Groundwater recharge from water storage structures under semi-arid conditions of
western India has been estimated by employing water table fluctuation (WTF) and chloride
mass balance (CMB) methods. Groundwater recharge was estimated as 7.3% and 9.7% of the
annual rainfall by WTF method for the years 2003 and 2004, respectively while the two years
average recharge was estimated as 7.5% using CMB method. A Recharge function depicting
the relationship between potential recharge from storage structures and successive day averaged
storage depths was better exhibited by a power function. A diagnostic relationship correlating
the rainfall to the potential recharge from water storage structures has been developed
to explain the characteristics of the storage structures for a given geographical location. The
study has revealed that a minimum of 104.3 mm cumulative rainfall is required to generate
1 mm of recharge from the water storage structures. It was also inferred that the storage structures
have limited capacity to induce maximum recharge irrespective of the amount of rainfall
and maximum recharge to rainfall ratio is achieved at a lower rainfall than the average annual
rainfall of the area. An empirical linear relationship was found to reasonably correlate the
changes in chloride concentration with water table rise or fall in the study area.
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