Geospatial Analysis of Hydrological Responses and Surface Runoff Patterns in the Saroor Nagar Urban Watershed

Abstract

A useful technique for forecasting a watershed's hydrological response and creating effective management plans for its water resources is hydrological modeling. Because of the rapid urbanization that has occurred since the formation of the Telangana State, the primarygoal of this investigation was to use geospatial techniques to simulate rainfall-runoff processes in the Saroor Nagar urban watershed, Telangana, for the years 2008, 2014, and 2020. The rainfall-runoff process is simulated using the HEC-HMS model. Three distinct techniques have been utilized to simulate the infiltration loss, the transformation of surplus rainfall into surface runoff, and the flow routing of the channel reach: the SCS-Curve Number approach, the SCS unit hydrograph technique, and the Muskingum routing approach. The discharge data from the Hussain Sagar catchment are taken into consideration during the calibration and validation of the proposed model using the regionalization method due to the lack of gauging in the watershed. The model's performance is evaluated by employing the coefficient of determination (R²) as well as the Nash-Sutcliffe Efficiency (NSE). The HEC-HMS model analysis indicates that between 2008 and 2020, the simulated peak discharge increased from 44.4m³/s to 57.1m³/s. During calibration, R² and NSE were 0.88 and 0.75, correspondingly; during validation, they were 0.83 & 0.89. The study's conclusions unequivocally show that the suggested model can faithfully replicate basin stream flow and that it can be used as a guide for wise water resource management in the watershed.