Assessment of the Water Situation in the Western Region
Assessment of the Water Situation in the Western Region
Assessment of the Water Situation in the Western Region
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‣ In a supply group or demand group, two different types <strong>of</strong> supplies (e.g. TSEand desal<strong>in</strong>ated water) or demands cannot be mixed. In this way, waters aredistributed accord<strong>in</strong>g to standards <strong>of</strong> quality required for each specific useDemands:‣ <strong>Water</strong> supply demand is derived from population and per-capita daily grosswater demand. The 2001 Abu Dhabi population census is used as <strong>the</strong> basis for<strong>the</strong> population projections, and updates are taken from <strong>the</strong> Abu Dhabi Plann<strong>in</strong>gDepartment annual population statistics.‣ Amenity water supply demand is determ<strong>in</strong>ed from irrigated area and vegetationwater demand‣ Forest water demand is derived from net forest area and gross irrigation water.Landsat imagery is used to determ<strong>in</strong>e gross areas.‣ Farm water demand is derived from net farm area and gross irrigation waterrequirement. Landsat imagery is used to determ<strong>in</strong>e gross areas.‣ Each demand centre may be l<strong>in</strong>ked to a number <strong>of</strong> supply sources.‣ Demand from human settlements must be satisfied from potable sources.‣ Crop, forest and amenity demand is estimated <strong>in</strong> <strong>the</strong> SDM us<strong>in</strong>g Global Sett<strong>in</strong>gsfor crop water use, cropp<strong>in</strong>g-plant<strong>in</strong>g patterns and irrigation efficiency.Sources:‣ For sources, an output capacity is specified, while constra<strong>in</strong>t factors may limitthis capacity. Constra<strong>in</strong>ts may not directly relate to <strong>the</strong> source but may relate to<strong>the</strong> l<strong>in</strong>ks between sources and demand centres (such as conveyance pipel<strong>in</strong>ecapacity and <strong>in</strong>termediate storage capacity). The user can specify both real andvirtual (future unbuilt) l<strong>in</strong>ks.‣ Individual supply sources may be l<strong>in</strong>ked to more than one demand centre.‣ Sewage effluent source (TSE) use is restricted; TSE can only supply demand foramenity plant<strong>in</strong>g irrigation and no o<strong>the</strong>r use;‣ TSE output cannot exceed works treatment capacity; for <strong>in</strong>dividual sewageplants‣ Groundwater source output cannot exceed well pump capacity and is reducedl<strong>in</strong>early with falls <strong>in</strong> well water levels.‣ Except for TSE sources, no restriction applied to sources meet<strong>in</strong>g demand fromfarms and forests.‣ For desal<strong>in</strong>ation plants, output set at 90% <strong>of</strong> plant Design Capacity. Plant outputis varied accord<strong>in</strong>g to feed sal<strong>in</strong>ity.27
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