Flood drainage planning and designing method for non-plain cities

Abstract

The invention relates to the technical field of flood drainage of cities, in particular a flood drainage planning and designing method for non-plain cities, which comprises the following steps of: determining a city flood drainage planning recurrence interval according to the importance of a city and a city flood drainage catchment area; calculating a peak discharge of an inland river catchment; dividing the catchment area of the inland river into an upstream suburban area and a downstream urban area, respectively calculating an upstream peak discharge and a downstream urban area peak discharge, and adding the upstream peak discharge and the downstream urban area peak discharge to obtain an overall inland river catchment peak discharge; determining a city flood drainage scheme; determining a water surface profile of the inland river; and combining the flood draining planning with a city vertical planning and a draining planning, and when the water level of the inland river reaches the highest point, controlling a control elevation of the lowest point of the non-plain city to be not smaller than the water level elevation of the backwater of a rainwater draining system at the lowest point. The method has the advantages of contribution to discharging flood of the inland river of the non-plain city, and preventing the occurrence of inland inundation in the urban area.

Description

technical field [0001] The invention relates to the technical field of urban flood drainage, in particular to a non-plain urban flood planning and design method. Background technique [0002] As the guarantee of urban sustainable development, the flood control and drainage planning system plays an increasingly prominent role in urban construction, especially in non-plain cities where the upper reaches of urban inland rivers are mountainous or hilly, and their flood control and drainage planning has its distinctive characteristics. [0003] First of all, because all or part of the mountain torrents in the upper reaches of the city are discharged into the outer river through the inner river of the city, and the phenomenon of "rainlogging" is not allowed in the city during the planning recurrence period, the mountain torrents entering the city and the rainwater flood peaks generated inside the city must be eliminated in time. Therefore, The traditional concept of "waterlogging ...

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Problems solved by technology

(2) In the construction and development process of the urban planning period, due to the timing of construction, some areas have not yet been constructed to the flood discharge standard of planning and design, resulting in "waterlogging"

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