Mathematical modelling of the Gin Ganga watershed

Abstract

Planning and Execution of development activities in watersheds require assessing possible development scenarios and estimating watershed behaviour under such situations. In this connection it is very important to understand the hydrological behaviour of a watershed to satisfy water resources concerns. Mathematical watershed models enable this testing of watershed development scenarios under different changing situations either in the temporal or in the spatial scale. As such this study as its primary objective includes the development of a conceptual mathematical model for the Gin Ganga Watershed (Figure 1). The modeling effort is based on a monthly time resolution. Monthly temporal scale is considered adequate to identify the seasonal response of watersheds in cases of inputs for groundwater models, irrigation reservoir operation planning, irrigation water requirement planning etc. The monthly watershed model developed in this study is a lumped conceptual model using a three-layer linear tank structure based on the Tank Model Concept (Sugawara 1960).