20141016IES_Pivot Low Pressure Drains_Demand Savings.docx

D1 = kW savings for replacing pivot low pressure drains
D2 = Estimated leaking flow rate per drain (4 gpm)
D3 = Average pump operating pressure (65 psi)
D4 = Average pumping plant efficiency (60% or 0.6)
D5 = factor to average demand savings from the irrigation season over the entire year (5/12)
Equation Constants
Conversion factor from psi to feet of head = 2.31
Conversion factor from hp to kW = 0.746
Units conversion factor for water horsepower calculation = 3,960