Razack, et al, 1991) tried to determine Transmissivity through specific capacity data, then (Keith J. Ballukraya, et al,1991) it derived an equation to estimate Storativity by recovery test, Also (M.
WELL DRAWDOWN MATH SKIN
The most important method to estimate the aquifer parameters are testing with having observation well, but it's cost more than conducting pumping test without observation well which is called single well test, so that since the last decade there are many experiences that are tried to discover a method to estimate the aquifer parameters through analyze single well test data such as (choi,Byung-soo,2007)which tried to find out the Storativity by determining skin factor and effective wellbore storage, and the method of (P. Keywords: aquifer parameters, single well test, Cooper-Jacob's straight line method 1. A kind of single well test,which is step-drawdown test used to determine the efficiency and specific capacity of the well, however in case of single well test it is possible to estimate Transmissivity, but the other parameter which is Storativity is overestimated, so the aim of this study is to analyze four pumping test data located in KAWRGOSK area by using cooper-Jacob's(1946) time drawdown approximation of Theis method to estimate the aquifer parameters, also in order to determine the reasons which are affecting the reliability of the Storativity value and obtain the important aspect behind that in practice. PhD, Civil Engineering Department, College of Engineering, University of Salahaddin, Erbil, Kurdistan Region of Iraq, e-mail: JWAN SABAH MUSTAFA - Engineer, General Directorate of Dams and Reservoirs, Ministry of agricultural and water resources, Erbil, Kurdistan Region of Iraq, e-mail: Single well test is more common than aquifer test with having observation well, since the advantage of single well test is that the pumping test can be conducted on the production well with the absence of observation well. PERFORMING PUMPING TEST DATA ANALYSIS APPLYING COOPER-JACOB'S METHOD FOR ESTIMATING OF THE AQUIFERĭANA KHIDER MAWLOOD - Assist. What is the drawdown?Ī well has a calculated specific capacity of 30 gpm per foot and operates at a flow rate of 1.08 MGD.Mathematical Modelling in Civil Engineering The well operates at a constant 1,500 gpm. What was the average specific capacity for the year?Ī well has a specific capacity of 42 gpm per foot. The pumping level averaged 55 ft bgs for half the year and 68 ft bgs the other half. For half the year the static water level was 25 ft bgs and half the year 42 ft bgs. If the original drawdown was 42 ft what is the current specific capacity?Ī well pumped 538 AF over a one year period averaging 10 hours of operation per day. In addition, the drawdown has decreased by 15%. The efficiency of the well has dropped 35%. When a well was first constructed it was pumping 1,750 gpm. After 3 hours of operation, the well produced 279,000 gallons. What is the pumping level of the well?Ī well has an hour meter attached to a water meter totalizer. A drawdown has been calculated out to be 65 ft. If the drawdown on this well is 44 ft and the pumping level is 80 ft bgs, what is the static water elevation above sea level?Ī deep well has a static water level of 122 ft bgs. What is the drawdown?Ī groundwater well has a base elevation of 1,125 ft above sea level. \)Ī well has a static water level of 23 ft bgs and a pumping level of 58 ft bgs.
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