This is a simplified arithmetic scenario, not advice about potable water, structural loading, equipment, water quality, permits, or legal compliance. Verify assumptions with product documentation and qualified local professionals.

Time stepCatchment areaArea unitRunoff coefficientRainfall unitVolume unitFirst flush per wet stepTank capacityInitial volumeFixed leakage / evaporation per stepStorage loss % per stepDefault demand per step (selected volume unit)Reserve floorOverflow destinationMissing-value policyScenario name

Series CSV: period,rainfall,demand (blank demand uses default first; blank rainfall remains missing)

Maximum 2 MiB. Rows are simulated chronologically; date gaps are not synthesized.

Import scenario JSON

Simulation results

Period	Rain	Start	Gross capture	First flush	Captured after flush	Other loss	Demand	Served	Unmet	End	Overflow	Residual

Rainwater Harvest Planner

Simulation results

Assumptions and findings