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Assessment of Water Balance Components in the Selected Part of the Surma River Basin using SWAT Model and GIS

Corresponding Author : Mahpara Jahan Mahi (mahparamahi.sec@gmail.com)

Authors : Mahpara Jahan Mahi (mahparamahi.sec@gmail.com), Anupama Roy (anupamaroysyl99@gmail.com), Md. Jahir Bin Alam (jahiralam@yahoo.com)

Keywords : Water Balance Components, The Soil and Water Assessment Tool (SWAT), Geographical Information System (GIS), Digital Elevation Model (DEM), Land Use and Land Cover (LULC)

Abstract :

This study mainly focuses on the quantification of various components of water balance of the Surma basin in Sylhet City using Geographic Information Systems (GIS) and The Soil and Water Assessment Tool (SWAT) model. This study has been carried out to understand the relationship among the basin’s water balance elements, the water accessibility, and watershed features of the Surma river basin, which is essential for sustainable water resource management and planning of Sylhet city. ArcGIS software is used to process and visualize various types of input data, especially the Digital Elevation Model (DEM), Land Use and Land Cover (LULC), climate, and soil properties of the selected portion of the Surma basin. These processed inputs are utilized by the SWAT model for estimating various balancing components including rainfall (5990.1mm & 5990.1mm), surface runoff (5176.86mm & 5164.36mm), evapotranspiration (ET) (690mm &717.8mm), and groundwater recharge (92.59 mm & 78.79 mm) as simulated outputs for the two user-defined experimental watersheds (W1 and W2) chosen inside the study domain in delineation process for successful simulation. Subsequently, regression analysis is performed by comparing the simulated data with actual data to validate the simulated results and performance of the SWAT model in the research area. The coefficient of determination i.e., R2 between the simulated data and observed data is found satisfactory (R2> 0.85) for each watershed, which validated the results.

Published on October 23rd, 2024 in Volume 4 Issue 2, Civil Engineering, Environment and Architecture