Evaluation of Total Demand For Al-Hussainiyah Irrigation Project Using Geomatics Techniques

Abstract

In this paper, the crop water requirement was calculated using two methods; the first method is FAO-56-Penman Monteith. While the second method, is the Penman Monteithutilizingsatellite image data where the Landsat 5 TM image is used in this method. The estimated ETCusing these two methods wasof equal value,5.20 mm/sec.This verifies the use of this satellite image for estimation of ETC. The agricultural situation and water demand of each canal and the corresponding cultivated area were evaluated.This evaluation shows that Al-HussainiyahCanal has the highest value of discharge (12.43 m3/sec) with maximum cultivated area (89.82 km2). The Al-ajmea Canal has the lowest discharge rate of (0.25 m3/sec), with minimum cultivated area of (0.39 km2).These canals operate under half of their design discharge and the cultivated area for this project distributed mainly along the main canals. Evaluation of the water use efficiency (WUE)of the project shows that the maximum value of the estimated WUE was at Al-kamalea canal 7.9 km2/m3/sec. While the minimum value was at Al-ajmea canal 1.6 km2/m3/sec. The average WUE for the area of study was 7.2 km2/m3/sec, which is equal to the WUE ofAl-HuassainiyahCanal.It has been proven that the Landsat 5 TM image can be effectively used in monitoring irrigation network, especially when considering large areas. It can be used for estimating and evaluating the water consumption and the water use efficiency of the irrigation projects in Iraq.