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A saturated aquifer sample core of diameter 2.54 cm and length of 6 cm weighs 63 grams. After drying the sample weighs 53 grams. The core sample was placed into an permeameter and exposed to a unit hydraulic gradient. The measured flowrate was 25.4 milliliters/second. The water levels in three wells in the same aquifer were measured in meters above MSL. The levels were: Well MW-1: 83.1 m; Well MW-2: 84.6 m; Well MW-3: 83.9 m. Well MW-2 is located 1km due north of Well MW-1, and Well MW-3 is located 700 meters Northeast of Well MW-1. Determine: 1. Estimate the porosity of the aquifer. 2. Estimate the hydraulic conductivity of the aquifer. 3. Sketch the relative positions of the three wells. Use MW-1 as the origin of the local (your sketch) coordinate system, and North is to the top of your sketch. 4 Determine the magniture and direction of the hydraulic gradient in the aquifer monitored by the three wells Indicate the hydraulic gradient on your sketch

A saturated aquifer sample core of diameter 2.54 cm and length of 6 cm weighs 63 grams. After drying the sample weighs 53 grams. The core sample was placed into an permeameter and exposed to a unit hydraulic gradient. The measured flowrate was 25.4 milliliters/second. The water levels in three wells in the same aquifer were measured in meters above MSL. The levels were: Well MW-1: 83.1 m; Well MW-2: 84.6 m; Well MW-3: 83.9 m. Well MW-2 is located 1km due north of Well MW-1, and Well MW-3 is located 700 meters Northeast of Well MW-1. Determine: 1. Estimate the porosity of the aquifer. 2. Estimate the hydraulic conductivity of the aquifer. 3. Sketch the relative positions of the three wells. Use MW-1 as the origin of the local (your sketch) coordinate system, and North is to the top of your sketch. 4 Determine the magniture and direction of the hydraulic gradient in the aquifer monitored by the three wells Indicate the hydraulic gradient on your sketch

Principles of Geotechnical Engineering (MindTap Course List)
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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A saturated aquifer sample core of diameter 2.54 cm and length of 6 cm weighs 63 grams. After drying the sample weighs 53 grams. The core sample was placed into an permeameter and exposed to a unit hydraulic gradient. The measured flowrate was 25.4 milliliters/second. The water levels in three wells in the same aquifer were measured in meters above MSL. The levels were: Well MW-1: 83.1 m; Well MW-2: 84.6 m; Well MW-3: 83.9 m. Well MW-2 is located 1km due north of Well MW-1, and Well MW-3 is located 700 meters Northeast of Well MW-1. Determine: 1. Estimate the porosity of the aquifer. 2. Estimate the hydraulic conductivity of the aquifer. 3. Sketch the relative positions of the three wells. Use MW-1 as the origin of the local (your sketch) coordinate system, and North is to the top of your sketch. 4. Determine the magniture and direction of the hydraulic gradient in the aquifer monitored by the three wells. Indicate the hydraulic gradient on your sketch (direction and magnitude) 5. Estimate the concentration of a conservative constituient (contaminant) at a receptor 4 km away from MW-1 on a flowline that passes through MW-1 using the Ogata-Banks model, assuming MW-1 is at the source location, and the source concentration is 1000 mg/l. Use one-tenth of the path length as the aquifer dispersivity (recall dispersion coefficient is the product of dispersivity and average linear velocity). Calculate the receptor concentration from 0 days after release to 1000 days after release in 10 day increments, and make a concentration history plot for the receptor location. 6. An estimate of the time from release until the concentration at the receptor is 500 mg/L.
Transcribed Image Text:A saturated aquifer sample core of diameter 2.54 cm and length of 6 cm weighs 63 grams. After drying the sample weighs 53 grams. The core sample was placed into an permeameter and exposed to a unit hydraulic gradient. The measured flowrate was 25.4 milliliters/second. The water levels in three wells in the same aquifer were measured in meters above MSL. The levels were: Well MW-1: 83.1 m; Well MW-2: 84.6 m; Well MW-3: 83.9 m. Well MW-2 is located 1km due north of Well MW-1, and Well MW-3 is located 700 meters Northeast of Well MW-1. Determine: 1. Estimate the porosity of the aquifer. 2. Estimate the hydraulic conductivity of the aquifer. 3. Sketch the relative positions of the three wells. Use MW-1 as the origin of the local (your sketch) coordinate system, and North is to the top of your sketch. 4. Determine the magniture and direction of the hydraulic gradient in the aquifer monitored by the three wells. Indicate the hydraulic gradient on your sketch (direction and magnitude) 5. Estimate the concentration of a conservative constituient (contaminant) at a receptor 4 km away from MW-1 on a flowline that passes through MW-1 using the Ogata-Banks model, assuming MW-1 is at the source location, and the source concentration is 1000 mg/l. Use one-tenth of the path length as the aquifer dispersivity (recall dispersion coefficient is the product of dispersivity and average linear velocity). Calculate the receptor concentration from 0 days after release to 1000 days after release in 10 day increments, and make a concentration history plot for the receptor location. 6. An estimate of the time from release until the concentration at the receptor is 500 mg/L.
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