This document discusses water pumping systems and provides examples of calculating head, flow rate, power requirements, and pump sizing. It covers topics like centrifugal pumps, elevated tank systems, direct boosting systems, pressure tank systems, precharge hydro-pneumatic systems, and designing a water pumping system for a residential development. Examples are provided to demonstrate how to calculate total dynamic head, power in kW required for a given flow rate and head, and selecting an appropriately sized pump.