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analysis application of equation approximation of figure aquifer h aquifer Lower aquifer aquifer penetrated aquifer Stabilized water aquifer's discharge artesian head assumed changes in head Chester County constant drawdown constant-drawdown test determination discharge due drawdown pattern entrance losses equation 9 essen field procedures figure 50 figure 51C figure 52A fluctuations in artesian fluctuations in head G function GEOLOGICAL SURVEY head of lower head of middle head of upper hL Static head imated indicated INDIVIDUAL AQUIFERS Jacob and Lohman level after completion level after penetration lowermost aquifer measurement method middle aquifer tb multiaquifer obtained order-of-magnitude significance original hydrostatic head original internal discharge penetration of lower penetration of middle piezometric surface plot prior to pumping problem second step shortly after penetration showing fluctuations shown in figure single-step change Stabilized water level step function stepwise approximation storage coefficients subtraction t—ti test results theory three-aquifer transmissibility and storage upper aquifer values various aquifers
Page 181 - for determining the transmissibility and storage coefficients and the original hydrostatic head of each aquifer penetrated by a multiaquifer well. The procedure involves pumping the well in such a manner that the drawdown of water level is constant while
Page 181 - discharges of the different aquifers are measured by means of borehole flowmeters. The theory is developed by analogy to the heat-flow problem solved by Smith. The internal discharge between aquifers after the well is completed is analyzed as the first step. Pumping at constant drawdown constitutes the second step. Transmissibility and storage coefficients are determined by a method described by
Page 181 - coefficient, which is highly sensitive to experimental error, must be rejected. It is felt that better results may be achieved in the future, as
Page 181 - computation may permit determination of the response of each aquifer in the well to any form of
Page 181 - the first step of the analysis. The method was tested on a well in Chester County,
Page 181 - methods of flow measurement and, probably, to the effects of entrance losses in the well. The
Page 181 - of entrance losses. If accurate data can be obtained, recently developed techniques of digital or
Page 181 - and the original hydrostatic head of each aquifer penetrated by a multiaquifer well.
Page 181 - head can be accepted as having order-of-magnitude significance, but the determinations of the