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[单选题]
某土石坝工程施工高程超过上游围堰顶高程,其相应的拦洪库容为0.8亿m³,该坝施工期临时度汛的洪水标准应为()年一遇。
A.20-50
B.50-100
C.100-200
D.200-300
查看答案
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A.20-50
B.50-100
C.100-200
D.200-300
A.≥100
B.100~50
C.50~20
D.20~10
A.31.0m
B.31.5m
C.31.6m
D.31.7m
A.36.0m
B.36.5m
C.36.6m
D.37.1m
A.31.Om
B.31.5m
C.31.6m
D.32.1m
某河中筑有单孔溢流坝如图所示。剖面按WES曲线设计。已知筑坝处的河底高程为12.20m,坝顶高程为20.00m,上游设计水位高程为21.31m,下游水位高程为16.35m,坝前河道近似矩形,河宽100m,边墩头部呈圆弧形,试求上游为设计水位时,通过流量Q=100m3/s所需的堰顶宽度b。
A.2498.36
B.2801.79
C.2701.79
D.2598.36