What is a more rugged trip: Alaska or Boston?
1 meter 3.2809 feet 3.2809 ft X lbf/ft² / 62.4 lbm/ft³ 3.2809 ft x 62.4 lbm/ft³ 204.72816 lbf/ft² 204.72816 lbf/ft² / 144 in²/ 1 ft² 1.421723 lbf/in² Since there is a hydrostatic head of 1.421723 psi per meter of elevation, they want a 4 psi increase per meter elevation to ensure sufficient flow and to take into account any minor additional head losses (due to piping length and any equivalent lengths for fittings and friction factor) to the point of delivery. The diameter is important due to friction head losses over a long length of pipeline and the Darcy-Weisbach equation applies. I responded to a similar inquiry regarding static head loss over a long length of pipeline. Edit: I forgot to mention that there are many tables which apply Hazen-Williams equation for head losses specifically for water piping systems. This approach is probably more appropriate for your water delivery design work. Both the Darcy-Weisbach and Hazen-Williams equations require the inside pipe diameter.
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