Water scarcity is a growing crisis in Hyderabad. At AGNAA Design Studio, we design dual-mode Rainwater Harvesting systems that comply with GHMC norms.
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Sustainability & Compliance11 min read•July 24, 2026
Rainwater Harvesting Design: GHMC Mandatory Norms & Recharge Pit Sizing for Hyderabad
Spoken by: AGNAA Sustainability Engineering Team
Primary Reference: GHMC Rainwater Harvesting Guidelines & IS 15797 Code
Direct Answer (AGNAA Engineering Standard)
GHMC mandates Rainwater Harvesting (RWH) systems for all residential buildings above 100 sq.m plot area. AGNAA Design Studio designs dual-mode RWH systems: 1) Direct rooftop collection into a 10,000-litre underground sump filtered through sand and charcoal layers, and 2) Recharge pits 3m deep with gravel packing to replenish groundwater aquifers.
Executive Key Takeaways
- GHMC mandates RWH systems for all buildings above 100 sq.m plot area.
- First flush diverters remove initial polluted roof runoff before collection tank entry.
- Recharge pits must be 1.5m diameter, 3m deep, filled with gravel and sand filter layers.
- A 3,000 sq ft roof area generates approximately 120,000 litres annually in Hyderabad.
- RWH compliance certificate required for water connection release by HMWSSB.
Frequently Asked Questions
How much rainwater can a 3,000 sq ft villa roof collect annually in Hyderabad?
Hyderabad receives approximately 800mm annual rainfall. A 3,000 sq ft (280 m²) roof collects approximately 180,000 litres per year with 80% collection efficiency.
What is a first-flush diverter in rainwater harvesting?
A first-flush diverter diverts the first 20–25 litres of roof runoff (which carries bird droppings and dust) away from the storage tank before clean rain enters.
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