Modelling and Simulation of Rainfall-Runoff Relations for Sustainable Water Resources Management in Ethiope Watershed using SCS-CN, ARC-GIS, ARC-HYDRO, HEC-GEOHMS and HEC-HMS
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 2, Issue 3
Abstract
Rainfall-runoff modelling is an integral part of water resources planning and management. Runoff is one of the most important hydrologic variables used in most of the water resources applications and accurate information on the quantity and rate of runoff from land surface into streams and rivers is vital for integrated water resource management since information on runoff is required to deal with many watershed development and management problems. The aim of the research was to develop a conceptual rainfall-runoff model using River Ethiope as a case study. The input data for the model were annual rainfall data, annual temperature data, daily rainfall data and the digital elevation model (DEM) of the study area. The annual rainfall and temperature data were first analyzed for outliers, homogeneity and normality before used while the HEC-HMS model was calibrated using one month daily rainfall data. The runoff simulation was done by integrating ARC-HYDRO, HEC-GEOHMS, HEC-HMS and ARCGIS.To develop the runoff model and compute the daily runoff, information on the watershed characteristics were first determined. The initial base flow was assumed to be 0.00, Soil conservation systems (SCS) curve number (CN) for direct runoff value was determined from existing standard tables based on the catchment characteristics, initial abstraction was assumed to be 0.00, Muskingum K (Hr), was calculated using the routing equation, Muskingum X lies between 0.1 to 0.3 for reach while impervious surface (%) was taking as 0.00.
Authors and Affiliations
Ihimekpen NI, Ilaboya IR, Onyeacholem OF
Keywords
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- EP ID EP606815
- DOI 10.32474/TCEIA.2018.02.000136
- Views 43
- Downloads 0
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