Volumetric Flow Q where Hydraulic Slope S is 0.01, for selected Nominal Pipe Sizes (NPS) in PVC[14][15] NPS D S Re fD Q V in mm in[16] gpm lps ft/s m/s ½ 15 0.622 0.01 4467 5.08 0.9 0.055 0.928 0.283 ¾ 20 0.824 0.01 7301 5.45 2 0.120 1.144 0.349 1 25 1.049 0.01 11090 5.76 3.8 0.232 1.366 0.416 1½ 40 1.610 0.01 23121 6.32 12 0.743 1.855 0.565 2 50 2.067 0.01 35360 6.64 24 1.458 2.210 0.674 3 75 3.068 0.01 68868 7.15 70 4.215 2.899 0.884 4 100 4.026 0.01 108615 7.50 144 8.723 3.485 1.062 6 150 6.065 0.01 215001 8.03 430 26.013 4.579 1.396 8 200 7.981 0.01 338862 8.39 892 53.951 5.484 1.672 10 250 10.020 0.01 493357 8.68 1631 98.617 6.360 1.938 12 300 11.938 0.01 658254 8.90 2592 156.765 7.122 2.171