Construction method of urban-scale superficial flow rainwater drainage system

Abstract

The invention provides a construction method of an urban-scale superficial flow rainwater drainage system, and relates to the technical field of urban drainage. The construction method comprises the following steps: establishing a three-dimensional geographic model of a planning area; determining a confluence path of the planning area and forming a plurality of small micro-watershed units according to the confluence path; determining a target water storage amount and a target water discharge amount of the planning area by analyzing hydrological characteristics of the planning area before and after development; constructing a superficial flow rainwater drainage system in each small and micro-watershed unit, wherein the superficial flow rainwater drainage system comprises a site, a municipal road and a river channel green gallery superficial flow drainage system which are connected in sequence; and carrying out analogue simulation analysis on the system, and adjusting the superficial flow rainwater drainage system according to a result until the superficial flow rainwater drainage system reaches a target discharge amount. The method takes the principle of retaining natural hydrological characteristics to the greatest extent, has the advantages of short flow, superficial flow, smooth connection, purification and the like, can effectively reduce the urban waterlogging risk and reduce urban non-point source pollution, and has high feasibility and superiority.

Description

technical field [0001] The invention relates to the technical field of urban planning, in particular to a method for constructing a city-scale shallow-flow rainwater drainage system. Background technique [0002] The traditional urban rainwater drainage system is mainly to artificially guide rainwater to the underground pipe network system, and finally discharge the river water system. Stormwater systems are designed to channel all stormwater within city limits as quickly and efficiently as possible. However, with the process of urbanization, the surface runoff increases, the flood peak flow increases, the flood peak time advances, and the natural groundwater supply decreases. It is difficult to fundamentally solve the current waterlogging disasters that cities are facing by simply expanding the section of stormwater pipes and canals. Eco-environmental problems such as mixed flow pollution with rain and sewage. It can be seen that the existing rainwater pipe network system...

AI Technical Summary

Problems solved by technology

The current rainwater drainage system usually relies on the determined urban planning land, road network layout and vertical direction to carry out the planning and design of river network water system and rainwater pipeline. Cutting bends and straightening, cutting and merging led to the extension of the rainwater collection process, the scale of the rainwater pipeline continued to increase, and its buried depth also continued to deepen, which further led to the need for the downstream river system to increase the depth of the river bottom to meet the discharge requirements of the rainwater pipe network. Compared with the natural state before urban development and construction, not only the drainage capacity is reduced, it is easy to form waterlogging, but also the water system is narrow and deep with steep slopes, and the overall landscape quality and hydrophilicity are greatly reduced

Although the existing technology has carried out local expansion and storage improvement on the rainwater system, it still uses long-distance underground rainwater pipelines to collect and discharge rainwater in essence, and still has the above-mentioned technical shortcomings.

[0005] (2) The existing rainwater drainage system is parallel to the sewage drainage system, which is easy to mix and connect

At present, the problem of misconnection between rainwater and sewage pipe networks is common and exists in large numbers in old and new urban areas. Even the existing rainwater and sewage misconnection reconstruction technology is limited by the accuracy of pipe network investigation, renovation space, and construction quality. Due to objective conditions, it is impossible to completely divert rain and sewage, and there is still a risk of pollution to the water quality of the terminal receiving water body

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