. The difference between the free water levels in two wells 48 m part in an aquifer is 0.6m. It took an interval of 8 hours between detecting the traces of a tracer material at the two wells in succession. The porosity of the aquifer is 25%. The coefficient of permeability of the aquifer is_______ cm/sec.

. The difference between the free water levels in two wells 48 m part in an aquifer is 0.6m. It took an interval of 8 hours between detecting the traces of a tracer material at the two wells in succession. The porosity of the aquifer is 25%. The coefficient of permeability of the aquifer is_______ cm/sec.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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2 The difference between the free water levels in two wells 48 m apart in an aquifer is 0.6 m. It took an interval of 8 hours between detecting the traces of a tracer material at the two wells in succession. The porosity of the aquifer is 25%. The coefficient of permeability of the aquifer is ........ cm/sec.
2. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in days
Determine the following: a) depth of water in the test well is ______ m b) Transmissbility of the impermeable layer is _____ sq.m/s c) Permeability of the aquifer is ____ m/s
PROBLEM 1: A sample of sand, 5 cm in diameter and 15 cm long, was prepared at a porosity of 60% in a constant-head apparatus. The total head was kept constant at 30 cm and the amount of water collected in 5 seconds was 40 cm?. The test temperature was 20°C. the Calculate coefficient of permeability? a. 0.261 cm/s b. 0.960 cm/s c. 0.204 cm/s d. 0.178 cm/s
Given the following: H1 = 1.5 m H2 = 3.0 m H3 = 2.0 m K1 = 0.001 cm/sec K2 = 0.032 cm/sec K3 = 0.000041 cm/sec 1. Find the effective average permeability of the deposit in the horizontal direction. (in cm/s) 2. Find the effective average permeability of the deposit in the vertical direction. (in cm/s) 3. What is the ratio of the equivalent hydraulic conductivity?
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
The results of a constant-head permeability test for a sand sample having a sectional area of 10000mm2 and a length of 200 mm are as follows: (1) Constant head difference 400mm (2) Time of collection of water = 30 seconds (3) Volume of water collected = 600 cm3. The hydraulic conductivity is: Oa. 1.0 mm/sec Ob. 1,7mm/sec c. 2.9 mm/sec O d. 0.5mm/sec
A 30 cm well penetrates 45 m below the static water table. After a long period of pumping at a rate of 1200 lpm, the drawdown in the wells 20 m and 45 m from the pumped well is found to be 3.8 and 2.4 m respectively. Determine the transmissivity (-K*aquifer thickness) of the aquifer. What is the drawdown in the pumped well? [Hint: Use water table depth as aquifer thickness in the case of unconfined aquifer]
For a constant head permeability test in a sand, the following values are given:• L 350 mm• A 125 cm2• h 420 mm• Water collected in 3 min 580 cm3• Void ratio of sand 0.61Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
For a falling-head permeability test, the following values are given: Length of specimen = 200 mm Area of soil specimen = 1000 mm^2 Area of standpipe = 40 mm^2 Head difference at time t = 0 = 500 mm Head difference at timt t = 3 minutes = 300 mm Determine the hydraulic conductivity of the soil in ×10−4cmsec Please answer this asap. For upvote. Thank you very much
From constant head permeability test on fine sand, the following data were recorded: Length of sample = 16 cm Diameter of sample = 9.6 cm Constant head difference = 50 cm Volume of water collected in 4 minutes = 420 cm3 Find the discharge velocity in cm/sec. O 0.163 cm/s O 0.184 cm/s 0.095 cm/s O 0.024 cm/s