Catchment runoff and rainwater potential calculator.
Estimate annual water potential from catchment, rainfall and runoff coefficient.
Catchment runoff and rainwater potential inputs
Rainfall is variable. First-flush loss, evaporation, storage overflow, infiltration and collection efficiency can reduce recoverable volume.
Method: The calculator applies entered dimensions, flows and efficiencies as a transparent farm-planning estimate.
Inputs used: Catchment area = 1,000 m²; Annual rainfall = 800 mm; Runoff coefficient = 0.8
Assumptions: The result uses the values, units and options shown in the input snapshot.
Scope and warnings: Rainfall is variable. First-flush loss, evaporation, storage overflow, infiltration and collection efficiency can reduce recoverable volume. Rounding and excluded real-world terms can make an external result differ.
How this catchment runoff and rainwater potential calculator works
The calculator applies entered dimensions, flows and efficiencies as a transparent farm-planning estimate.
A worked example
Use measured site values to explore a realistic irrigation or harvesting scenario.
Is this a final hydraulic design?
No. Site elevations, equipment curves, pipe data, water quality and local rules require qualified design.
Calculations run on your device. Review your results before exporting or sharing them.
Use local rainfall and surface type
Runoff coefficients must match roof, paved or land surface conditions.
Rainfall variability and first-flush losses affect actual harvest.
Published by ToolMitra — methods and editorial approach.