文档介绍：,avelocity,m/=K[m/day].b[m]Permeabilitysymbolk,“littlek”hasunits[m2]k=Km/rgwheremisthedynamicviscosity[kg/]andKhasunitsm/secWaterProductionWellCasing,screen,centrifugalpumpOutercasing>12”abovegradewithcementgrout,lowercasingwithgroutseal,pumpinscreen,sandgravelpack,developedRadialFlowThedrawdownoftheGWTduringflowfromawellvarieswithdistance,,-ConfinedAquiferIftheaquiferisconfined,thecylinderhasheighth=b,andDarcy’sEquationforflowcanbeintegratedforasolutionforrandh:[.(m/sec).m/m]SeparatethevariablesrandhAreaxKxdh/drsumtermsinr=constantsxsumtermsinhdlnr=1/rdrdh=dhso:Tosolveweintegrate(getthetotalarea),-ConfinedAquifer SolveforTIfwesolveforT=Kbweget:WewillgothroughExample8--UnconfinedAquiferIftheaquiferisunconfined,thecylinderhasheighth,andDarcy’sEquationforflow :SuchexpressionscanbesolvedforKRadialFlow-UnconfinedAquifer SolveforKIfwesolveforKweget:WewillgothroughExample8-,avolumeofpurewaterisaddedtothewellandobservationsofdrawdownarenotedthroughtimeSlugtestsareoftenpreferredathazardouswastesites,=radiusofcasingy0=verticaldifferencebetweenwaterlevelinsidewellandwaterleveloutsideatt=0yt=verticaldifferencebetweenwaterlevelinsidewellandwate