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A 12.0 m rectangular channel, having a bed slope of 50 cm/km and a Manning roughness coefficient of 0.015, conveys water at a normal depth of 1.0 m. A dam is built across the channel at which the wa
Two remediation options are being considered for a contaminated land area formerly used for industrial operations. Option 1 involves removing all of the contaminated soil over a two-year period at a
An emission control system for a new car costs $800 and reduces NO_x emissions from 0.4 g/mile to 0.23 g/mile. Assume the car is driven 10000 miles per year, and the life of the emissions control sy
The wastewater influent has a linear velocity of 0.5m/s and contains 3.0x10^5 fecal coliform colony unit (CFU) per liter. Determine the coliform concentration of the discharge effluent into Back riv
A well mixed sewage lagoon is to be constructed to process 100,000 gallons per day of raw sewage. The pollutant concentration in the raw sewage to be discharged into the lagoon is 200ppm.
The inlet gas velocity is 16m/s and the particle density is 1.6 gm/cc. The working temperature of the process is 400K. Estimate the particle size that will be collected with 50 percent collection ef
Suppose in 100 years energy consumption is still 330 Ej/yr, but coal supplies only 20 percent of total demand, natural gas supplies 30 percent, and oil 10 percent. The remaining 40 percent of demand
HZ Wireless must rebuild a cell tower recently destroyed by a tornado. A tower made of normal steel (NS) will cost $30,000 to construct and should last 15 years. Maintenance will cost $1000 per year
When a channel of triangular cross section was new, a flowrate of Q caused the water to reach L = 2 m up the side of the channel. After considerable use, the walls of the channel became rougher and
The rectangular beam is 18 ft long and subjected to a uniformly distributed dead load of 1.5 kip/ft (not including the beam weight), a live load of 1.5 kip/ft, and a load of 2 kip/ft by earthquake e
Drawdown at an observation well 15m from the pumped well is 3.0 m and a drawdown at a second observation well 150 m away is 0.30 m. Find the hydraulic conductivity of the aquifer.
a 50cm^3 sample of dry soil from an aquifer weighs 100g. when it is poured into a graduated cylinder, it displaces 35cm^3 of water. What is the porosity of the soil. What is the average density of t
During the following day the sun melts the ice cover. Determine the new depth if the flow rate remains the same and the surface roughness of the ice is essentially the same as that for the bottom an
If the flowrate is Q = 25 ft^3/s and the upstream depth is 2 ft, determine the downstream depth. Sketch the specific energy diagram and indicate its important characteristics. Note that the specific
The measurements of the nominal shear strength (in kN) for a sample of 15 prestressed concrete beams are as follows: 580 400 428 825 850 875 920 550 575 750 636 360 590 735 950
Benzene is a toxic chemical used in the manufacturing of mechanical chemicals. A manufacturer claims that its exit (effluent) water meets the federal regulation standards with a mean of less than 79
A lake has a steady-state pollution concentration of 50 mg/L and is being fed by a stream with flow rate 50m3/day. The volume of the lake is 1.00 x 10^7 m3, and the decay rate for the pollutant is 0
A 12-in well is drilled through a confined aquifer of average thickness 80 ft. Two observation wells located 50 and 120 ft away register a difference in drawdown of 10 ft. The steady-state pumping r
A well of 0.4 m diameter fully penetrates a 25 m thick confined aquifer of coefficient of permeability of 12m/day. The well is located in the center of a circular island of radius 1 km.
For a circular curve with a radius R of 400 meter, what is the degree of curve by (a) arc definition and (b) chord definition
For turbulent flow in a circular pipe find r/r0 at the radial distance from the centerline where the mean velocity occurs
For the loading sown, use double integration method to determine: the equation of the elastic curve for the cantilever beam, the deflection at the free end and the slope at the free end.
Benefits associated with a project are $10,000 forever starting in year 1. The costs are $20,000 in year 0 and $20,000 in year 3. What is the B/C ratio at i=12% per year. First determine present wor
A four- lane undivided multilane highway ( two lanes in each direction) has 11- ft lanes and 5- ft shoulders. At one point along the highway there is a 4% upgrade that is 0.62 mi long. There are 15
Given that the average power plant produces 667 MW of electricity per year, there are 492 coal plants in the US, and a solar constant of 1.361 KW/m^2, how large of an area would one need to cover wi