This study focuses on using Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) for the prediction of peak flow condition in Irwin creek watershed in Charlotte, North Carolina. An Arc GIS extension, Geospatial Hydrologic Modeling System (HEC-Geo HMS), is used to generate HEC-HMS model with 13 sub-watersheds. Precipitation data is obtained from United States Geological Survey (USGS) rain gauge stations while National Land Cover Dataset of Natural Resource Conservation Service is utilized for curve number calculation. 6 hours - 100 years storm event produced by National Oceanic and Atmospheric Administration (NOAA) is routed through calibrated model to generate the peak flow from the watershed. Additionally, the impact of climate change on precipitation and resulting peak flow is assessed using climate data developed by North American Regional Climate Change Assessment Program (NARCCAP). Delta change factor of 1.18 is calculated for this study from Hadley Regional Model 3 – Hadley Center Coupled Global Climate Model, a Regional Climate Model – Global Climate Model paired model used by NARCCAP. Through the critical analysis of the peak runoff generated by the calibrated model for NOAA rainfall data and NARCAAP rainfall data, 43% increase in peak flow is determined for 18% increase in storm depth. The study has highlighted the significance of considering impact of climate change that is likely to result in increased peak discharge from the existing urban watersheds.
Narayan Nyaupane– Graduate Student, Southern Illinois University Carbondale, Carbondale, Illinois
Southern Illinois University Carbondale
I am Narayan Nyaupane, a graduate research assistant at Southern Illinois University Carbondale. I have completed my undergraduate from Pulchowk Campus, Tribhuvan University, Nepal on 2007. Since then I was involved as consultant for different small hydropower projects. Before coming to SIUC on 2016 I was working as senior site engineer at Rasuwagadhi Hydropower Project, 111MW. My research area of interest is himalayan hydrology.