Calculations For Flow In Partially Filled Pipes - Global Water FP101 User Manual

C C a a l l c c u u l l a a t t i i o o n n s s f f o o r r F F l l o o w w i i n n P P a a r r t t i i a a l l l l y y F F i i l l l l e e d d P P i i p p e e s s
B C
0.010 0013
0.02 0.0037
0.03 0.0069
0.04 0.0105
0.05 0.0147
0.06 0.0192
0.07 0.0242
0.08 0.0294
0.09 0.0350
0.10 0.0409
0.11 0.0470
0.12 0.0534
0.13 0.0600
0.14 0.0668
0.15 0.0739
0.16 0.0811
0.17 0.0885
0.18 0.0961
0.19 0.1039
0.20 0.1118
0.21 0.1199
0.22 0.1281
0.23 0.1365
0.24 0.1449
0.25 0.1535
0.26 0.1623
0.27 0.1711
0.28 0.1800
0.29 0.1890
0.30 0.1982
0.31 0.2074
0.32 0.2167
0.33 0.2266
0.34 0.2355
0.35 0.2450
0.36 0.2546
0.37 0.2644
0.38 0.2743
0.39 0.2836
0.40 0.2934
0.41 0.3032
0.42 0.3130
0.43 0.3229
0.44 0.3328
0.45 0.3428
0.46 0.3527
0.47 0.3627
0.48 0.3727
0.49 0.3827
0.50 0.3927
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B C
0.51 0.4027
0.52 0.4127
0.53 0.4227
0.54 0.4327
0.55 0.4426
0.56 0.4526
0.57 0.4625
0.58 0.4723
0.59 0.4822
0.60 0.4920
0.61 0.5018
0.62 0.5115
0.63 0.5212
0.64 0.5308
0.65 0.5404
0.66 0.5499
0.67 0.5594
0.68 0.5687
0.69 0.5780
0.70 0.5872
0.71 0.5964
0.72 0.6054
0.73 0.6143
0.74 0.6231
0.75 0.6318
0.76 0.6404
0.77 0.6489
0.78 0.6573
0.79 0.6655
0.80 0.6736
0.81 0.6815
0.82 0.6893
0.83 0.6969
0.84 0.7043
0.85 0.7115
0.86 0.7186
0.87 0.7254
0.88 0.7320
0.89 0.7384
0.90 0.7445
0.91 0.7504
0.92 0.7560
0.93 0.7612
0.94 0.7662
0.95 0.7707
0.96 0.7749
0.97 0.7785
0.98 0.7816
0.99 0.7841
1.00 0.7854
FP101/FP201 - 6
Global Water Instrumentation, Inc.
H= Height of water; D= Diameter of pipe
(in feet)
H/D = Column B
Read Column C adjacent to your pipe's B
C x D 2 = Filled area, A (sq. ft.)
A x Average Velocity = Volumetric flow
(CFS)
CFS x 448.83 = Gallons/minute (GPM)
GPM x 1440 = Gallons/day (GPD)
Round Pipe
D
H