Energy per acre-foot follows from the work required to lift and pressurize water, adjusted for losses and equipment efficiency.
The same volume can require radically different energy because elevation, pressure, friction, treatment, and pump efficiency differ.
That distinction matters because irrigation decisions cross several boundaries: a water record becomes a physical delivery, a delivery becomes a hydraulic condition, and that condition becomes a root-zone response. A number at one boundary cannot automatically prove performance at the next.
The mechanisms to keep visible.
Static lift establishes the elevation component of total dynamic head.
Operating pressure adds head even when source and field elevations are similar.
Poor efficiency and friction increase input energy without increasing useful delivery.
Turn the pain point into a defined operating question.
Calculate lift and pressure separately, then document efficiency, friction, treatment, and runtime assumptions.
Start with the decision the analysis must support. Then identify the smallest set of inputs capable of changing that decision. Keep source facts, calculations, model outputs, estimates, and operator observations distinct throughout the workflow.
Make the result reviewable.
Report total dynamic head, pump efficiency, kilowatt-hours, and uncertainty alongside the volume.
What this analysis cannot establish by itself.
A planning calculation cannot replace a pump test, power meter, or verified duty curve.
SIM treats an honest limitation as part of the result. Where evidence is incomplete, the correct status is inconclusive or unverified—not a more confident sentence.