HYDROLOGICAL MODELING OF SURFACE RUNOFF OF WATER BASINS IN THE DRY VALLEYS EAST OF LAKE THARTHAR

The research aims to model the hydrological runoff of the water basins in the dry valleys east of Lake Tharthar. According to the (CN-SCS) ) equation , which was based on several variables that were used, namely (remote sensing data, climate data, hydrological soil data) , in order to provide a clear picture of the hydrological nature of the region. In addition, the application of remote sensing data and the GIS environment in identifying locations. The results showed that most of the ( CN) values exceed (55), ranging between (30-71). These high values indicate that the soil permeability is low, which was represented by a value of (71) and an area of (7.50) km2, which contributes to the formation of high surface runoff that allows water to carry out erosion processes widely within the basin lands . As for the low values, they indicate high soil permeability, which reached a value of (30) and an area of (100.90) km2 of the total general area in the study area. Development plans were developed to benefit from the natural capabilities that the study area possesses. The study proposes the establishment of hydrological stations to measure the amount of water flow, especially in areas with water catchments, to benefit from it instead of wasting it.