Spatial Modeling of Urban Hydrology of Samarra City Using Snyder Model
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Abstract
This research aims to study the urban hydrological behavior of Samarra city using spatial modeling techniques. The Snyder Unit Hydrograph Model (SUHM) is a classic analytical model used to analyze surface water runoff within watersheds.
The research included the use of Geographic Information Systems (GIS) and remote sensing to extract morphometric characteristics of the Samarra city drainage basin, such as basin area, main drainage length, and slope, to support the Snyder model's requirements for generating the unit hydrograph.
Rainfall and topographic data, along with land use data, were collected to determine the extent to which urban expansion affects surface runoff patterns and increases flood risk. The model was used to generate surface runoff hydrographs resulting from hypothetical rainstorms with different return times.
The results showed that urbanization and the increase in impermeable areas contributed to a reduction in concentration time and an increase in peak runoff volume, increasing the likelihood of flooding. The Snyder model has also proven its effectiveness in simulating surface runoff when the underlying data are accurate, making it an effective tool for hydrological planning and flood risk management in urban areas.
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