Palakkad district has the highest aquifer system in KeralaCentral Ground Water Board has compiled an aquifer atlas of Kerala which shows over exploitation of ground water in the State. (Aquifer is any geological formation containing water). It estimated the net annual ground water availability in the State at 6.01 billion cubic meters as on March 2011.
The distribution of aquifer systems is uneven within the State, with the highest coverage, 4,480 sq. km. coming in Palakkad district followed by Idukki with 4,358 sq. km. the lowest coverage is in Alappuzha, 1,414 sq. km.
This aquifer map will help scientific management of groundwater management of ground water resources of the State. This become important in the light of human activities which over-exploit the ground water and lead to environmental issues.