Simulation of Water Balance Components Using SWAT Model at Sub Catchment Level

Simulation of Water Balance Components (WBCs) is import for sustainable water resources development and management. The Soil Assessment Tool (SWAT) a semi-distributed hydrological model to estimate the WBCs by forcing response unit (HRU) meteorological variables. developed simulates five viz. surface runoff, lateral flow, percolation, actual evapotranspiration soil at sub catchment level. To demonstrate compatibility case study taken over Chittar catchment, Tamilnadu, India. was divided in 11 catchments. ten year interval LULC (i.e., 2001 2011), twenty daily data 2001–2020) time invariant slope were used developing balance model. Developed calibrated evaluated with river gauge monthly discharging using SUFI-2 algorithm SWAT-CUP. calibration performed two stage i.e., pre-calibration (2001–2003) post-calibration (2004–2010). performance unseen 2011–2015). Then, results statistical outputs coefficient determination (R2) 0.75 pre-calibration, 0.94 0.81 validation. Further strengthen confidential level catchments compared gridded global GLEAM v3.6a. Finally, simulate whereas, during 2001–2020. trend helps make fast accurate decision. At all long drought observed 2016–2018 due failure northeast monsoon. directly reinforced their north east monsoon which gives major portion rainfall September December. Hence correlated or without lag. By understanding useful land resource