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Dear John Cody,

Thank you for the information on Gravity Water Flow System, we do solar water pump installations from Lorentz water pump manufacturer. The way we calculate static head is putting all our estimates measurements is from the Lorentz Compass software system to peak the exact pump for the project. The total dynamic head (TDH)Distance from the well depth to the higher point of water delivery tank. Howerver an overview of the design process found at https://www.ircwash.org/sites/default/... is very helpful and I am grateful to be part of this great network. Regards, Victor K. Noubibou WaterSunLife