INTRODUCTION AND NOTES ON USE
- Select DN from the drop down boxes for Nominal Diameter. Mean Internal Diameter* (mm) will be automatically selected.
- Insert Headloss Gradient S (m/km).
- Insert Roughness k (mm). NOTE: Left mouse button click outside the data entry box, or hitting the TAB key will register data.
- Output: Velocity v (m/s) and Discharge Q (L/s).
The Calculations are derived from the following Colebrook-White equation:
v = -2 (2 g D S)0.5 log(k/3.7/D + 2.51ν/D/(2 g D S)0.5)
Where
g = Gravitational acceleration, 9.81 m/s/s
D = Mean Internal Diameter*, mm
S = Slope, m/km
k = Colebrook-White roughness coefficient, mm
ν = Kinematic viscosity of water, 1.14E -06 m2/s
v = Flow velocity, m/s
Q = Discharge, L/s
