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,. <br /> Graphioal Well Anal Sia Packnga <br /> Unconfined Aquifer _ <br /> aquifers respond to a removal of water due to pumping, <br /> Unconfined aq � aquifer is <br /> differently than confined aquifers. When a confined aq <br /> pumpad, the water 1 ithdrawn through re se in pressure)aand 2) compactioncombination Of ' of the <br /> expansion (due to a decIs <br /> aquifer. In an unconfined aqu ,ltselfr(as removed <br /> table Is <br /> through dewatering of the aquifer <br /> Lowered In response to pumping), in addition to the mechanismsnfined s. <br /> respon.9ible for removing water from storage in cakexity at tha <br /> This dewatering of the aquifer increases the <br /> storage rCoe Ales of the aquifer. <br /> solution for the trans <br /> I unco linea aquifer system showing the <br /> A diagram of a typ <br /> -- variables necessary for obtaining a solution for the tr.�.nsm[ssiv ty <br /> and storage propertles is shown in Figure [3-3. <br /> pbsMvalien - <br /> Pimpi•,9 well Weli <br /> 0 <br /> ..- � - [onA Sur los• <br /> Ga919�1 w9l::_fa0 l L_ _-................ <br /> AQUIFER <br /> AQUICLUCE <br /> l <br /> Figure B7-3. Diagram of an unconfined aquifer system (modified <br /> after Walton, 1978)- <br /> fined aqjifer to theof w <br /> hdrawal <br /> w The response at ben uncon <br /> d scribed by,three separate tphases. First,tthe <br /> from a well canto the <br /> early response to pumping is analogous led is due sto expansion confined ithe <br /> aquifer in which the water being Supp phase causes the <br /> water and compacaioa of the aquifer. This <br /> plecometric surfacQ to fall below the level of far he aquifer he water ithe <br /> unconfined aquifer. The calculated storetivtty <br /> during this phase would be low since relatively xlttactiont ai lthe <br /> available through expansion of the water and comp <br /> aquifer. If a plot at drawdown vs. time was constructed, the shape <br /> of the curve produced would be the same as the Theis curve. <br /> pump test is characterized by the <br /> Second, the middle pari of thb <br /> Initiation of dewator[ng of the uaconflned aquifer. Drainage of the . <br /> B.6 <br />