Rainwater Harvesting System
Aquatic Solutions
Rainwater Harvesting System
Complete rainwater harvesting systems for rooftop collection, surface runoff capture, and groundwater recharge — reducing water bills, meeting CGWA compliance, and building water resilience.
Overview
Rainwater harvesting (RWH) is the collection and storage of rainwater from rooftops, paved surfaces, and open areas for direct use or groundwater recharge. With India facing increasing water stress and the Central Ground Water Authority (CGWA) mandating RWH for buildings above a certain size in notified areas, rainwater harvesting is both an environmental responsibility and a regulatory requirement. A well-designed RWH system can meet 20–40% of a building's water demand.
Aquatic Solutions designs and installs complete rainwater harvesting systems including rooftop collection systems with first-flush diverters, storage tanks, filtration units, and groundwater recharge structures (recharge pits, percolation wells, and injection wells). Our systems are designed to maximise rainwater capture, ensure water quality, and comply with CGWA, BIS IS 15797, and local municipal regulations.
Key Features
- Rooftop and surface runoff collection systems
- First-flush diverter to discard initial contaminated runoff
- Multi-stage filtration: mesh screen, sand filter, activated carbon
- Underground or above-ground storage tanks
- Groundwater recharge: recharge pits, percolation wells, injection wells
- Overflow management and stormwater integration
- UV disinfection for potable use applications
- CGWA and municipal compliance documentation
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Technical Specifications
| Parameter | Specification |
|---|---|
| Collection Area | Rooftop (RCC, tile, metal sheet) / Paved surface |
| First-Flush Volume | 20–25 L per 100 m² of catchment area |
| Filtration | Mesh screen + sand filter + activated carbon filter |
| Storage Capacity | Designed based on catchment area and rainfall data |
| Recharge Structures | Recharge pit / Percolation well / Injection well |
| Water Quality (post-treatment) | BIS IS 10500 (with UV disinfection for potable use) |
| Compliance | CGWA guidelines / BIS IS 15797 / Municipal regulations |
| Monitoring | Flow meter, storage level indicator, water quality sensor |
How It Works
Catchment & Collection
Rainwater falls on the rooftop or paved catchment area and flows through gutters and downpipes to the collection system. The catchment area, slope, and surface material determine the volume and quality of collected rainwater.
First-Flush Diversion
The first 20–25 litres per 100 m² of catchment area (the "first flush") contains the highest concentration of dust, bird droppings, and pollutants. A first-flush diverter automatically discards this initial runoff before directing cleaner rainwater to storage or recharge.
Filtration
Collected rainwater passes through a mesh screen (to remove leaves and debris), a sand filter (to remove suspended solids and turbidity), and an activated carbon filter (to remove colour and organic compounds) before storage or recharge.
Storage
Filtered rainwater is stored in an underground sump or above-ground tank for direct use (flushing, gardening, cooling) or further treatment for potable use. Storage capacity is designed based on the catchment area, rainfall pattern, and demand.
Groundwater Recharge
Excess rainwater beyond storage capacity is directed to groundwater recharge structures — recharge pits, percolation wells, or injection wells — to replenish the local aquifer and raise the water table.
Use & Treatment
Stored rainwater is used directly for non-potable purposes (flushing, gardening, cooling) or treated with UV disinfection and further filtration for potable use, reducing dependence on municipal supply or borewell water.
Capacity Options & Indicative Pricing
Prices are indicative and vary based on raw water quality, automation level, and site conditions. Contact us for an exact quotation.
| Capacity | Typical Application | Indicative Price (INR) |
|---|---|---|
| 200 – 500 m² catchment | Residential building, small office | ₹50,000 – 2 Lakhs |
| 500 – 2,000 m² catchment | Housing society, commercial building | ₹2 – 8 Lakhs |
| 2,000 m²+ catchment | Industrial plant, large campus | ₹8 – 20 Lakhs |
* Prices are ex-works, exclusive of GST, civil work, and installation. Final price depends on site-specific requirements.
Industries & Applications
Why Choose Aquatic Solutions?
Service Coverage Across India
Aquatic Solutions designs and installs rainwater harvesting systems across India — Mumbai, Pune, Thane, Navi Mumbai, Hyderabad, Bangalore, Chennai, Delhi NCR, Ahmedabad, Kolkata, and all major cities. We provide CGWA compliance documentation and MCGM/BBMP/HMDA approval support across Maharashtra, Karnataka, Tamil Nadu, Gujarat, and Telangana.
Frequently Asked Questions
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