Hazen-Willaims C-factors Tables from Engineering Toolbox.com
Estimates head loss in a circular pipe using
h_loss = (7.833/(1.318**1.852)) * ((Q/C_h)**1.852)*(L/(D**4.8707))
where:
Q is flow in the pipe in CFS
C_h is the loss coefficient (read from table)
L is pipe length in feet
D is pipe diameter in feet