical oxygen demand COD, total nitrogen TN, total phosphorus TP and heavy metal ions. Due to the increase of the proportion of impermeable ground, the rainfall runoff has the characteristics of large water volume and poor water quality, resulting in sudden occurrence of non-point source pollution. [000...

AI Technical Summary

Problems solved by technology

Another example is the invention patent application with the application number of 201010277742.0, which announced a method of initial rainwater collection, diversion, peak shaving and ecological purification. The specific size of the grass-planting ditch was designed through the hydraulic calculation of the grass-planting ditch, and at the same time, it was realized in conjunction with the rainwater storage tank. The control of rainwater runoff pollutants has the advantage of occupying a small area. However, this method uses storage tanks to collect rainwater and then treats it with grass-planting ditch. It requires renovation of the rainwater pipe network, which is difficult to implement.

[0006] Cities rich in water resources, such as Shanghai, are extremely short of land resources, with high urban population density and serious non-point source pollution. At the same time, runoff pollution is scattered and difficult to control

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