Hydrological analysis and modeling of surface runoff of water basins in the area (Shirqat District - Saladin Governorate) A comparative study between the (CN-SCS) and (Snyder) methods

The area (1558,3) km2 in AL- Sharakat district had been studied. The importance of this subject was fulfilled through the (pools / rain basins) in the area of the study which is considered seasonal valleys in Al- sharkat area. The water flows during the Winter and Spring during the fall of rain which is always heavy at irregular times in quantity and time. I have used both (cn-scs) and the pattern (Snyder) in the study of Hydrology features of the environments of water basins (pool) of the area of Al- sharkat in Saladdin province. I have made a comparison of the results of both ways to know if the application of these ways are suitable for the nature of the study area. the results have shown that the value of (cn-scs) that the fall of water may happen with the possibility of pointing the limit of the suitable place for exploiting the water of floods coming to Sharkat that can be useful in different fields while the pattern (TP) shows that whenever the value of (ct) the time of pools (basins) response to gain the top of flowing in the little steep. moreover, coefficients moving towards (0) and less than medium which is (254). this shows that water basin are weak in keeping water on the surface in flowing. Therefore, the quantity of flowing and increasing danges on the water basins in Al-Sharkat district.