Abstract
Changes in rainfall also affect the runoff of a particular area with sediment yield. The idea of runoff and sediment yield is very essential to conserve water and soil as part of a specific watershed management plan. This paper represents an integrated approach based on remote sensing (RS), geographical information system (GIS), and hydrological modelling to assess the impact of land cover change through runoff modelling and sediment yield. A rainfall-runoff model (SCS-CN) and sediment yield model (MUSLE) evolved to estimate the effect of the land cover change on runoff volume with sediment yield through HEC-HMS v 4.3. Several different land-use scenarios were then simulated with the model, calibrating the impacts of land-use change on the hydrology of the watershed. The baseline test results of R2 and NSE values ranged between 0.61 and 0.88 across the calibration and validation periods, indicating that HEC-HMS accurately replicated the alluvial streamflow. The hypothetical scenario simulations revealed that sediment yield increased with runoff volume, and most of the concentration happens in the non-monsoonal period with declining runoff and rapid urbanization.
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