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A big municipal utility district is considering two large-scale conduits. The first includes construction of a steel pipeline at a cost of $200 million. The pumping and other operating costs are expected to accrue to $6 million per year, increasing by 1% per year. Alternatively, a gravity flow canal can be constructed at a cost of $325 million. The O&M costs for the canal are expected to be $1million at EOY2, rising by $250,000 per year. Which conduit must be built at an interest rate of 6% if:
a) The projects are expected to last for 25 years?
b) The projects are expected to last forever?
A water tank has a height of 120m, and its area of cross-section is 2000m. Water is released from the tank and the water level drops by 1 meter every minute. Find the rate of change in volume.
The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3. a) What fraction of the herbicide is adsorbed, and what fraction is dissolve..
CE 3303 – Solids – MWF – Spring 2014 - Homework Set 23, – The pipe shaft of the auger, rotating at a constant angular velocity, is subject to the axial force and torque shown. Determine the stress state at points A & B and show on a stress element.
Air can be assumed as a di-atomic ideal gas. Find the final temperature and the amount of work ( in kW) required for air compression at a rate of 100 mol/s , from an initial condition of 1 bar an 25 C to 10 bar; for the following ways:
The horizontal motion of plunger and shaft is arrested by resistance of the attached disk which moves through the oil bath. If the velocity of plunger is v.
For energy conservation, materials with a high thermal capacity are effective in climates in which the heat flow through the building envelope is:
Toxic and Hazardous waste: how are they treated, safety measures, regulations in USA about hazardous waste.
Given an 18-in. concrete conduit with a roughness coefficient of n = 0.013, s = 0.02, and a discharge capacity of 15 cfs, what diameter pipe is required to triple the capacity?
Calculate the tensile modulus of elasticity for a 10 laminated composite consisting of 62 percent by volume of unidirectional carbon fibers and an epoxy matrix under isostress conditions.
Find the expanded depth of the bed after the backwash when initial depth of the bed is 3 ft using given conditions. μ = 0.01g/cm/sec, T = 25oC, ρs = 2.65, ρ=1, washrate = 1.5 cm/sec, ks2 = 196. (Assumed single size)
In year one, a pharmaceutical mixing tank had a market price of $120,000. It replaced an older smaller mixing tank that had a BV of $15,000.
Assuming unit surface area, find the conductive heat loss through the furnace wall and the temperature at the interface of the fire clay and red brick.
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