Impact of land use change on groundwater flow using SWAT model, study case: Tanralili Sub Watershed

Abstract

Land-use changes impact the condition of the watershed ecosystem primarily in supporting the availability of water resources, which is currently a problem in meeting human needs. This study aims to identify the impact of land-use change on the bottom flow in the Tanralili sub-watershed. In SWAT model procedure are divided into several stages, namely: (1) watershed delineation; (2) forming HRU (3) Hydrology Response Unit (HRU) analysis; (4) climate data input; (5) building climate data; (6) run model; (7) calibration and validation and (8). simulation of hydrological parameters to determine the best land management. The result shows that the model has a good performance in predicting discharge flow with the NSE value in the calibration process of 0.23 (acceptable). In predicting the flow of discharge in the validation process, the NSE value is 0.62. The SWAT model can predict the impact of land-use changes on hydrological characteristics, especially the basal flow in the Tanralili sub-watershed. Analysis of the Tanralili Sub-watershed's hydrological characteristics, the SWAT results in 2010, 2015, and 2020 can be shown by the baseline flow of 494.64 mm 247.26 mm 256.48 mm, respectively.