Pipe Flow Rate (Hazen-Williams)
Hydraulics IS 1172:1993~2 min
Calculate flow rate and velocity in a pipe using the Hazen-Williams formula.
Formula
V = 0.8492 × C × R^0.63 × S^0.54
Input Parameters
PVC=150, Cast Iron=100, Old CI=80
Results
Hydraulic Radius (R)
0.0375m
Flow Velocity
0.737m/s
Flow Rate (Q)
13.02L/s
Flow Rate
46.87m³/hr
Step-by-Step Method
- 1Hydraulic radius R = D/4 for full pipe flow.
- 2Velocity V = 0.8492 × C × R^0.63 × S^0.54.
- 3Flow rate Q = V × A = V × π/4 × D².
Engineering Notes
- •C = 150 for PVC, 120 for new CI, 100 for old CI, 80 for very old CI.
- •Maximum velocity: 3 m/s for water mains.
Code Reference
IS 1172:1993
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