Simulating streamflow in the Upper Halda Basin of southeastern Bangladesh using SWAT model

Farzana Raihan, Linda J. Beaumont, Joseph Maina, Akm Saiful Islam, Sandy P. Harrison

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Most catchments in tropical regions are ungauged and data deficient, complicating the simulation of water quantity and quality. Yet, developing and testing hydrological models in data-poor regions is vital to support water management. Here, we used the Soil and Water Assessment Tool (SWAT) to predict stream runoff in Halda Basin in Bangladesh. While the calibrated model’s performance was satisfactory (R 2 = 0.80, NSE = 0.71), the model was unable to track the extreme low flow peaks due to the temporal and spatial variability of rainfall which may not be fully captured by using data from one rainfall gauging station. Groundwater delay time, baseflow alpha factor and curve number were the most sensitive parameters influencing model performance. This study improves understanding of the key processes of a catchment in a data-poor, monsoon driven, small river basin and could serve as a baseline for scenario modelling for future water management and policy framework.

Original languageEnglish
Pages (from-to)138-151
Number of pages14
JournalHydrological Sciences Journal
Volume65
Issue number1
Early online date11 Nov 2019
DOIs
Publication statusPublished - 2 Jan 2020

Keywords

  • Bangladesh
  • Halda Basin
  • SWAT
  • hydrology
  • sensitivity analysis
  • streamflow

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