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A cylindrical volume of soil contaminated with trichloroethylene (TCE). It is about 2.5 m deep and about 4.0 m in diameter. The porosity of the soil is approximately 0.25. The residual saturation of TCE NAPL averages Sn = 0.09. Assuming you could flush water through this zone at a rate of 240 L/day, estimate the minimum amount of time required to dissolve away the entire mass of TCE NAPL in the contaminated zone. Discuss how and why you think the actual volume pumped in a real clean-up situation would differ from what you have calculated.
The width of the river is 10 ft, the depth is 1 ft, longitudinal slope of 0.001, and the Manning's coefficients is 0.03. To estimate travel times and dispersion coefficients, you injected 50 gm of rhodamine dye at one bank of the river
An intersection approach volume is 1,500 veh/h and includes 12% left turns with a through-vehicle equivalent of 2.3 tvu's/left turn. What is the total equivalent through volume on the approach
Solid waste will be applied in 0.6 m "lifts" and will be compacted to a depth of 0.3 m. Daily cover soil will be applied to a depth of 0.15 m for the first four days of the operation in any week. At the end of the fifth day, a "weekly cover" layer..
What thickness of HMA would be required to carry the same traffic (computed in B) if there is a loss of serviceability due to frost heave of 0.8? Assume that the thickness other two layers would not be changed.
water from a treatment plant is pumped into distribution system at a rate of 4.38 m^3/sec, a pressure of 480 kpa and a temperature of 20 degree celcius. The pipe has a diameter of 750 mm and is made of ductile iron
Determine the force in each of these rods. Neglect axial compression and shear in the beam. For the beam, Ib = 200(106)mm4, and for each tie rod, A = 100mm2. Take E = 200 GPa.
Water enters a pipe at 100 psig and 70 degrees F. The density of water under these conditions is 62.3 lbm/ft^3. The pipe has an inside diameter of 4.5 inches. The mass flow rate of the water is measured to be 7500 lbm/hr.
A pipeline 900 ft long discharges freely at a point 200 ft lower than the water surface at intake. The pipe intake projects into the reservoir. The first 600 ft is of 10-in diameter, and the remaining 300 ft is of 6-in diameter. Find the rate of disc..
If bod5 and ultimate bod of a municipal wastewater are 200mg/l and 457 mg/l respectively what is the reaction rate constant? a) .265 b) .050 c) .115 d) .165
A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope 1:1 is to drain water uniformly at a rate of 8 m^3/s to a distance ok 1 km. If the flow depth is not to exceed 1.2 m,
A 2.0-ft^3 object weighing 650 lb is attached to a balloon of negligible weight and released in the ocean (γ = 64 lb/ft^3). The balloon was originally inflated with 5.0 lb of air to a pressure of 20 psi.
A weight W somewhere between 1 to 10 tons is randomly placed along a beam of 10m long span. Let X denote the distance from the point of applicatoin of the load to the nearest support.
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