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Observation well, Single well, Transmissivity
In general, for determining aquifer parameters pumping test conducted on the production well, since in Erbil catchment area observation wells are not exist. In the present study steady state pumping test method using single well was used to estimate the tranmissivity of the aquifer. For this purpose pumping test conducted on a single production pumping well at the specific area which is located at the QATAWI area near Erbil city. The results of transmissivity obtained from single well pumping test data compared with that obtained from observation well. The value of Transmissivity calculated from the field data via pumping test on single pumping well equal to 13.05 m/day however its value obtained from observation well equal to 197.7 m/day. It was observed that there are differences between the results of transmisivity of the aquifer using single pumping well and observation well. It is result using observation well is higher than observation well; this is mostly due to the losses that are available within the pumping well. To get a real value of transmissivity of the aquifer the pumping test should be conducted on an observation well or adjustment of the data after single well testing.
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