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. Rain is the primary sources of water. However, when it rains, either some of the water evaporates or run-offs and goes unused into the ocean or stands for days in drains and sewer lines to later flow away as sewage water.
Components of Rainwater Harvesting System
Catchment area For flat Conveyance system For flat First rain separator For flat Filter unit For flat Storage For flat Delivery system For flat Usage For flat Recharge
Benefits
To harness good quality water resource now being wasted 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 To prevent groundwater depletion
Catchment area
For flat Conveyance system
For flat First rain separator
For flat Filter unit
For flat Storage
For flat Delivery system
For flat Usage
For flat Recharge
To harness good quality water resource now being wasted
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
To prevent groundwater depletion 
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