管径充满度DNh/D1000.51250.51500.62000.6半中心角θ1.5707961.5707961.3694381.369438水力半径水力坡降粗糙系数流速管材R（m）inv(m/s)0.0250.020铸铁管0.0130.9301040.031250.015混凝土管0.0140.8679290.0416470.010钢管0.0121.0012410.0555290.008塑料管0.0091.446488水流断面2A(m)0.0039270.0061360.0110710.019681流量流量3Q(m/s)Q(L/s)0.0036533.650.0053265.330.01108411.080.02846928.47
