Multistage distributed type urban rainwater comprehensive utilization system and construction method therefor

Abstract

The invention discloses a multistage distributed type urban rainwater comprehensive utilization system and a construction method therefor. Firstly, the system divides house buildings, roads and greenbelts into a plurality of independent rainwater collection and utilization subsystems according to different underlying surface types, and each independent rainwater collection and utilization subsystem only needs to treat rainwater in the area to form a distributed type rainwater collection system, so that peak elimination from the source is realized; then excessive rainwater exceeding the storageload of each independent rainwater collection and utilization subsystem is conveyed to large regulation and storage facilities such as an artificial wetland through a pipe duct and a pump station forwater quality improvement and utilization; and finally, all the independent rainwater collection and utilization subsystems are in communication, and excessive rainwater of the distributed unit system is discharged into water bodies such as rivers and lakes for comprehensive regulation and storage. According to the system, the operation pressure caused by centralized rainfall on a rainwater pipenetwork is reduced, the rainwater zoning collection and utilization efficiency and the purification capability are improved, and the urban water environment is improved.

Description

technical field [0001] The invention relates to the technical field of rainwater comprehensive utilization, in particular to a sponge city rainwater comprehensive utilization system and a construction method thereof. Background technique [0002] In the process of traditional urban construction, most of the areas such as green spaces, wetlands, and ditches that originally had the function of water conservation have evolved into hardened road surfaces; during heavy rains and heavy rains, they mainly rely on pipes, pumping stations, sewer pipe networks and other facilities for drainage, which cannot be infiltrated to the ground, resulting in frequent waterlogging disasters and serious runoff pollution; and after the heavy rain, it fell into the predicament of dryness and water shortage. The current urban water ecology is facing increasingly serious contradictions between severe water shortages during drought periods and large amounts of rainwater being discharged outside durin...

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Problems solved by technology

[0004] Conventional urban rainwater harvesting and utilization systems take "quick drainage" and "centralized terminal control" as the main planning and design concepts, and there are many deficiencies: (1) The functions of rainwater collection and rainwater purification are not well connected with various comprehensive functions, Rainwater resources cannot be fully utilized; (2) Natural rainwater often carries a large amount of pollutants and household garbage, and direct drainage of rainwater to natural environmental water bodies will aggravate the pollution of natural water bodies; (3) Surface runoff increases significantly during heavy rains, and municipal rainwater pipe network drainage Insufficient capacity, causing floods; (4) Conventional rainwater purification systems centrally process rainwater through the pipe network, resulting in high purification costs and low operating efficiency

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