| Product(s): | WaterGEMS, WaterCAD |
| Version(s): | CONNECT Edition, V8i (08.11.04.57 and later) |
| Area: | Calculations |
Problem
How do WaterCAD and WaterGEMS calculate head losses through a hydrant lateral, when using the lateral option built into the hydrant properties?
When choosing "true" for "Include Lateral Loss" for a hydrant, what friction coefficient is used to compute friction headlosses?
Solution
Hydrant lateral losses are calculated the same as any pipe (internally the numerical solver models an actual pipe for the hydrant lateral), using the supplied lateral diameter, minor loss coefficient and length. Additionally, the engine assumes the following friction coefficient values:
- Darcy Weisbach e: 0.0009
- Hazen Williams C: 130.0
- Mannings n: 0.012
The calculated results at a hydrant (such as pressure) account for these lateral losses, if used.