Recharge type urban rainwater flood comprehensive utilization system

Abstract

A recharge type urban rainwater flood comprehensive utilization system is capable of meeting urban ecological water utilization requirements and sustainably regulating urban rainwater systems, is system engineering giving priority to rainwater storage and equipped with retention and water storage facilities and can be widely used for the field of urban rainwater flood utilization and groundwater recharge. According to monitoring of the underground water level and underground funnels and analysis on rainfall and confluence, key recharge areas are determined, and depression soakaway pits, seepage wells and deep recharge wells are arranged reasonably, so that rainwater is retained dispersedly and recharged insitu. By means of connection among permeation pipelines, underground rivers and open channels and by the aid of manual control measures of gates, water pumps and the like, a water body can flow in a connecting loop, and accordingly recharge time is prolonged, self-cleaning capacity of the rainwater is enhanced and contradiction between high rainwater flood generation speed and seepage recharge slowness is effectively overcome. Comprehensive regulation of the urban rainwater, surface water and underground water is achieved by combining groundwater recharge with planning of earth surface lake water systems, so that investment in engineering facilities is lowered, and disasters of surface subsidence and the like caused by groundwater recession are effectively relieved. Retention and regulation capabilities are enhanced by building a water ecologically-friendly park on the loop, and the goal of ecological city construction is promoted by means of combining the water ecologically-friendly park with construction of surface water systems and ecological river embankments on two banks.

Description

technical field [0001] The invention is a comprehensive system for jointly regulating urban rainwater, surface water and groundwater, and utilizing urban rainwater to recharge groundwater. Background technique [0002] At present, the recharge and reuse of underground aquifers is commonly known as ASR (Aquifer storage and recovery) technology in the world. ASR technology has developed into a recharge process of "collection-pretreatment-recharge-extraction-reuse", including the surface Infiltration, pond infiltration, infiltration well infiltration, horizontal radiation well infiltration, pressurized artificial recharge well and other main recharge facilities. The existing urban rainwater utilization is through the combination of depressions-seepage canals, seepage canals-seepage pipes, depressions-seepage trenches-rainwater drainage systems, etc., and comprehensive test points including rainwater collection, treatment, storage, discharge, irrigation and water intake are esta...

AI Technical Summary

Problems solved by technology

However, these experimental sites are mainly aimed at a specific area of ​​the city, without considering the overall planning of the city, and are not systematic

[0003] In addition, the density of urban buildings increases, the road surface hardens, the permeable area decreases, and the design of green spaces is higher than the ground, etc., which increases the surface runoff coefficient in the region and accelerates the regional confluence speed. The growing flood peak cannot be effectively regulated and stored, and urban stormwater is still discharged in large quantities, resulting in a great waste of resources

Most of these projects are stored in still water, the water body is seriously polluted, the investment in engineering facilities is large, the utilization efficiency is low, and it is difficult to meet the urban ecological landscape water use.

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