These earthen check dams improve percolation and recharge the water table. write the meaning of percolation in this statement
Answers
Answer:
Of the total water on earth, only 3% constitutes freshwater. Rest is saline water in the oceans.
11% of the total freshwater on earth is groundwater available upto a depth of 800m which can be extracted for use.
Mindless extraction and over exploitation of very small quantity of this precious nature resource has caused a rapid depletion and deterioration in its quantity and quality both.
Distribution of fresh water on earth
Distribution of fresh water on earth
Methods and techniques for ground water recharge
Urban Areas
Rural Areas
Roof Top Rain Water / run off harvesting through
Recharge Pit
Recharge Trench
Tubewell
Recharge Well
Rain Water Harvesting through
Gully Plug
Contour Bund
Gabion Structure
Percolation tank
Check Dam/ Cement Plug/ Nala Bund
Recharge shaft
Dugwell Recharge
Ground Water Dams/Subsurface Dyke
Ground water recharge in Rural areas
In rural areas, rain water harvesting is taken up considering watershed as a unit. Surface spreading techniques are common since space for such systems is available in plenty and quantity of recharged water is also large. Following techniques may be adopted to save water going waste through slopes, rivers, rivulets and nalas.
Gully plug
Gully plugs are built using local stones, clay and bushes across small gullies and streams running down the hill slopes carrying drainage to tiny catchments during rainy season.
Gully Plugs help in conservation of soil and moisture.
The sites for gully plugs may be chosen whenever there is a local break in slope to permit accumulation of adequate water behind the bunds.
Contour bund
contour bund
Answer:
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