Ecological drainage method for purifying and decreasing rainwater runoffs on expressways

Abstract

An ecological drainage method for purifying and decreasing rainwater runoffs on expressways comprises the following steps: designing drain ditches on two sides of an express way into structures havinginfiltrate-storing, purifying and draining functions, providing pebble shallow ditches, in natural lap joint with the expressway, on two sides of the expressway so as to intercept and filter particulate pollutants in pavement rainwater runoffs and reduce erosion of the pavement rainwater runoffs upon subsequent measures; setting a vegetation filter belt, in linkage with each pebble shallow ditch,beside the pebble shallow ditch to perform vegetation filtering and absorbing of rainwater, soil absorbing and permeating, and microbial degradation; setting a depression behind each vegetation filter belt. Expressway rainwater runoff quality can be further improved under the various actions such as physical action, chemical action and biochemical action, peak time of runoffs is extended, and peak value and runoff quantity are decreased. Expressway rainwater runoffs and pollution are effectively controlled from the source, and a feasible route to construct environment-friendly resource-savingexpressways is provided.

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...

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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

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