Freshwater makes up a very small fraction of all water on the planet. While nearly 70
percent of the world is covered by water, only 2.5 percent of it is fresh. The rest is
saline and ocean-based. Even then, just 1 percent of our freshwater is easily
accessible, with much of it trapped in glaciers and snowfields. In essence, only 0.007
percent of the planet's water is available to fuel and feed its 6.8 billion people
If the world's water supply were only 100 liter our usable water supply of fresh water would be only about 0.003 liter (one-half teaspoon). In actuality, that amounts to an average of 8.4 million liters (2.2 million gallons) for each person on earth. This supply is continually collected, purified, and distributed in the natural hydrologic (water) cycle.
A. Lithology of the area affects the groundwater condition of region.
B. Other Causes for crises of water.
1. Increase In Population.
2. Climatic change.
3. Competition of water resources.
4. Improper agriculture techniques.
5. Increasing Pollution
Rainwater harvesting is a type of harvest in which the raindrops are collected and
stored for future use, rather than allowing them to run off.
Uses of Rainwater
1. Recharge under ground water
2. Gardening , livestock
3. Drinking purpose
4. For irrigation purpose
There are two ways harvesting rainwater.
1. Surface runoff harvesting:
In Urban area rain water flows away as surface runoff. This runoff could be caught and used for recharging aquifers by adopting appropriate method.
2. Roof top Rainwater harvesting
It is a system of catching rainwater where it falls. In roof top harvesting the roof becomes the catchment and the catchment and the rainwater is collected from the roof of the house/building. The method is less expensive and very effective.
1. As Roof Top Rain Water / run off harvesting through
2. Recharge Pit
3. Recharge Trench
4. Tube well
5. Recharge Well