CHARACTERISTICS OF HYDROLOGICAL MODELLING OF MAHANADI BASIN USING THE HEC-HMS SOFTWARE

Abstract

Hydrological Modeling consists of different mathematical models which represents as well as conclude various hydrological processes and its components to alter the interaction between them. To simulate the rainfall – runoff processes a watershed model HEC-HMS has been used in hydrological processes caused due to precipitation. It helps in predicts different hydrological parameters with respect to the watershed management and its adverse effect along its area. A model for rainfall runoff process is taken across The Mahanadi Basin. Two different catchments were selected Seonath Catchment and Jonk Catchment for the study. Simulations were conducted daily, monthly and yearly time scale resolutions. In this study, two methods were used as a loss models for major components i.e SCS-CN Method and SMA Method. Both the methods have different parameters and to obtain the exact results for both the catchment , they are used on both the catchments to differentiate. Results of both the catchments were different as Simulated runoff and observed runoff of Jonk Catchment somehow follows the exact pattern at various time intervals but for Seonath catchment the simulated runoff and observed runoff were different. The software cannot process the exact rainfall-runoff simulation in Seonath and Jonk catchment present in the Mahanadi Basin obtained by SMA method as it is very complex method for simulation but shows exact results obtained by SCS-CN method along both catchments at various time intervals. The results of present study for the Mahanadi Basin found to be useful for obtaining various objectives as discussed further and also both the methods have been differentiated along with the simulation results for proper rainfall runoff processes.