Hydrological assessment of the possibility of rainwater harvesting (Al-Hafi Valley case study)

Abstract

Al-Hafi Valley Basin is one of the secondary basins of the great chatter Basin, which is located in the Jazira region of Anbar governorate to the west of chatter Lake and is astronomically located between two circles of Latitude (33° 45' 35" - 33° 53' 5")  north and bow lengths (42° 53' 20" - 43° 7' 40") eastern Meridian, covering an area of (106.249) km², the study aims to estimate the volume of surface runoff in the Al-Hafi Valley Valley basin for water collection purposes, as it was based on the American mathematical model (SCS-CN), and it is also one of the most accurate mathematical methods to obtain surface runoff results by determining the vegetation cover varieties and hydrological groups of soils represented by varieties (A,B), the study showed the degree of difference between these basins in their hydrological characteristics, The values (GN) and (10) ranged between (49-86), while the weighted values (GN) in the main basin of Valley Al-Hafi reached (82.22), and in the secondary basins ranged between (83.94) as the highest value and (80.92) as the average value as the lowest value, which gives the impression that there is a possibility of high runoff in the study area due to the high GN values.

The results of the study indicated the possibility of using a water catchment system in the study area, as the study proposed three hypothetical sections of dams for storing rainwater during the rainy season and using it in different areas (expansion of pastures, development of agricultural land, creation of settlements).