Predicting Water Duty of Cultivation Farmlands in Babylon Governorate

In order to get perfect irrigation system and reduce waste in water of irrigation projects and control water scarcity which become one of hard problem in Iraq so have to predicting water duty for each project spatially in Babylon governorate and generally in Iraq governorates through calculating crops consumptive and cropping patterns to crops which planted and turn estimating the crops water duty after that calculating water duty of projects in order to be the delivery of water required to truly the field. The water duty can be defined as the crop need of water either field or farm turn out in field. The water duty includes crops evapotranspiration (ETc) in addition to crop consumptive (CU); the crop consumptive was very small compare with crop evapotranspiration by 1% therefore it can be neglected and the water duty depending on crop evapotranspiration only.The water duty considers from main determinants in design and operation of irrigation projects, also in best irrigation schedule of crops and represent less the amount of water was supposed to add to fill the shortage that getting from crops evapotranspiration to various the crops and various growing stages. The units of water duty was (m3/s/hectare) or (l/s/hectare) or (m3/s/don.) and in Egypt calculate (m3/Acres). In research depending on ministry of irrigation 1983 and data of 1971-2000 also data 2014-2017get on water duty of Eskandaria / between two river was 1.43 l/s/ha because rising of temperature in present time while water duty used 0.91 l/s/ha. The water duty in Musiab project was 1.05 l/s/ha while used 0.91 l/s/ha but in center of Babylon project was 1.04 l/s/ha while used 0.91 l/s/ha. The increasing of water duty in Eskandaria, Musiab and Center of Babylon governorate was 57%,16% and 14%, respectively. In research depending on Italy studies in ministry of water resource, 2014 get on water duty of Eskandaria / between two river was 1.98 l/s/ha while water duty used 0.91 l/s/ha. The water duty in Musiab project was 1.33 l/s/ha while used 0.91 l/s/ha but in center of Babylon project was 1.3 l/s/ha while used 0.91 l/s/ha. The increasing of water duty in Eskandaria, Musiab and Center of Babylon governorate was 118%,47% and 43%, respectively. The increasing because rising in temperature during the current years. The water duty in drip irrigation was the best from surface irrigation by half or less from amount of irrigation supplied therefore we recommend using trickle irrigation as the best method to water rationing and fill the shortage.