learn.howToCalculate
learn.whatIsHeading
Rainwater harvesting collects precipitation for irrigation, toilet flushing, or emergency use. It reduces groundwater demand and stormwater runoff.
公式
Calculate: Annual collection = Catchment area × Annual rainfall × Collection efficiency
ステップバイステップガイド
- 1Calculate: Annual collection = Catchment area × Annual rainfall × Collection efficiency
- 2Roof collection: 90% efficiency, pavement: 70%, storage needed for dry periods
- 31000 m² roof, 1 m rain: 700-900 m³ water available
解いた例
入力
Residential roof 100 m², annual rainfall 500 mm
結果
Annual collection ~45 m³ (45,000 L), covers 30-40% irrigation needs
Location dependent
避けるべきよくある間違い
- ✕Under-sizing tank for dry season needs
- ✕Forgetting overflow management (can cause flooding)
よくある質問
Is rainwater safe to drink?
No without treatment. Suitable for irrigation, toilet, washing after basic filtration.
How large must storage tank be?
Rule of thumb: volume for one dry month. Location's dry season determines sizing.
計算する準備はできましたか?無料の Rainwater Harvest 計算機をお試しください
自分で試してみる→