Calculating headloss through a hydrant lateral

Product(s): WaterGEMS, WaterCAD
Version(s): 08.11.04.57 and later
Area: Modeling

Problem

How do WaterCAD and WaterGEMS calculate head losses through a hydrant lateral?

When choosing "true" for "Include Lateral Loss" for a hydrant, what friction coefficient is used to compute friction headlosses?

Problem ID#: 42960

Solution

Hydrant lateral losses are calculated by the pressure engine the same as any pipe (the lateral pipe is actually loaded into the model), 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

See Also

Product TechNotes and FAQs

SELECTsupport TechNotes And FAQs

WaterGEMS and WaterCAD TechNotes and FAQs

Junction vs. Hydrant

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