Ecological Drainage Method of Purifying and Reducing Rainwater Runoff of Expressway

Abstract

An ecological drainage method to purify and reduce the rainwater runoff of the expressway. The drainage ditches on both sides of the expressway are designed to have the functions of infiltration, purification and drainage. The particulate pollutants in the rainwater runoff on the road surface are intercepted and filtered to reduce the erosion of the follow-up measures by the rainwater runoff on the road surface; a vegetation filter belt connected to the shallow gravel ditch is set up to filter and absorb the rainwater, and the soil absorbs and infiltrates. Degradation of microorganisms; set up depressions behind the vegetation filter belt to further improve the water quality of expressway rainwater runoff through physical, chemical and biochemical effects, prolong the peak time of runoff, and reduce the peak runoff and runoff volume. The invention realizes the effective control of rainwater runoff and pollution on the expressway from the source, and provides a feasible way for building an environment-friendly and resource-saving expressway.

Description

technical field [0001] The invention relates to a highway drainage method, in particular to an ecological drainage method for purifying and reducing rainwater runoff of highways. Background technique [0002] At present, the total mileage of expressways in my country has exceeded 130,000 kilometers, resulting in a relatively large expressway pavement area and a large catchment surface. When it rains, the expressway pavement will collect a large amount of rainwater runoff, which needs to be controlled urgently. In addition, the frequent traffic volume on the expressway leads to the deposition of a large amount of pollutants on the road surface of the expressway. During the rainfall process, a large amount of pollutants deposited on the road surface, such as particulate matter, organic matter, nitrogen and phosphorus, and heavy metals, will be mixed into the rainwater runoff. The road surface runoff pollution of the expressway is very serious. If it is directly discharged into...

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned patents all involve the purification of rainwater from expressways, the "rainwater bioretention pond for phosphorus removal next to the expressway" only involves the purification and removal of phosphorus, which is too simple to completely remove pollutants in rainwater ; "A highway rainwater collection and purification system" has a complex structure and high cost, so it still needs to be improved

Images