如何计算Rainwater Harvest
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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
分步指南
- 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
例题解析
输入
Residential roof 100 m², annual rainfall 500 mm
结果
Annual collection ~45 m³ (45,000 L), covers 30-40% irrigation needs
Location dependent
常见错误注意事项
- ✕Under-sizing tank for dry season needs
- ✕Forgetting overflow management (can cause flooding)
常见问题
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.
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