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Calculation method of rainwater design discharge under the condition of constant non-uniform flow

A design flow and non-uniform flow technology, applied in the direction of calculation, instrumentation, geometric CAD, etc., to achieve the effect of improving applicability, large social and economic benefits, and clear concepts

Active Publication Date: 2018-12-11
杜曲
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Problems solved by technology

Since the constant uniform flow is a special case of the constant non-uniform flow, it is difficult for the drainage channel to produce the condition of the constant uniform flow during the rainstorm, but the condition of the constant non-uniform flow is very common. Therefore, when the drainage channel is constant In the case of non-uniform flow conditions, the constant uniform flow conditions are still used to calculate the rainwater design flow rate and the total head at the upstream end of the pipe section, which will inevitably produce large calculation deviations

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Embodiment Construction

[0012] The method of the present invention will be further described below with specific examples, but the present invention is not limited to the following examples.

[0013] The known conditions for designing a drainage pipe in a certain area: the rainwater collection area at the upstream entrance of the drainage pipe is F=22.88ha, the length of the pipe section dL=300m, the roughness coefficient of the reinforced concrete drainage pipe is n=0.014, and the comprehensive runoff coefficient of the rainwater collection area ψ=0.709, coefficient A=1327.817, constant b=3.105, exponent m=0.295 of design rainstorm intensity q, design pipe bottom slope j is selected according to the minimum value allowed by the code according to pipe diameter D, drainage pipe cross-sectional area W=0.7854 D. 2 , hydraulic radius R=0.25D, design water level Z at the downstream end of the pipe section 下 =3.40m, the highest water level Z allowed at the upstream end 上允许 = 3.45m, the ground water colle...

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Abstract

The invention relates to the prevention and control technical field of urban water-logging and particularly relates to a method for calculating the rainwater design discharge based on a rational formula in the constant and non-uniform flow condition. According to the invention, based on known design conditions, such as the water-collecting area F of a drain pipe, the length dL of a pipe section, the roughness coefficient n, the comprehensive runoff coefficient Psi, the pertinent parameters of the design rainstorm intensity q, the ground water catchment time t1, the pipe bottom gradient j, the section downstream-end gross head Z lower limit, the upstream-end allowable gross head Z upper limit, the preliminarily proposed diameter D of the drain pipe and the like, the rainwater design discharge Qs, the upstream-end allowable gross head Z upper limit and the diameter D of the drain pipe can be quickly determined through the iterative flow velocity V method.

Description

technical field [0001] The invention relates to the technical field of urban waterlogging prevention and control, in particular to a calculation method for rainwater design flow under constant non-uniform flow conditions. Background of the invention [0002] In recent years, with the rapid development of urbanization in our country, there have been frequent occurrences of urban waterlogging disasters, ranging from traffic jams to threats to citizens' property and even life safety. The reason is that in addition to the fact that urban drainage hardware facilities do not meet the needs of the development of the situation, the theory of production and confluence does not meet the needs of the development of the situation is also an important factor. For example, the method of calculating the design flow of rainwater under the condition of constant uniform flow is not suitable for the case of downstream water level jacking. [0003] According to the "Code for Design of Outdoor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 杜佐道杜曲皮凌华
Owner 杜曲
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