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An ocean outfall diffuser that discharges treated wastewater into the Pacific Ocean is 500m from a public beach. The wastewater contains 105 coliform bacteria per milliliter. The wastewater discharge flow rate is 0.3 m3/s. The coliform first order death rate in seawater is 0.3 1/h. The current carries the wastewater plume toward the beach at a rate of 0.5 m/s. The ocean current may be approximated as a pipe carrying 600m3/s of seawater. Determine the coliform concentration at the beach. Assume that the current behaves as a plug flow reactor and that the wastewater is completely mixed in the current at the discharge point.
Suppose the summer daily demand for water use in Phoenix is normally distributed with a mean of 310 million gallons/day and a standard deviation of 45 million gallons/day. Also suppose the city has reservoirs whose combined storage is 350 million ..
A body slides down a frictionless plane and during the third second after starting from rest if it travels 20.4m. What is the angle of inclination of the plane?
determine the preassure in psi at a depth of 20 ft below the free surface of a body of water and find the absolute pressure when the barometer reads 29.9 inches of mercury.
The owners wish to achieve an initial acceleration from rest of 22 ft/(sec^2) on a level paved surface. What is the minimum coefficient of road adhesion needed to achieve this acceleration
A driver traveling on a roadway decides to overtake a slow-moving truck traveling at 15 mph. The accelerating characteristic of the car is given by the following: dv/dt= 2.08-0.032v where v is the speed (ft/sec), and t is the time (sec).
You are a Project Manager on site where work for 3K.m. long Tunnel has been undertaken. The site is remote and takes about 2 days travel to nearest town. Supervisors, Technicians & Skilled Workers are engaged in dangerous / hazardous work.
An excavation is proposed for a site consisting of a homogenous, isotropic later of silt clay, 14.24 m thick, above a deep deposit of sand. The groundwater is 2m below ground level outside the excavation. The groundwater level inside the excavatio..
Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
An equal tangent vertical curve connects a -2% and a +3% grade. The low point of the curve is at elevation 297.88 ft. If the PVI is at elevation 295 ft, what is the design speed of the curve
A hydroelectric facility operates with an elevation difference of 50.0 m with a flow rate of 500 m3/sec. If the rotational speed is 90 rpm, determine the most suitable type of turbine and estimate the power output of the arrangement.
A 1.6-m wide rectangular channel carries 1.8 m3/s at a depth of 0.85 m. The channel undergoes a smooth transition in which the channel bottom rises 15 cm and contracts to a width of 1.3 m. Assuming friction losses are negligible, determine the dep..
Determine the bulk modulus of elasticity (in N/m^2) of a liquid that has a 1.10 percent volume decrease because of an increase in pressure from 1,000 N / cm^2 to 11,000 N / cm^2.
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