The friction head loss is calculated using the Darcy-Weisbach equation:

): Pressure lost as water travels through pipes and fittings. The pressure needed at the outlet (e.g., 25–50 PSI). Existing Supply Pressure ( Hsupplycap H sub s u p p l y end-sub

Using the calculations above, we get:

The vertical distance the water must be lifted from the source to the highest discharge point. Friction Head ( cap H sub f

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Here is an interesting post built around that concept, suitable for a professional network like LinkedIn or an engineering forum.