Author(s): M. N. Viswanathan
Linked Author(s):
Keywords: No Keywords
Abstract: The maximum quantity of water that can be extracted from an aquifer usually de pends upon the recharge levels of the aquifer. In the case of unconfined aquifers, recharged b y rainfall, a fraction of the rainfall reaches the water table and the rest is lost either as evapotranspiration or as runoff. This fraction depends upon sev eral factors like surface level grad ients, soil moisture levels、depth of water tab le, intensity of rain fall etc. In the present analysis, the recharge rates due to rainfall are estimated using time series analysis. A model is developed that relates rain fall and w ater table levels. From the model, the recharge coefficients are estimated as a function of time. T he model parameters are estimated using a method known as Recursive Instrumental Variab le Method. From the recharge coefficients estimated, it was observed that (i) the recharge coefficients are highly time depen dent (ii) the recharge levels depend upon the intensity of rainfall and (iii) the maximum rec harge need not take place on the day of rainfall.
Year: 1985