Where:
CHW - Hazen-Williams correction factor
hl - headloss
ε - pipe roughness
d - diameter
Re - Reynolds number
G - gravity
Q - flow rate
L - length
V - fluid viscosity
f - friction factor
Type I:
Calculates hl given Q, ε, d and L
Swamee & Jain developed equation:
 
Darcy - Weisbach equation:

Type II:
Calculates Q given (ε/d), hl, L and d
Swamee & Jain developed equation:

Colebrook formula:

Type III:
Calculates d given Q, L, hl, ε
Swamee and Jain developed equation

Hazen Williams I:
Calculates hl given Q, ε, d and L
Hazen Williams equation:

Hazen Williams II:
Calculates Q given (ε/d), hl, L and d
Hazen - Willaims equation:

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