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Rainfall-Runoff Modeling and Curve Number for Sohar Basin using GIS and Remote Sensing

Authors: Ghazi Al-Rawas*, Sultan Qaboos University, Luminda Gunawardhana, Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, Oman, Malik Al-Wardy, Department of Soils, Water and Agricultural Engineering, College of Agricultural and Marine Sciences, Sultan Qaboos University, Oman, Yassine Charaabi, Department of Geography, College of Arts and Social Sciences, Sultan Qaboos University, Oman
Topics: Arid Regions, Water Resources and Hydrology, Middle East
Keywords: Remote Sensing, GIS, Curve Number, rainfall and Sohar basin
Session Type: Paper
Presentation File: No File Uploaded

The characteristic of a watershed that affects the runoff is soil type and land use and land cover type and mean precipitation. In dry tropical regions, superficial features that strongly affect the hydraulic properties of surface horizons mostly control the soil infiltration capacity and consequently, runoff and soil water erosion. It is difficult to calculate runoff from arid areas due to various reasons, in arid region; generally, wadis will flow after storms and rapidly infiltrate into ground. This study is attempted to measure rainfall runoff and curve number using ArcCN-Runoff tool. This knowledge may aid to better management of rainwater and may help to identify the suitable location to construct recharge dams. The methodology used in this studay is based on Soil Conservation Service (SCS) rainfall-runoff model, This study indicated that remote sensing and GIS tools can be used effectively to calculate the curve number and runoff of the basin, specifically in arid regions, where it is difficult to estimate accurately for various reasons, mainly high variability, lack of data, inconsistency of data, and inefficient network geographic distribution of rain and runoff gauge stations.

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