From rainfall depth to catchment volume: keep the units visible

Blank worksheet and worked example
Boundary and original area: __________________________
Period: __________________________
Depth source and representativeness: __________________________
Depth in metres: __________________________
Area in square metres: __________________________
Volume / exclusions: __________________________

Completed example
Boundary and original area: Fictional 2 km² catchment
Period: One agreed teaching period
Depth source and representativeness: Assumed uniform 100 mm
Depth in metres: 0.1 m
Area in square metres: 2,000,000 m²
Volume / exclusions: 200,000 m³; runoff not calculated

Depth: 100 mm = 0.1 m / Area: 2 km² = 2,000,000 m² / Rainfall volume: 200,000 m³; not runoff