Rain water belong to each one of us................
But how do we keep and share is more important........
Have you got your share?
Water on the earth is the main source of survival. It is the most abundant and the most rare on this earth. The fresh water is the asset that we are going to pass on to the next generation. The rampant expansion of the civilization has resulted in the decline of this precious asset. The water table has been declining consistently. Rain water harvesting is one of the most important tool in preserving the water table. With the population explosion the increased demand for the
Why harvest rainwater?
The rain water has become the ultimate source of water. Still you might like to know the reasons for harvesting.
• Relief of strain on other water supply
• Ability to build or farm in areas with no other water supply
• Cleaner water
• Increased independence and water security
• Lower water supply cost
• Reduced flood flows
• Reduced topsoil loss
• Improved plant growth
• Greater sensitivity to and connection with natural cycles
There is greater improvement in infiltration and reduction in run-off. Having the constant supply of water also helps in reducing strain on Special Village Panchayats/ Municipal / Municipal Corporation water supply
Improvement in groundwater quality is also the result of the rain water harvesting.
Estimated quantity of additional recharge from 100 sq. m. roof top area is 55.000 liters.
The various methods for the Rain Water Harvesting
Pits
Recharge pits are constructed for recharging the shallow aquifer. These are constructed 1 to 2 m, wide and to 3 m. deep which are back filled with boulders, gravels, coarse sand.
Trenches
These are constructed when the permeable stream is available at shallow depth. Trench may be 0.5 to 1 m. wide, 1 to 1.5m. deep and 10 to 20 m. long depending up availability of water. These are back filled with filter. materials.
Dug wells
Existing dug wells may be utilized as recharge structure and water should pass through filter media before putting into dug well.
Hand pumps
The existing hand pumps may be used for recharging the shallow/deep aquifers, if the availability of water is limited. Water should pass through filter media before diverting it into hand pumps.
Recharge wells
Recharge wells of 100 to 300 mm. diameter are generally constructed for recharging the deeper aquifers and water is passed through filter media to avoid choking of recharge wells.
Recharge Shafts
For recharging the shallow aquifer which are located below clayey surface, recharge shafts of 0.5 to 3 m. diameter and 10 to 15 m. deep are constructed and back filled with boulders, gravels & coarse sand.
Lateral shafts with bore wells
For recharging the upper as well as deeper aquifers lateral shafts of 1.5 to 2 m. wide & 10 to 30 m. long depending upon availability of water with one or two bore wells are constructed. The lateral shafts is back filled with boulders, gravels & coarse sand.
Spreading techniques
When permeable strata starts from top then this technique is used. Spread the water in streams/Nalas by making check dams, nala bunds, cement plugs, gabion structures or a percolation pond may be constructed.
This inspiring video is a must watch
http://www.youtube.com/watch?v=wWnhYIIKY0U
But how do we keep and share is more important........
Have you got your share?
Water on the earth is the main source of survival. It is the most abundant and the most rare on this earth. The fresh water is the asset that we are going to pass on to the next generation. The rampant expansion of the civilization has resulted in the decline of this precious asset. The water table has been declining consistently. Rain water harvesting is one of the most important tool in preserving the water table. With the population explosion the increased demand for the
Why harvest rainwater?
The rain water has become the ultimate source of water. Still you might like to know the reasons for harvesting.
• Relief of strain on other water supply
• Ability to build or farm in areas with no other water supply
• Cleaner water
• Increased independence and water security
• Lower water supply cost
• Reduced flood flows
• Reduced topsoil loss
• Improved plant growth
• Greater sensitivity to and connection with natural cycles
There is greater improvement in infiltration and reduction in run-off. Having the constant supply of water also helps in reducing strain on Special Village Panchayats/ Municipal / Municipal Corporation water supply
Improvement in groundwater quality is also the result of the rain water harvesting.
Estimated quantity of additional recharge from 100 sq. m. roof top area is 55.000 liters.
The various methods for the Rain Water Harvesting
Pits
Recharge pits are constructed for recharging the shallow aquifer. These are constructed 1 to 2 m, wide and to 3 m. deep which are back filled with boulders, gravels, coarse sand.
Trenches
These are constructed when the permeable stream is available at shallow depth. Trench may be 0.5 to 1 m. wide, 1 to 1.5m. deep and 10 to 20 m. long depending up availability of water. These are back filled with filter. materials.
Dug wells
Existing dug wells may be utilized as recharge structure and water should pass through filter media before putting into dug well.
Hand pumps
The existing hand pumps may be used for recharging the shallow/deep aquifers, if the availability of water is limited. Water should pass through filter media before diverting it into hand pumps.
Recharge wells
Recharge wells of 100 to 300 mm. diameter are generally constructed for recharging the deeper aquifers and water is passed through filter media to avoid choking of recharge wells.
Recharge Shafts
For recharging the shallow aquifer which are located below clayey surface, recharge shafts of 0.5 to 3 m. diameter and 10 to 15 m. deep are constructed and back filled with boulders, gravels & coarse sand.
Lateral shafts with bore wells
For recharging the upper as well as deeper aquifers lateral shafts of 1.5 to 2 m. wide & 10 to 30 m. long depending upon availability of water with one or two bore wells are constructed. The lateral shafts is back filled with boulders, gravels & coarse sand.
Spreading techniques
When permeable strata starts from top then this technique is used. Spread the water in streams/Nalas by making check dams, nala bunds, cement plugs, gabion structures or a percolation pond may be constructed.
This inspiring video is a must watch
http://www.youtube.com/watch?v=wWnhYIIKY0U
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