Techniques of Rain Water Harvesting to Increase Ground Water Levels

1636 Words Sep 26th, 2010 7 Pages
RAIN WATER HARVESTING AND ARTIFICIAL RECHARGE OF GROUND WATER RAJASTHAN CONTEXT by Dr. S. K. GUPTA
Scientist ‘D’ Central Ground Water Board Western Region, Jaipur

Rain water harvesting and Artificial recharge of ground water
Rainwater harvesting is the technique of collection

and storage of rain water at surface or in subsurface aquifer, before it is lost as surface run off or as

evaporation.
The artificial recharge to ground water is a process by which the ground water reservoir is augmented at a rate exceeding that under natural conditions of replenishment utilizing suitable civil construction techniques.

Identification of Area
•Areas where availability of ground water is inadequate in lean months. •Areas where groundwater levels
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Check Dam, Cement Plug, Nala Bund
A series of small bunds are made across selected nala sections such that the flow of surface water in the stream channel is impeded and water is retained on pervious soil/rock surface for longer period. Nala bunds are constructed across bigger nalas of second order streams in areas having gentler slopes. A nala bund acts like a mini percolation tank.
Horizontal Section of Nala Bund

Vertical Section of Nala Bund

Site Characteristic and Design Guidelines
• The total catchment of the nala should normally be between 40 to 100 Hectares. The rainfall in the catchment should be 25 m). • Aquifer is over lain by impervious thick clay beds. • Injection well can be with or without assembly. • The Injection well with assembly should have screen in the potential aquifer at least 3-5 m below the water level. • The injection well without assembly is filled with gravel to provide hydraulic continuity so that water is directly recharged into the aquifer.

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The injection well without assembly is very costeffective. The efficiency is very high and rate of recharge goes even up to 15 1ps at certain places. Vertical Shaft with Injection Well

Rainwater Harvesting Structure, Collectorate Building, Jaipur

Lateral Recharge Shaft


Ideally suited for areas where permeable sandy horizon is within 3 meter

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