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A sewage plant releases 250 m3/day of effluents containing 195 ppm of a chemical at the center of a wide, slowly meandering stream. The stream is 2.4 m deep and the bed slope is 0.00011.
a) Calculate the shear velocity.
b) Estimate the vertical and transverse mixing coefficients.
c) Assuming that the effluent is completely mixed over the vertical, determine the width of the plume and the maximum concentration 1200 m downstream of the discharge point.Assume uniform equilibrium flow conditions in the river and flow velocity v=1.1 m/s.
A 4m deep clay layer is underlain by impermeable shale. A sample of clay from the layer is subjected to an appropriate increment of stress in a consolidation test giving the following results:
A block with an inclination of 20 degrees has a weight of 60kg, a height of 1.8m and width 1m, static friction is 0.3, what is the force needed and the height (where the force in the box should be) to pish it upwards
A level is set up midway between two wood stakes that are about 300 feet apart. The rod reading on Stake A is 9.65 ft and the reading on stake B is 4.23 ft. The level is then set up 6 feet in front of stake B.
For an unknown alloy the stress at which plastic deformation begins is 400MPa and the modulus of elasticity is 120GPa. If the original specimen length is 76 mm
The moist unit weight of a soil is 19.kN/m^3. Given that specific gravity is 2.72 and water content is 10.6%, calculate dry unit weight, void ratio, porosity, and degree of saturation.
A four-wheel tractor whose operating weight is 47,877 lb is pulled up a road whose slope is +3.5% at a uniform speed. If the average tension in the towing cable is 4,860lb, what is the rolling resistance of the road?
A nearly horizontal, 12 ft wide rectangular channel carries 60 cfs at a depth of 3 ft. the width of the channel is smoothly contracted to 6 ft at the downstream section. (a) determine if the flow will choke and both the downstream and upstream water ..
A cantilever beam AB has a rectangular cross section and is loaded by a force P at an angle α that acts at the centroid of the cross section. Two strain gages are placed at point C, which is at mid-height of the beam. Gage D measures the strain in th..
A well mixed sewage lagoon is to be constructed to process 100000 gallons per day of raw sewage. The pollutant concentration in the raw seweage to be discharged into the lagoon is 200ppm. the organic matter in the sewage has been shown in a laborator..
The 81-lb uniform square plate is supported by a ball-and-socket joint at O, a cable at E, a fixture at A which can support vertical force only, and a linear spring at C. If the unstretched length of the spring is 4 in.
A contractor has installed a silt fence around an area that is semi-circular and level to prevent soil from the construction site entering nearby streams. The diameter of the semi-circle is 1000 feet.
If the maximum flow rate required is 20,000 kg/h, calculate the safe working pressure of the pipe. Take the pump efficiency as 70% and allow for a pressure drop of 0.5 bar across the control valve and a loss of 10 velocity heads across the orifice..
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