The obtained results were found to be corresponded to the unconfined nature of in the encountered aquifers in A1, A2, A3, A4, A5, A6, A7, A8, and B1, B2, B3, B4 wells, and this is clearly indicated in the storage coefficient (specific yield) of this aquifer in these wells. The large transmissivity of the Disi aquifer is indicated between 541 to 656 m 2 /day of yielding wells and the storage coefficient in the range 0.0199 to 0.0260, the specific capacity in range 5.9 to 7.11 l /s /m. The most important feature of the Rum aquifer is its homogeneity in the grain size ranges between 0.25mm to 0.51mm sand, the uniformity coefficient ranges between 1.36 to 2.19 at different formations depth between 330m to 520m, medium to fine and medium to coarse uniformly graded sand of different formations. The Rum aquifer system represents an unconfined aquifer system in the area in which no deposition of Khreim group where Khreim group overlies the Rum sandstone deposits. The groundwater flows from the Saudi Arabia in the South towards North East Jordan in central Jordan. In effect, then, the total drainage area is being depleted at a constant rate.
WELL DRAWDOWN TEST SKIN
The pressure starts declining at the same rate at all points in the reservoir hence the name pseudo-steady-state. Determination of formation permeability and well skin fac- tor is important for forecasting flow rates of oil and gas wells. The Disi aquifer, which is the main source of water for Mudawara Region, is one of the most permeable and productive Sandstone aquifers in the Jordan. When a constant-rate drawdown test is run for a long period of time, the boundary effects eventually dominate the pressure behavior at the well. The rock formations constituting the Rum group compose the Rum aquifer system, which dominates the fresh water aquifer system in southern Jordan which the aquifer system in southern Jordan which the rock formations constituting the Khreim group represent the confining layer where Sahl Suwaan formation occur. The major disadvantage is the difficulty of maintaining a constant production rate. The main technical advantage of drawdown testing is the possibility for estimating reservoir volume. These formations are Saleb, Burj, Umm Ishrin, Disi, and Umm Sahm formations. Skin effect concept of head losses in vicinity of well due to varying hydraulic conductivities. Properly run drawdown tests may provide information about formation permeability K, skin factor, S, and the reservoir volume communicating with the well. The aquifer is composed of rock units overlaying the basement complex of the Precambrian ERA are subdivided into two groups: the upper group is called Khreim group, and the lower group is the Rum group.
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