Rainwater harvesting is the process of collecting, filtering and storing water from roof tops, paved and unpaved areas for multiple uses. The harvested water can also be used for potable purposes after testing and treatment. The surplus water after usage can be used for recharging ground water aquifer through artificial recharge techniques. This can also result in improving the quality of the ground water e.g. lower fluoride content in ground water. Rainwater harvesting mechanisms are designed after assessing the site conditions such as incident rainfall, subsurface strata and their storage characteristics, infiltration test and by building suitable structures to collect and store rainwater.
Rainwater harvesting system provides a source of soft, high quality water, reduce dependence on wells and other sources, and, in many contexts, are cost effective. Rainwater harvesting system can range in size from a simple PVC tank to a contractor designed and built sump – costing thousand of rupees. Rainwater system are inherently simple in form. Harvesting rainwater is not only water conserving, it is also energy saving since the energy input required to operate a centralized water system can be bypassed.
A range of filters for different filtration rates have also been designed using different filter media.
- To harness good quality water resource now being wasted
- To prevent groundwater depletion
- To augment the expensive piped water supply
- To save expenditure on water
- To prevent soil erosion and urban flooding
- Inexpensive and simple technology
- Aids ecological conservation
Components of Rainwater Harvesting System
- Catchment area
- Conveyance system
- First rain separator
- Filter unit
- Delivery system
- Hydrogeological survey
- Ground water quality analysis and interpretation
- Groundwater level measurement
- Water audit
- Rainfall pattern and distribution analysis
- Strategies for rainwater harvesting including storage/ recharge options
- Catchment management plan
Steps in implementation of rainwater harvesting
Preliminary Feasibility Study
The first step in designing a rain water harvesting scheme is a preliminary feasibility study which involves site visit and collection of relevant data.
- Assessment of site condition
- Rainwater incident on site
- Quantum of harvestable rainwater
- Consumption pattern
- Evaluate existing water supply assets
- Best means to conserve water
Detailed Assessment follow the preliminary study
Detailed assessment involves
- Hydrogeological investigation
- Groundwater quality analysis
- Rainfall pattern analysis
- Catchment management plan
- Design of the rainwater harvesting system
Some work of TIDE in rain water harvesting
- ASIAN NTTF, Electronic City, Bangalore, Karnataka (implementation).
- John Fowler, Bommasandra Industrial area, Bangalore, Karnataka (implementation).
- ITC Infotech, Bangalore, Karnataka (feasibility report).
- G.I.Catalogue clothing company, Bangalore, Karnataka (implementation).
- A.G.Experts, Bangaore (feasibility report)
- A.P.fashion, Bangalore (feasibility report)
- HAL, Bangalore (feasibility report)
- ISRO, Bangalore (feasibility report)
- Suprajit Engineering, Bangalore (feasibility report)
- Cadbury India Limited, Bangalore (feasibility report)
- Tannirbhavi power plant, Mangalore (feasibility report)
- Grindwell Norton, Bangalore (feasibility report)
- Bell Ceramics, Bangalore (feasibility report)
- Senapathy Whiteley, Bangalore (feasibility report)
- Tata Coffee Estate, Madikeri district (feasibility report)
INSTITUTIONS & OTHERS
- Primary schools in Chikmagalur district, Karnataka (implementation)
- Primary School & Anganwadi in Bangalore Urban (implementation)
- St. Marthas Hospital, Bangalore (implementation)
- MVJ Engineering College, Bangalore (implementation)
- Dhondenling settlement, Kollegal taluk, Chamrajanagar (implementation)
- Utopia township, Bangalore (feasibility report)
- Brindavan Estate, Shimoga (feasibility report)
- Indo-Australian farm, Bangalore (feasibility report)
- Karnataka Police Housing Society, Haveri District, Karnataka (feasibility report)
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