Modelling of Irrigation Return Flow in Unconfined Aquifer of Dharoi Command in Mehsana District of Gujarat, India

Surface water flow and subsurface have traditionally been investigated separately simulators developed over the years, to model each of these systems. Growing interest in conjunctive management, need for simulations surface/subsurface their interactions has lead linking models respective domains. This study from Dharoi command area, using MODFLOW, showed pertaining second layer calibrated model. The first is a thin soil cover about 3 m uniform thickness. Top kept under unconfined table condition, where as next given scope transforming between confined state vice versa depending upon fluctuation computed level with respect bottom boundary top layer. No recharge discharge options other than single condition average May extreme north-east grid allowed. calibration based matching observed gradient (hydraulic gradient) nothing do point values observation wells that could misappropriation hydrologic condition. Over all area 0.23 per km comparison an hydraulic 0.3 km. rivers such Sabarmati downstream dam up Bijapur, Rupen Pushpawati are activated transient run. Conductance value considered 0.0001 m/sec rivers. proximity state. Comparisons levels selected locations. Overall match trends indicate run can be base case various studied this Visual MODFLOW very effective know present scenario ground flow, aquifer, wells, also distribution spatial recharge, specific yield distribution. It gives close result value.