Assuming that the well completion can be selected in such way that both sides would have the same pressure drop, the pump pressure head is simply two times drawdown pressure (2Delta P_{{{text{b}}.{text{p}}.}}).
Aquifer parameters were determined by fitting observed time-drawdown data to one of the type curves and selecting a match point.
Based on such characteristics of the time-drawdown curve, we developed a new method to estimate the aquifer parameters by using the genetic algorithm.
For the chosen match point, four parameters (two from each axis of both observed time-drawdown curve and type curve) are read, and the aquifer parameters were computed using Eqs.
At present, several softwares are available for analyzing the pumping test data, but most of them do not contain a method for analyzing the time-drawdown data of the large-diameter wells.
The measured and computed drawdowns were compared to evaluate the efficacy of the developed spreadsheet programs and matching of the observed time-drawdown and type curves by employing two performance criteria: correlation coefficient (R) and root mean square error (RMSE).
To identify the reason behind the rapidly starting drawdown of wells, the time-drawdown hydro-geological analysis should be comprehended, which includes understanding the development procedures of the cone of depression (Heath 1983) which occurs in an aquifer when groundwater is pumped from a well.
A further northward movement of the humid and desert zones occurred at the time of drawdown.
It's drawdown time and pretty soon we'll be out like we got out of Vietnam, like we got out of other colonial wars.'" He said the defense minister had made no mention of the NATO decision in a statement on Monday.
Drawdown time values determined for surface additions followed the same trends reported for traditional impellers.
