Intermediate storage can accept water on the supplier’s schedule and release it according to field operating requirements.
Canal deliveries and crop application do not always share the same timing or flow rate.
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.
The reservoir must cover the mismatch between incoming and outgoing hydrographs.
Reserve rules protect the system from delivery interruptions and forecasting errors.
Water quality, evaporation, residence time, and pumping may change after storage is introduced.
Turn the pain point into a defined operating question.
Model storage as a time series of inflow, application, losses, and minimum reserve rather than as capacity alone.
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.
Measure inflow and drawdown at intervals capable of showing peak mismatch.
What this analysis cannot establish by itself.
Storage shifts constraints; it does not remove supply limits or field-performance requirements.
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.