Chapter 6, Problem 6.8.2P

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A slug test was made using a piezometer with a casing radius of 2.54 cm and a screen of radius 4.54 cm. The well was screened fully within a confined aquifer that was 3.3 m thick. The static depth to water in the piezometer is 10.5 cm. The remaining depths to water in the piezometer versus time are given in the chart below. Find the aquifer transmissivity using the Hvorslev method from the below data (time corresponding to each depthin order): Time (min)0, 1, 2, 3, 5, 7, 10Depth to water from surface (cm)5.4, 6.2, 6.8, 7.5, 8.4, 9.0, 9.510        9.5

For the constant head permeability test apparatus shown, cross-sectional area A flow, distance / between stand 78.5 cm² perpendicular to the direction Flow is vertically downwards through the sample. When the pipes = 10.0 cm. head loss h between the two standpipes is 5 cm, the volume of water which flows through the sample is 100 cm³ per minute. (a) What is the hydraulic gradient through the sample? Area A (b) What is your estimate of the coefficient of permeability k in cm/sec? How much (c) The exit point of the water is maneuvered so that the head loss h is increased 10 cm. water (in cm³) will flow through the sample in 2 minutes?

An artesian well is pumping water from a confined aquifer (thickness = 12 m) at a flow rate of 0.024 m3/s. The piezometric surface is 50 m above the bottom of the confining layer. In two monitoring wells (no pumping) located 15 m and 150 m away from the pumping well, steady-state drawdowns of 4 m and 1 m are observed, respectively. What is the intrinsic permeability of the aquifer (assuming the groundwater temperature is 15 ).

Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min

In a constant head permeameter test, the length of the specimen is 200 mm and the cross-sectional area is 78.5 cm2 . If k = 2.1 x 10-2 cm/sec, and a rate of flow of 130 cm3 /min must be maintained during the test, what should be the head difference across the specimen?

2500 cm3 of water was measured in 120 minutes for the experiment from a sample with a diameter of 15 cm and a length of 30 cm, on which the constant level permeability test was performed. There is a height difference of 2.5m between the level from which the water is taken and the fixed water level. Find the permeability coefficient of the test sample? (π=3.14) will be taken

A permeability test was carried out from a well that sunk through a surface layer of loose sand. Figure below shows the arrangement of pumping wells, together with relevant dimensions. Initially, the piezometric surface (ground water table) was located at a depth of 2.5m. When steady state was achieved at a pumping rate 38. 5 m, the following drawdowns were observed. hour Pumping well, d, = 3. 64m Observation well, d, = 0. 96m Observation well, d, = 0.48m %3D Calculate the coefficient of permeability of the sand in m/hr. 62 m 18 m GW.T 12 m Impermeable strata

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