A subsurface dike is built in an aquifer to obstruct the natural flow
of groundwater, thereby raising the groundwater level and increasing
the amount of water stored in the aquifer. The subsurface dike at Krishi Vigyan Kendra Kannur under Kerala Agricultural University
with the support of ICAR, has become an effective method for ground
water conservation by means of rain water harvesting technologies. The
subsurface dike has been demonstrated to be a feasible method for
conserving and exploiting the groundwater resources of the Kerala state of India. The dike is now the largest rainwater harvesting system in that region.
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