Congress Groundwater and society : 60 years of IAH September 25 - 29 th 2016 Montpellier , France Organized by The French and German National Chapters of the International Association of Hydrogeologists

During the last decades there is low flow in the Euphrates River then consequently low flowin Hilla River which is branch of Euphrates River, Iraq. The Tyass Barrage constructed to lift thehydraulic head upstream in Hilla River raised the groundwater table above ground surface.Environmental problems have been occurred in Hashimyia Area, Babylon Governorate, causingflooding an area of about 9 km2 called the TYASS SECTOR and drought of some other local streams.The Hashimyia Area is flat area located in the Mesopotamian plain which is consisting of Tigris andEuphrates rivers recent deposits. Prevailing sediments are sand, silt and clay forming alternative bedsof Flood Plain sediments. To reconstructing the water managements within the area and rehabilitatingthe natural water resources, a two dimensional mathematical model has been developed to overcomesuch problem. Sixteen wells were drilled within the Hashimyia area to achieve the pumping test and tocalculate the Transmissivity values, evaluating of the safe yield of the bearing layer to assignwithdrawal rates to lower the water table and to analyze the groundwater characteristics. The lowwithdrawal rate of Tyass sector is attributed to shallow and horizontal extent water bearing layer. Thedesigned model is proved total pumping discharge of 68 liter sec that can deplete the bearing layerwithin Tyass sector and produces a maximum drawdown of 4.25 m at the center. The current modelwill provide the scientific plat form for decision maker to execute any environmental application andwater management. The governance of groundwater and the state-community comanagement continuumAbstract n°1573 Molle (orateur) François, Montpellier cedex 5, France [email protected] Closas Alvar, IWMI, Cairo, Egypt