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 Monteith utilizing satellite image data where the Landsat 5 TM image is used in this method. The estimated ETR C Rusing these two methods was of equal value, 5.20 mm/sec. This verifies the use of this satellite image for estimation of ETR C R. The agricultural situation and water demand of each canal and the corresponding cultivated area were evaluated. This evaluation shows that Al-Hussainiyah Canal has the highest value of discharge (12.43 mP 3 P /sec) with maximum cultivated area (89.82 kmP 2 P). The Al-ajmea Canal has the lowest discharge rate of (0.25 mP 3 P /sec), with minimum cultivated area of (0.39 kmP 2 P). 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 kmP 2 P /mP 3 P /sec. While the minimum value was at Al-ajmea canal 1.6 kmP 2 P /mP 3 P /sec. The average WUE for the area of study was 7.2 kmP 2 P /mP 3 P /sec, which is equal to the WUE of Al-Huassainiyah Canal. 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. INTRODUCTION rrigation policy makers and managers need information on the irrigation performance and productivity of water at various scales to devise appropriate water management strategies. This is not easy to obtain by using the field survey as many irrigation projects cover hundreds and sometimes thousands of square kilometers. Therefore, geomatics techniques especially satellite data can be used to monitor and evaluate the performance of the irrigation projects and water use efficiency and accordingly perform and develop an efficient management plans. In most of the irrigation projects there is no integrated evaluation for the performance of these projects and for the matching 4 T between the supplied discharges, the real demand for the cultivated lands and that specified in the agricultural plans and cropping patterns of these projects. 4 T Al-Hussainiyah Irrigation Project which is located in