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The country town with service area of 150 ha is sewered, and the main outfall sewer is laid on a grade (slope) of 0.003 m/m to a treatment plant. Effluent from the treatment plant is at present discharged via an open channel to the river. At the end of the design period (20 years), wastewater from a proposed dairy industry (average wastewater flow of 0.5 ML/day, BOD5 = 1500 mg/L, and service area = 25 ha) and from a nearby food processing industry (average wastewater flow of 300 m3/day, BOD5 load of 68 kg/day, and service area = 25 ha.) are also expected to be discharged into the main outfall sewer. Assume that the average wastewater contribution from the community is about 300 L/(person. day) and each person contributes 70 g BOD5/day.
(a) Estimate the ultimate mean dry weather flow, peak dry weather flow, peak wet weather flow and the minimum dry weather flow.
(b) Calculate total organic load reaching the plant per day and the population equivalent based on BOD5 of the combined wastewater flow for ultimate development condition (ie. end of the design period).
(c) Determine the pipe size required at the ultimate development stage for the main outfall sewer.
With the recent trend towards obesity, the manufacturer wants to change the length (but not the cross-section) so that the 6" deflection occurs when a 200 pound person stands on the end.
A natural channel that is clean and irregular(n= 0.040) has a bottom width of 15 ft m, side slopes of 6:1 (H:V) and a bottom slope of 0.0002. Using Manning's equation, determine the normal depth in the channel for a discharge of 720 cfs.
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A 6.6 mA current is flowing through a 47 kilo-Ohm, 5% tolerance, 2-watt resistor. If the resistor values are uniformly distributed, how many resistors out of a package of 100 would you expect to burn up
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Estimate the maximum number of cars per hour that can travel down two lanes of a highway as a function of speed (ie at 50, 60 , and 70 mph) .for safety purposes the cars must be spaced one car length apart for each 10 mph they are traveling.
For each of the following transitions, draw E2,y2 on the specific energy chart and fully describe the reasoning. a. In a rectangular channel, there is a sudden drop in the channel bottom. Did the water depth increase or decrease
if a source of groundwater gets contaminated with a DNAPL and another one gets contaminated with a LNAPL, which one will be harder to remediate and why
A fireman reduces the exit area on a nozzle so that the velocity inside the hose is quite small relative to the exiting velocity. What is the maximum exiting velocity and what is the maximum height
Determine the mass of the earth knowing that the mean radius of the moons orbit about the earth is 238.910mi and that the moon requires 27.32 days to complete one full revolution about the earth
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