Calculation method of composite runoff coefficient for sponge city design of building and sub-district
LI Jing1,,, YANG Yunli1, MAO Yi2 1.Zhongnan Architecture Design Institute Co. Ltd., Wuhan 430071, China 2.Wuhan Municipal Engineering Design & Research Institute Co. Ltd., Wuhan 430071, China
Abstract:In order to solve the current comprehensive problems of urban water environment pollution and waterlogging control, the construction of sponge cities should be systematically promoted. The building and sub-district is the core link of the source control in the sponge city construction, and the design of the relevant rainwater drainage system should be well done. A common measure in the sponge city design of building and sub-district is rainfall disconnection. From the basic definition of rainfall runoff coefficient, this article analyzed the changes in rainfall runoff coefficients of the disconnected and non-disconnected scenarios of the combined sites under different rainfall conditions. And an improved calculation formula of composite runoff coefficient and the quantitative calculation methods for its key values were proposed, such as the rainfall infiltration of the underlying surface (H0) and the adjustment value of rainfall runoff coefficient (k). This research has a positive effect on the promotion of non-regulated storage measures such as disconnection and vertical optimization of the site, and provides a reference for better integration of the sponge city design into building and sub-district. Key words:sponge city/ building and sub-district/ composite runoff coefficient/ calculation method/ rainfall disconnection.
图1海绵设施下垫面雨水径流示意图 Figure1.Sketch of runoff on underlying surface of sponge facilities
下载: 导出CSV 表3径流调整系数k Table3.Adjustment value of rainfall runoff coefficient k
Fa/Fb
b下垫面断接 时的场均雨量 径流系数
b下垫面不断接 时的场均雨量 径流系数
径流调整 系数k
4.00
0.43
0.90
0.48
2.00
0.46
0.90
0.51
1.50
0.48
0.90
0.53
1.00
0.51
0.90
0.57
0.75
0.54
0.90
0.6
0.50
0.59
0.90
0.65
0.25
0.68
0.90
0.75
Fa/Fb
b下垫面断接 时的场均雨量 径流系数
b下垫面不断接 时的场均雨量 径流系数
径流调整 系数k
4.00
0.43
0.90
0.48
2.00
0.46
0.90
0.51
1.50
0.48
0.90
0.53
1.00
0.51
0.90
0.57
0.75
0.54
0.90
0.6
0.50
0.59
0.90
0.65
0.25
0.68
0.90
0.75
下载: 导出CSV 表4组合下垫面断接与非断接综合雨量径流系数对比结果 Table4.Comparing results of composite runoff coefficient of combined underlying surface with and without disconnection
下载: 导出CSV 表5组合下垫面(Ha0=6 mm，Hb0=0.7 mm)断接与非断接综合雨量径流系数对比结果 Table5.Comparing results of composite runoff coefficient of combined underlying surface (Ha0=6 mm, Hb0=0.7 mm) with and without disconnection
1.Zhongnan Architecture Design Institute Co. Ltd., Wuhan 430071, China 2.Wuhan Municipal Engineering Design & Research Institute Co. Ltd., Wuhan 430071, China Received Date: 2019-11-25 Accepted Date: 2020-05-06 Available Online: 2020-10-14 Keywords:sponge city/ building and sub-district/ composite runoff coefficient/ calculation method/ rainfall disconnection Abstract:In order to solve the current comprehensive problems of urban water environment pollution and waterlogging control, the construction of sponge cities should be systematically promoted. The building and sub-district is the core link of the source control in the sponge city construction, and the design of the relevant rainwater drainage system should be well done. A common measure in the sponge city design of building and sub-district is rainfall disconnection. From the basic definition of rainfall runoff coefficient, this article analyzed the changes in rainfall runoff coefficients of the disconnected and non-disconnected scenarios of the combined sites under different rainfall conditions. And an improved calculation formula of composite runoff coefficient and the quantitative calculation methods for its key values were proposed, such as the rainfall infiltration of the underlying surface (H0) and the adjustment value of rainfall runoff coefficient (k). This research has a positive effect on the promotion of non-regulated storage measures such as disconnection and vertical optimization of the site, and provides a reference for better integration of the sponge city design into building and sub-district.
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