Storm Drains Junctions Losses Calculation
- hj = junction head loss (ft. or m)
- Q = flow (cfs or m3/s)
- v = velocity (fps or m/s)
- A = cross-sectional area (sq. ft. or m2)
- = angle in degrees of lateral with respect to centerline of outlet pipe
g = gravitational acceleration = 32.2 ft/s2 or 9.81 m/s2.
The above equation applies only if vo > vi and assumes that Qo = Qi + Q1.