A Study on Estimation of Rainfall-Runoff Simulation Accuracy for Rihand Catchment with Remote Sensing Data Using Physically based Semi-Distributed HEC-HMS Model

Kamuju Narasayya

Abstract: Hydrologic modelling serves as a frequently employed tool for comprehending the processes of rainfall runoff in both monitored and unmonitored catchment areas, facilitating accurate quantitative assessment of water resource availability. In the present study, an attempt has been made to simulate surface runoff using physically based semi-distributed hydrological model for large scale catchment of Rihand River, called Rihand catchment, situated in Chhattisgarh state of India. The input physical parameters of the model were calculated and pre-processed based on Digital Elevation Model (DEM). The special focus in this study was utilization of Global Curve Number Grid data for computation of Curve Number of each subbasin of the catchment. This GCN250m grid data downloaded from Google Earth Engine, which saved the time consumption and data processing of Landuse and soil maps for computation of Curve Number for each subbasin. The loss method of Soil Conservation Service Curve Number (SCS-CN), and transform method of Soil Conservation Service Unit Hydrograph (SCS-UH), and Muskingum routing methods are adopted for simulation. Hydro-Meteorological data collected from 3 rain gauge stations from IMD-Pune. In and around Rihand catchment. The model performance was satisfactory with Nash Sutcliffe Efficiency (NSE) 0.512 to 0.706 and the coefficient of determination (R2) 0.637 to 0.709, also PBIAS varies from 11.6 to 44.8 during calibration (2016-2017) and validation (2018). The established methodology is deemed applicable in unmonitored catchments, aiding water resources management and planning endeavors within projected future climate scenarios. This approach assists hydrologists in comprehending the effectiveness and utility of the HEC-HMS model for rainfall-runoff simulation modeling.

Keywords: Hydrologic Engineering Center, Flow Hydrograph, Rainfall-Runoff, Curve Number, SCS-Unit Hydrograph