某厂房设计降雨强度q=478L/(s·h㎡),屋面径流系数w=0.9,拟用屋面结

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问题 某厂房设计降雨强度q=478L/(s·h㎡),屋面径流系数w=0.9,拟用屋面结构形成的矩形凹槽做排水天沟,其宽B=0.6m,高H=0.3m,设计水深h取0.15m,天沟水流速度V=0.6m/s,则天沟的最大允许汇水面积应为以下何项?(  )A.125.52㎡B.251.05㎡C.1255.23㎡D.2510.46㎡

选项 A.125.52㎡
B.251.05㎡
C.1255.23㎡
D.2510.46㎡

答案 C

解析 天沟允许通过的流量:0.6×0.15×0.6=54L/s则478×0.9×F=54,得F=0.125523公顷=1255.23㎡
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