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A community had a population of 200,000 in 1995 and it is expected that this will increase to 260,000 by 2010. The water treatment capacity in 1995 was 165 ML/day. A survey showed that the average per capita water use rate was 700 L/(person.day). Estimate the community's water requirements in 2010 assuming
i) No change in use rate, and
ii) A reduced rate of 600 L/(person.day).
iii) Will expanded treatment facility be needed by 2010 for condition (i)? For condition (ii)?
A column has a mean capacity of 950 kip. The standard deviation for the column capacity is 50 kip. The average load is 700 kip with a standard deviation of 75 kip. What is the probability of failure, pf
A particular crest vertical curve has long been criticized as being unsafe. Its length is 400 ft. The prevailing speed on the crest vertical curve is 50 mph. In its present condition, its tangent grades are +2% and -3%.
If F_1=470N and theta=26 degrees, determine the magnitude of the resultant force of the three forces acting on ring A. Determine the direction of the resultant force measured counterclockwise from the positive x-axis.
In a certain community 36% of the families own a dog, and 22 percent of the families that own a dog also own a cat. In addition 30 percent of the families own a cat. a.) what percentage of families own both a dog and a cat
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.
Car B is driving straight toward the point O at a constant speed v. An observer, located at A, tracts the car with a radar gun. What is the speed |r(dot)B/A| that the observer at A records
The cycle has a thermal efficiency of 35%, and steam changes from saturated vapor at 300 C during the heat addition process. If the mass flow rate of the steam is 2kg/s, determine the net power (kw) output of this engine.
Effective stress is defined as the overburden soil pressure less the buoyancy effect of water. What is the effective stress 20 feet deep if the specific weight of the dry soil is 113 pcf and the water table is 11 feet deep
if the settling velocity of a particle is 2.80 mm/s and the overflow rate of an up flow clarifier is 0.560 cm/s, what percent of the particles are retained in the clarifier. If the flow rate of this problem is doubled
Given below are the measured stream flows in cfs from a storm of 6-hour duration on a stream having a drainage area of 185 mi^2. Derive the unit hydrogaph by the inverse procedure. Assume a constant base flow of 550cfs.
Compute the maximum service (unfactored) concentrated live load that can be applied at 1ft from the free end of the cantilever. Use load and strength -reduction factors from ACI Code Sections 9.2 and 9.3. Also check As,min.
Determine the minimum horizontal force P required to hold the crate from sliding down the plane. The crate has a mass of 70kg and the coefficient of static friction between the crate and the plane is μs = 0.45.
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