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A manually cleaned bar screen has bars with a thickness of 8-mm (0.31-in) and openings 25-mm (0.98-in). After operating for a period of time, assume that the opening size decreases to 10-mm due to the accumulation of materials (debris) on the screens. If the approach velocity is 0.68 m/s (2.3 ft/s), determine if the screen needs to be cleaned. Why or why not?
An activated sludge aeration tank has a width of 14m, a length of 15m and an effective liquid depth of 4.5m. The secondary clarifier has a diameter of 25m. The plant operating parameters are as follows
All but 5 of the 60 years experienced one or more 30-min intensities equaling or exceeding the 2.5 in/hr value. Use the Kimball formula to determine the return period of this intensity using
What relationship between Atterberg limits and cohesion for Shear test
what policies were implemented during and after WW1,WW2,Cold war?
A first order reaction is employed in a destruction kind of a certain kind of microorganism. ozone is used as the disinfectant and the reaction is found to be dC/dt=-kC. where C is the concentration of microorganisms, microbes/ml. K is the rate const..
A copper wire breaks under an engineering stress of 43x10^3 psi. Its ductility is 77%it reduction area. Calculate the true stress (in psi) for fracture in the neck region.
This uniformly reduces 4X10-4 cm / s to a depth of 22 meters. If the water level is about 3 feet below the surface, determine the saturated hydraulic conductivity of the layer.
Determine the compressive strengths of the following: A) A 6-in. diameter concrete cylinder that failed at ta test load of 135,000 B) A-3-in. diameter specimen that failed at a test load of 30,000
determine the elongation of the cable due to its own weight. B. show thet the same elongation would be obtained if the cable were horizontal and if a force equal to half of its weight were applied at each end
determine the force in member AC, FH, and FG and indicate if the member is in tension or compression. List all zero force members.
A marble is drawn at random from a box containing 10 red, 30 white, 20 blue, and 15 orange marbles. Find the probability that is: (a) orange or red (b) not red or blue (c) not blue (d) white (e) red, white, or blue
a vertical curve is formed when a rural highway passes under a bridge joining a -8 grade to the horizontal grade
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