52.560.0 71.587.8 101.5 120 130.5 141 150 Question 2: (Unsteady state - unconfined parameters) The drawdown versus time

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52 560 0 71 587 8 101 5 120 130 5 141 150 Question 2 Unsteady State Unconfined Parameters The Drawdown Versus Time 1 (55.88 KiB) Viewed 14 times

52.560.0 71.587.8 101.5 120 130.5 141 150 Question 2: (Unsteady state - unconfined parameters) The drawdown versus time data corresponding to an observation well at r 90 m distance from the pumped well. The steady state flow rate is Q - 873 m/day. The average saturated thickness of the unconfined aquifer before pumping was 22 m. Determine the values of the parameters using a) Boulton's type curve method, and b) Neuman's type curve method. i transmissivity 'T'. ii- horizontal hydraulic conductivity 'K', iii- storage coefficient (storativity) 'S'. iv- specific yield 'Sy'. V- delay index '1/a'. vi- specific yield - storage coefficient relationship parameter n time tº (min) Drawdown 's' (cm) 0 0 1.8 1.1 3 3.5 9 6.1 20 11.0 30 12.5 50 14.3 90 15.4 120 16.3 185 16.7 300 18.7 420 19.9 1440 21.8 1550 22.4 I alry confined - parameters by Walton curves) all confined by a semi-pervious