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Problem Set No. 3 2009

Problem Set No. 3 2009 - 20 ◦ C 2 3(3 points The...

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1 Student’s Name: GEOL 4320/5328 Hydrogeology Fall 2009 Homework Problem Set #3 (15 points) (Due: Sep. 30, 2009 ) 1. (3 points) The hydraulic conductivity of medium-sized sand was measured as 11.2 m/day in a laboratory test with water at 25°C. (A) What is the intrinsic permeability of the sample in square micrometers? (B) What is the expected in-situ hydraulic conductivity if the natural groundwater temperature is 10°C? 2. (3 points) A constant-head permeameter has a cross-sectional area of 127 cm 2 . The aquifer sample is 34 cm long. At a head of 15 cm, the permeameter discharges 50 cm 3 in 334 s. (A) What is the hydraulic conductivity in centimeters per second and feet per day? (B) What is the intrinsic permeability if the hydraulic conductivity was measured at
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Unformatted text preview: 20 ◦ C? 2 3. (3 points) The stratification of an aquifer is shown below. Calculate the equivalent horizontal and vertical hydraulic conductivities. What is the degree of anisotropy? 4. (6 points) Using the tabulated results of a grain size distribution test on a field sample, perform the following tasks: (A) Plot a grain size distribution curve for this sample (hint: you need to get the grain size for each sieve number from the lecture note) (B) Is this a well-sorted or poorly-sorted sample? (poorly-sorted materials have a uniformity coefficient > 6) U.S. Standard Sieve Number Mass retained (g) 3/8 49.95 4 26.70 8 25.29 16 50.58 30 72.57 40 25.50 100 33.60 200 7.53 Pan (passes through #200 sieve) 8.28...
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