কীভাবে Rainwater Harvest গণনা করবেন
Rainwater Harvest কি?
Rainwater harvesting collects precipitation for irrigation, toilet flushing, or emergency use. It reduces groundwater demand and stormwater runoff.
সূত্র
Calculate: Annual collection = Catchment area × Annual rainfall × Collection efficiency
ধাপে ধাপে নির্দেশিকা
- 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
সমাধান করা উদাহরণ
ইনপুট
Residential roof 100 m², annual rainfall 500 mm
ফলাফল
Annual collection ~45 m³ (45,000 L), covers 30-40% irrigation needs
Location dependent
এড়ানোর সাধারণ ভুল
- ✕Under-sizing tank for dry season needs
- ✕Forgetting overflow management (can cause flooding)
সচরাচর জিজ্ঞাসা
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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