Problem 15 - 6 , p.556 in Vesilind, Morgan, and Heine. A hazardous waste landfil
ID: 1828142 • Letter: P
Question
Problem 15 - 6, p.556 in Vesilind, Morgan, and Heine.
A hazardous waste landfill is to be constructed, and some of the clay onsite is being considered for a clay liner. The requirement is that the hydraulic conductivity of the clay be less than 10-7 cm/s. A permeameter is set up and a test is conducted. If the depth of the sample in the permeameter is 10 cm, a head of 1 m of water is placed on the sample, the diameter of the permeameter is 4 cm, and it takes 240 hr to collect 100 mL of water draining out of the permeameter, what is the hydraulic conductivity of the sample? The conductivity may be calculated as K = V L / h A t where V = volume of water collected, L = depth of the sample, h = hydraulic head, A = cross-sectional area of sample, and t = collection time.
You may wish to read pp.268-272 in Davis and Masten.
Explanation / Answer
K= VL/hAt
=0.1*0.1/(1*pi*0.02^2*240*60*60)
= 9.21*10^-6 m/s
9.21*10^-4 cm/s