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lecture_13 - QW u a ’ 4 B h o& h S y ’ 4 Ttu a r 2 T...

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h o & h DRAWDOWN h o & h Q 4 B T W ( u ) W ( u ) ’ & 0.5772 & lnu % u & u 2 2 x2 ! % u 3 3 x3 ! & u 4 4 x4 ! % ..... u r 2 S 4 Tt S 4 Ttu r 2 T QW ( u ) 4 B ( h o & h ) T 114.6 QW ( u ) h o & h S 4 Ttu r 2 T 15.3 QW ( u ) h o & h S Ttu 260 r 2 LECUTURE 13 - NONEQUILIBRIUM AQUIFER TESTS 13.1 CONFINED AQUIFER THEIS EQUATION WHERE: Q = PUMPING RATE WHERE: t = TIME W(u) = WELL FUNCTION WHERE: T = GPD/FT WHERE: T = GPD/FT Q = GPM t = DAYS h -h = FT r = FT o WHERE: T = FT /DAY WHERE: T = FT /DAY 2 3 Q = GPM t = MINUTES
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if t > 30 r 2 w S T [1 & (10 r w / b ) 2 ] if r w B < 0.1 T QW ( u , r / B ) 4 B ( h 0 & h ) S 4 Ttu r 2 T QH ( u , $ ) 4 B ( h o & h ) S 4 Ttu r 2 h -h = FT r = FT o 13.2 LEAKY CONFINED AQUIFER DRAWDOWN WITH NO STORAGE IN THE AQUITARD AND WHERE: r = RADIUS OF WELL SCREEN w B = (Tb’/K’) 1/2 K’ = VERT. HYDRAULIC CONDUCTIVITY b’ = THICKNESS OF CONFINING BED WHERE: r/B = r/(Tb’/K’) (FROM PLOT) 1/2 K’ = (Tb’(r/B) )/r 2 2 DRAWDOWN WITH STORAGE IN THE AQUITARD WHERE: $ =r (S’/S)/16B (FROM PLOT) 2 2 2 B = T/(K’/b’) 2
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Unformatted text preview: QW ( u a ’ ) 4 B ( h o & h ) S y ’ 4 Ttu a r 2 T ’ QW ( u b ’ ) 4 B ( h o & h ) S y ’ 4 Ttu b r 2 K h ’ T b K v ’ ’ b 2 K h r 2 K’S’ = 16 $ Tb’S/r 2 2 13.3 UNCONFINED AQUIFER FOR EARLY DRAWDOWN FOR LATER DRAWDOWN WHERE: ’ = r K /(K b ) FROM PLOT 2 2 z h b = INIT. SATURATED THICKNESS 13.4 ASSUMPTIONS GENERALLY THE SAME AS FOR DEPUIT AND THEIM EQUATIONS EXCEPT FOR EXISTENCE OF EQUILIBRIUM CONDITIONS 13.5 PARTIAL PENETRATION OF WELLS THEIS SOLUTION GENERALLY VALID WHEN: r > 1.5b(K /K ) h v 1/2 SOLUTION NOT VALID WHEN: r < 1.5b(K /K ) h v 1/2 WHERE: b = INIT. SATURATED THICKNESS...
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