Lab 4 Solutions

# Lab 4 Solutions - CEIE 340 Lab 4 Solutions YHK Problem 1...

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CEIE 340 Lab 4 Solutions YHK Page 1 of 4 Problem 1. Problem 6.4 on page 354 Statement of the problem: What is the maximum velocity for Darcy’s Law to be valid in a given temperature of 60 ° F and a mean grain diameter of 0.04 inches? For Darcy’s Law to be valid R 1; therefore, for the maximum velocity: υ Vd R = or d V = Where, “ V” is the maximum velocity, “ d” is the diameter and “ υ is the kinematic viscosity The kinematic viscosity “ υ of water at 60 ° F is 1.217x10 -5 ft 2 /sec = 1.752x10 -3 in 2 /sec Therefore, sec / 0436 . 0 sec / 00365 . 0 ) 12 / 1 ( 04 . 0 sec / 10 217 . 1 2 5 in ft in ft in ft V = = × = Problem 2. Problem 6.9 on page 355 Statement of the problem: Two observation wells are 120 feet apart, with the difference in water-surface elevations of 0.15 feet. A tracer is injected into the well that has the higher water level, and a mean travel time of 3.75 days is measured. Find the hydraulic conductivity in units of miles/year and ft/day. This is a situation with non-radial flow. Neither of these wells is a pumping well; they are just being used to monitor the natural groundwater movement. The two equations needed to solve this problem are KiA Q = (equation 6.1 on page 329) and vA Q = where v = velocity, A = cross-sectional area, K = hydraulic conductivity, i = slope of the energy

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## This note was uploaded on 11/11/2009 for the course CEIE 340 taught by Professor Choudhury during the Spring '09 term at George Mason.

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Lab 4 Solutions - CEIE 340 Lab 4 Solutions YHK Problem 1...

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