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EcoTrack
How much water can your roof catch?
The harvestable volume is roof area × rainfall depth × a runoff coefficient (typically 0.8-0.9 for a hard roof, since some water evaporates or is lost to first-flush diversion) — even a modest roof and rainfall combine to surprisingly large volumes.
Rainwater harvesting sizing decisions (tank size, gutter capacity) all start from this number — knowing how much a single storm event can deliver prevents both undersized tanks (wasted runoff) and oversized ones (wasted cost).
Molar mass of any chemical formula (e.g. H2O, C6H12O6, Ca(OH)2).
OpenPercent composition of an element within a chemical formula.
OpenSimplest whole-number ratio formula from elemental masses or percentages.
OpenPercent yield from actual and theoretical reaction yields.
OpenHarvestable volume
3,187.5 L
What you entered
Volume = roof area × rainfall × runoff coefficient
150 m² × 0.025 m × 0.85= 3187.5 LResult
Harvestable volume: 3,187.5 L
A single rainfall of 25mm on this roof could yield about 3,188 liters of water.