Author(s):

A Valliammai

Abstract: The hydrological parameters on water resources are of utmost importance for ensuring their appropriate management and utilization. The study was carried out to investigate the impact of climate change on watershed hydrology of Amaravathi river basin using SWAT model. The hydrological parameters viz., Precipitation, Soil moisture content, Surface Runoff, Evapo-Transpiration, and Groundwater Recharge was estimated spatially and temporally by water balance method using SWAT model. The Amaravathi river basin was divided into 15 sub basins based on the DEM and stream network. The monthly and annual hydrological parameters were simulated by SWAT for the period 1990 to 2017. The annual mean of soil moisture content was found to be 92.11 mm. The minimum and maximum soil water content was 65.00 mm and 110.73 mm occurred in 2013 and 1993. The maximum runoff of 703.24 mm occurred in the year 2013 and minimum runoff of 52.18 mm occurred in the year 1995. The average annual actual evapotranspiration varied between 477.81 mm (2008) to 303.78 mm (1995). The maximum and minimum groundwater recharge of 351.89 mm and 2.15 mm occurred in 2013 and 1995 with an average groundwater recharge of 105.43 mm.. The decrease in recharge manifested itself as reduced discharge to streams and hence reduced stream flow. Hence the atmospheric moisture demand of the basin indicating the need of water from external / underground sources for successful crop production.

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