Abstract
The analysis of the watershed gives the surface area of land that rain streamed arrived in the river. The modern method to analyze the catchment is the ArcGIS program based on the Digital Elevation Model (DEM). The study area is An Najaf province, which area equaled about 27675 square kilometers. The HECGeoHMS (Hydrologic Engineering Center's Hydrologic Modeling System) is the link program on the ArcMap software that abled by serious steps to analyze the specific watershed. The auto analysis of the watershed area gives four basins for each outlet points located on the distributary Euphrates river. These four basins consisted of multi sub-basins and streams of rain flow. Basin 4 has the most significant volume, about 11.4% of the total case area of the basin, and the average slope is 3.2%. According to the amount of accumulative rainwater, basin 4 is essential when any obstruction is constructed at the end of the outlet point in the stream. This location of the construct is used to prevent the sediment in the Euphrates river and to avoid surface soil degradation. The arrangement of importance basin based on the advantage of water using to give maximum discharge and low evaporation is basin four at the first, basin two at the second.
Highlights
The watershed analysis model is the first step to study the hydrologic cycles and the possibility of water management
According to the amount of accumulative rainwater, basin 4 is essential when any obstruction is constructed at the end of the outlet point in the stream. This location of the construct is used to prevent the sediment in the Euphrates river and to avoid surface soil degradation
The arrangement of importance basin based on the advantage of water using to give maximum discharge and low evaporation is basin four at the first, basin two at the second
Summary
The watershed analysis model is the first step to study the hydrologic cycles and the possibility of water management. Digital Elevation Model (DEM) is the best-computerized data to analyze the watershed of a specific region (Douglas 1986). The information of DEM was increased based on the digital topography, especially over the last two decades (Jenson et al 1988, Mark 1984, Moore et al 1991 and Martz et al 1992). Geographic Information System (GIS) is readily imported and analyzed the digital data of DEMs.The technological of GIS and digital data of DEM was used the application of hydrologic, water resources, and environmental investigations (Moore et al 1991)
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