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A community has a current population of 15,000. 10 years ago, the population was 12,500 and the community has a declining growth rate with a saturation population of 22,000. The total water consumption for the community at present is 2.25 million gallons per day. The treatment plant has a capacity of 0.3 million gallons per day. Determine how many years from now the consumption will reach 85% of its design capacity if current water usage rates remain steady
A solid steel sphere with a specific gravity of 7.85 and diameter of 0.02 m is falling at its terminal velocity through water at 25 °C. Using either trial-and-error or a graphical approach, determine the velocity of the sphere
The elevation of the curve at its deepest point must be at elevation 168.00 feet or higher to clear a major pipe installation. If the PVC is at station 0+00 with an elevation of 176.20 feet, determine the location of the deepest point of the curve..
Compare the reactor volume required to achieve 95% efficiency for Completely Mixed Flow Reactor (CMFR) and a Plug Flow Reactor (PFR) for the following conditions. steady-state, first-order reaction, flow rate = 14m3 / day.
Hypothetically, upon leaving the filling station, tire pressure for each tire on the 18-wheeler was measured as 105 psi (gauge), and the wheel contact area with the ground was a 6.0 in by 7.0 in rectangle.
A thick steel sheet of area 440cm3 is exposed to air near the ocean. After a one-year period it was found to experience a weight loss of 880g due to corrosion. To what rate of corrosion in mm/yr dose this correspond
The vertical effective stress at a certain point in a loose sand is 1000lb/ft^2. If an earth quake were to occur, how much excess pore water pressure would need to develop at this point for liquefaction to occur
A loose uniform sand with rounded grains has effective grain size of 0.05 cm. What will be the Coefficient of permeablity of sand
Water in a household plumbing system originates at the neighborhood water main where the pressure is 480kPa, the velocity is 5m/s, and the elevation is 2.44 m. A 19 mm (3/4-in) copper service line supplies water to a two-story residence
Two identical complete-mix activated sludge units are connected in series; one-half of the sludge recycle flow rate, QR, is recycled to the primary effluent pipeline which handles a flow rate Q, and the other half is recycled to the effluent line fro..
A W14x34 section is used as a simply supported beam over a span of 20 ft. The beam is loaded with a concentrated live load of 10 kips at the center of its span, in addition to its own weight.
A cyclist rides up a local mountain at an average speed of 11 mph. The road has an average grade of 5.5%. The cyclist and her bike have a combined mass of 75 kg. The force from road drag is 2.5 N and the aerodynamic drag (in Newtons)
The point of intersection of the centerline of Elm Road with the centerline of first Street was originally recorded (using a 30-m steel tape) as being at 6 + 71.225. How far from existing sation mark 5 + 00 on first street would a surveyor have to
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