NDCWWC Journal
Year : 2023, Volume : 12, Issue : 1
First page : ( 3) Last page : ( 9)
Print ISSN : 2278-8395. Online ISSN : 2278-8409.

SWAT as a Tool for Water Management at River Basin Level - A Case Study on Tungabhadra Basin

Usha K.¹

¹Water Resources Department, Karnataka Engineering Research Station, Mandya District, Karnataka

Online Published on 01 November, 2023.

Abstract

Hydrological models like SWAT is a river basin or watershed model which are used to predict the impact of land management practices on water, sediment and agricultural chemical yields in large, complex watershed with varying soil, landuse and management conditions over long period of time. This is a physical based model which uses available inputs and is computationally efficient. Tungabhadra basin in Karnataka was selected for the hydrological modeling of the basin using SWAT model. The Arc swat tool was used to generate the sub watersheds from the carto-dem. Ten sub basin outlets were chosen which corresponds to the gauging sites of CWC and reservoir locations with in the basin. HRU analysis was carried out, wherein, the land use land cover, soil and slope map were given as the inputs and HRU analysis report were generated. The weather parameters such as precipitation, temperature, solar radiation, relative humidity and wind velocity were given as inputs to the model. After successful updation of swat input files the model was run for 20 years i.e., from 1995-2014 and first five years data was used as warming period and the output files were generated for the year 2000 onwards. SWAT model was used to assess the discharge in the basin at the specified outlets which are also the gauging sites maintained by CWC. The ouput discharge obtained from model was then compared with the observed discharge. The sediment yield in the basin was also obtained from the model.

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Keywords

Computationally efficient, Complex watershed, Discharge, HRU, Sediment yield.

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