Rain · sizing a rainwater system for a vegetable garden

Location

Detecting your location…

Annual rainfall

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mm / year, 5-yr avg

Driest month

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Peak ET₀

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mm in the hottest month

Growing-season deficit

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mm of irrigation needed

Inputs

Garden area

70 m²

Roof catchment

100 m²

Storage tank

10,000 L

Garden practice

Heavy mulching cuts soil evaporation ~30% — Drip irrigation vs. watering can / sprinkler, ~20% —

Modelling

Stress-test against the driest year on record

Calculating…

Self-sufficient years

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Total shortfall, worst year

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End-of-summer reserve

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Overflow lost to ground

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Each line is one of the last 5 years. Where lines hit the bottom, the garden ran dry.

Click anywhere on the field to pick a combination. Darker = more reliable across recent years.

Rainfall captured by the roof versus what the garden draws, averaged across the period.