InfoDrainage 2021.1 Help Documentation infodrainage2021v1

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The Colebrook-White Formula is used for Velocity calculations within the software


V = Velocity, (m/s)

g = Gravitational acceleration

S = Hydraulic gradient (m/m)

v = Kinematic viscosity of fluid (m²/s)

ks = Effective roughness

D = 4 * Hydraulic Radius (m)

Typical ks values for storm drainage are 0.6 mm and 1.5 mm for foul sewage pipes.


InfoDrainage uses a fixed viscosity value of 1 centistoke = 1E-06 m²/s