1、钢筋混凝土圆管非满流水力计算
计算公式
流量Q=v*A m3/s
流速v=(R2/3*i1/2)/n m/s h＜D/2时面积A＝（θ-SinθCosθ）r2m2湿周ρ=2θr m 水力半径R=（θ-SinθCosθ）r/2θm h＞D/2时面积A＝（π-θ+SinθCosθ）r2m2湿周ρ=2（π-θ）r m 水力半径R=（π-θ+SinθCosθ）r/2（π-θ）m 充满度=h/D
表一：不同充满度时R、θ值
管径(mm)0000000500500水力坡降0.00390.00390.0040.00390.00390.00390.00390.00390.003粗糙系数0.0130.0130.0130.0130.0130.0130.0130.0130.013 h/D0.10.20.30.40.50.60.70.80.9角度θ36.835366.578.59078.566.55336.83 sinθ0.59940.79860.91710.979910.97990.91710.79860.5994 cosθ0.80040.60180.39870.19946E-170.19940.39870.60180.8004以弧度计0.64270.9249 1.1604 1.3698 1.5705 1.3698 1.16040.92490.6427半径系数0.1230.240.340.430.50.5550.590.6080.596水力半径R(m)00000000.1520.149流速v（m/s）0000000 1.3682 1.1842 A（m2）00000000.16850.1861流量Q（m3/s）00000000.23050.2203流量Q（m3/h）0000000829.89793.21流量Q（m3/d）00000001991719037