Open AccessRainfall-runoff simulation of Bagmati River Basin, Nepal
Author(s) -
Yam Prasad Dhital,
Binod Dawadi,
Dambaru Ballab Kattel,
Krishna Chandra Devkota
Publication year - 2021
Publication title -
jalavāyu
Language(s) - English
Resource type - Journals
ISSN - 2773-8205
DOI - 10.3126/jalawaayu.v1i1.36450
Subject(s) - hydrograph , surface runoff , hydrology (agriculture) , environmental science , context (archaeology) , correlation coefficient , runoff model , runoff curve number , flooding (psychology) , structural basin , geology , statistics , mathematics , geotechnical engineering , psychology , ecology , paleontology , psychotherapist , biology
Runoff simulation is a complex problem in mountain catchments due to high rainfall variability and rugged topography. In the lower parts of Nepal, river flooding is a serious disaster problem in July and August; sometimes it also occurs in September. In this context, Hydro-Informatic Modeling System (HIMS) was used for daily and monthly runoff simulation from the set of daily hydro-meteorological data (Maximum and minimum temperature, rainfall, and discharge) in the time series 1980 to 1989, 1990 to 1999, and 2000 to 2009, respectively. The model performed well for the monthly runoff simulation, whereas the efficiency coefficient and relative coefficient both were found a very good correlation between observed and simulated hydrographs, which varied between 0.883 to 0.940 and 0.889 to 0.945, respectively. However, the efficiency coefficient and relative coefficient both were found a very poor correlation between observed and simulated hydrographs for the daily runoff simulation, which averaged 0.342 and 0.348, respectively. The daily simulation result also might have been improved, if more number of uniformly distributed meteorological station data is available.