University of Khartoum

Rainfall–RunoffModeling and Suitability Analysis for Water Harvesting Projects in Wadi Nyala

Rainfall–RunoffModeling and Suitability Analysis for Water Harvesting Projects in Wadi Nyala

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Title: Rainfall–RunoffModeling and Suitability Analysis for Water Harvesting Projects in Wadi Nyala
Author: Ali,Ahmed Abdallah Dafaallah
Abstract: The rainwater harvesting is very important to decrease the pressure on water resources with increasing of population. The main objective of this research is the development of rainfall – runoff model for Wadi Nyala and conduct water harvesting suitability analysis to locate suitable harvesting projects. The data used in this study are daily data of observed rainfall (mm) at meteorological station of Nyala and observed discharge in (cubic meter per second) at Nyala hydrometric station. Spatial data for soils, land use/land cover and DEM were obtained as publically archived data from NOAA and FAO. Preliminary analysis is done to find the relationship between the observed rainfall and runoff and hence the runoff coefficient. The Hydrologic Engineering Center - Hydrologic Modeling System (HEC-HMS) is used as the main hydrologic model. GeoHMS under GIS environment is used to create input files for hydrologic modeling. The public domain data is used for suitability analysis to select suitable water harvesting site. Both the initial and constant rate and soil moisture accounting methods for losses were used and a lumped configuration of the study area is considered. The model is calibrated in one year data and verified on the other year. The calibration is done manually and due to the lack of data there is no suitable match between observed and simulated discharges found. Suitability analysis was conducted to locate suitable areas for water harvesting in the study area. It can be concluded that the study area is divided into five sectors based on its suitability for water harvesting, namely, not suitable, very low suitability, low suitability, medium suitability and high suitability.
Description: 78 Pages
URI: http://khartoumspace.uofk.edu/123456789/22032


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