已知某设计管段L=100m,Q=50L/s,地面坡度i=0.001,上游管道管径D=
题型:单项选择题
问题:
已知某设计管段L=100m,Q=50L/s,地面坡度i=0.001,上游管道管径D=400mm,充满度h/D=0.60,上游管道的下端管底高程为43.52m,地面高程为46.22m,要求设计管段内充满度h/D=0.70,若上下游管道采用水面平接,则设计管段的管径应为______mm,上端管底高程应为______m。
A.400,43.41
B.400,42.51
C.500,42.51
D.500,43.41