Question

I. The drawdown data shown below is from a monitoring well located a distance 25 m from the pumping well in the direction of a surface water reservoir. The data shows that the confined aquifer is in hydraulic communication with the reservoir. If the average pumping rate is 550 m/d, estimate the transmissivity (8 pts) and storage coefficient (7 pts) of the aquifer Time (d) Drawdown (m) Time (d) 0.012 1 0.020 1.6 0.050 0.09 0.12 0.14 Drawdown (m) Time (d) Drawdown (m) 3.25 3.55 3.95 4.12 4.33 4.47 1.28 2.25 2.70 2.90 3.00 0.2 0.3 0.6 0.9 1.5 15 30 45 60 90 4.52 4.60 4.61 4.62 4.63 4.63

Answer 1

G ell leatdt ot dsbce sm he alenge Puate ven a rate 550 d The en datasto be Shoan belo 0, 012 28 3.2S 62 o 050 .25 02.0 15 t6o 4.61 2 Y63 63 09 YS Go 4.33 2.00 To determtne the s ope 62-1.28 6.34 T303 2.30 3x 550 чтхо、34

.303x 550 (266 G5 чт хозу 266.65 : 296.5 -το estnde To emate the. Soraqe Coeicient'1 9.012 921012 ime

2 (&5) 25x296 5x1.S 62S (000. 68S 6aS Simnflarly to Calaulate all tte otter values mt la