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Calculate the surface area required for a stabilization pond to serve a domestic population of 1000. Assume 80 gpcd at 210 mg/l of BOD. Use a design loading of 20 lb of BOD/acre/day. If the average liquid depth is 4 ft, calculate the retention time of the wastewater based on influent flow. The effluent is spread on grassland by spray irrigation at a rate of 2.0 in/week (54,300 gal/acre/wk). Compute the land area required for land disposal. In these computations, assume no evaporation or seepage losses from the ponds.
An equal-tangent crest vertical curve connects a +3.2% and -1.1% grade. The PVI is at station 98+20. Due to drainage considerations, the highest point of the curve is at station 100+79.35.
In Singles badminton game, shuttle is smashed by Player A from close to base line, which is 6 m from the net. Height of the net to be cleared by a smash is 1.55 m. The shuttle is hit by player A at a speed of 250 km/h.
Assuming that the average stack gas velocity is 10.0m/s and the stack is circular with a 3.0 meter diameter, calculate the mass emissions rate of NO2 in kg/day.
Why is granular activated carbon(GAC) used to treat the industrial wastewater stream but not the domestic wastewater stream
when a force F acts on a linear spring, the elongation x of the spring is given by F=kx, where K is called the stiffness of the spring. Determine the dimension of K in terms of the base dimensions of an absolute system of units
The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x6 from x=-1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty the trough by pumping the water over the top.
A moist soil sample weighing 22.2 N has a moisture content of 20%. How man N of water must be added to the sample to increase the moisture content to 30%
Replace the given forces by a wrench and determine the coordinates of the intersection of its line of action (the coordinate of point P) with the plate. With a Force Fca=(100i+100j)N coming off of point C
After falling from rest from a height of 32 m, a 0.45 kg ball rebounds upward, reaching a height of 22 m. If the contact between ball and ground lasted 1.5 ms, what average force was exerted on the ball?
A pile group consist of four piles in cohesive soil. Each pile's diameter is 0.4 m, and center to center spacing is 1.2 m. The ultimate capacity of each pile is 300 kN. Estimate the design capacity of the pile group, using a factor of safety of 2
The mine's operating costs were projected at $900,000 per year including $400,000 of fixed costs and $500,000 of variable costs. Ms. Peru thought these forecasts accurate.
The volume of fill required is 2500 cubic meters. Find the volume of soil that must be excavated from the borrow pit to furnish the required volume of fill. (in cubic meters).
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