The ministry is, however, exploring ways to ensure these reservoirs do not interrupt free flowing of the river water.
The new initiative is likely to be carried out by the Central Water Commission involving public participation, senior Water Resources Ministry officials said.
"Several reservoirs can be built across Ganga to store rainwater during the monsoon. The stored water can then be used when the river dries up," the sources said, citing similar rivers which dry up during the summer.
Though the concept is conceived for Ganga, it may be gradually expanded for other rivers in the country, which shrinks in the summer.
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Projected as the first project to be taken up under NDA government's ambitious plan to interlink rivers of the country, the project envisages diversion of surplus water from the Ken basin to the water-deficit Betwa basin.
It is estimated that the project would provide annual irrigation for 6.35 lakh hectares and supply drinking water to 13.42 lakh people. It would also facilitate generation of 78MW hydropower in Madhya Pradesh and Uttar Pradesh.