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A pre-sedimentation basin has been designed that reduces the river water suspended solids concentration from 500 to 200 mg/L. How many pounds of dry solids does this represent per million gallons of treated water? If the specific gravity of these solids is 2.60 (e.g. the solids have a density 2.6 times that of water, or about 2.6 g/mL) and the sludge removed has a solids concentration of 2% (on a volume basis), what volume of sludge must be removed every week at a design flow of 4 million gallons per day (MGD).
A consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle of 28°. If the all-round confining pressure during the test was 140 kN/m2, what was the major principal stress at failure.
develop a spreadsheet application that will display in a table the values of modulus of elasticity Ec for concrete having unit weight ranging from 95 pcf to 155 pcf (in steps of 5 pcf) and compressive strength ranging from 3500 to 7000 psi
Two ships A and B are moving with constant speeds Va and Vb along straight intersecting courses. The navigator of ship B notes the time rates fo change of the separation distance r between the ships and the bearing angle theta.
Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
A crest vertical vurve and a horizontal curve on the same highway have the same design speed. The equal-tangent vertical curve connects a +3% initial grade with a +1% final grade and has a PVC at 101+78 and a PVT at 106+72
Is this flow laminar. What is the viscosity of the oil. For the same flow in the opposite directio, what manometer reading can be expected.
The size of the house is 28ftx40ftx10ft. For simplicity, assume the roof is flat, covered with 1-in plywood plus asbestos shingles and has 3 1/2 in of fiberglass insulation. There is a wood subfloor (25/32 in) in the attic and a ahrdwood floor (3/..
A 2 m high sandy fill material was placed loosely at a relative density of 47%. Laboratory studies indicated tht the maximum and minimum void ratios of the fill material are 0.92 and 0.53, respectively.
Assume a time to peak of 15 minutes and the unit peak discharge is 7.0 cfs/in, using the Gamma Function Unit Hydrograph what is the unit discharge at 20 minutes
A substance for which k is a constant undergoes an isothermal, mechanically reversible process from initial state(P1-->V1) to (P2-->V2), where V is a molar volume. a) Starting with the definition of k, show that the path of the process is described
given s=.30/(60-u), where s is the spacing (space headway) in miles, and u is the speed in miles per hour, derive the relationships u-k, u-q, and q-k. Also, estmate the capacity (qmax) of the roadway.
a wheel tractor scraper weighing 100 tons is being operated on a haul road which is now packed. this tractor is traveling fully loaded up a 6% slope to the dump site which is 0.5 miles away. the return trip is level and is also 0.5 miles away.
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