Situation: The town of Waterville has the following past population data projected beyond 1990.

Year                 1900    1910    1920    1930    1940    1950    1960    1970    1980    1990   

Population       10,240 12,150 18,430 26210 22,480 32.410 45,050 57,200 64,030 77,320

The average water consumption (including every possible sector) is 160 gal/cap-day in 2005. The town has a wastewater treatment plant (WWTP) with a treatment capacity of 20 MGD. Due to the rapid growth of the population, the town is planning to build a new WWTP assuming that the old WWTP will not be used any more after the new WWTP is operating.

Requirements: You are hired by the town as an engineer to do the planning. You need to (1) estimate the future populations using any reasonable method; (2) estimate the future wastewater generation rate (e.g., in the units of gal/cap-day); (3) estimate the initial year and design year of the new WWTP; (4) the average, maximum, and minimum daily and hourly flow rates for the initial and design year under both dry and wet weather conditions; (5) assume that the wastewater generated by the town is of medium strength, estimate the BOD₅, COD, SS, VSS, TKN, Total P, and alkalinity (as CaCO₃) in the raw wastewater to be treated by the new treatment plan.

Q11.a. Calculate the cost of a foundation with length x width x thickness dimensions of 1000 x 1200 x 600 mm. Concrete of ratios 1:4:8 will be made and mixed at site with a mixer machine. Assume the following: [8.5]
• The manpower service rate for casting the concrete OMR 13 / cubic meter.
• The formwork rate is OMR 5 OMR / square meter.
• The diesel consumption for the mixer machine is 3 liters / hour.
• The diesel machine needs to work for 4 hours to mix concrete for one foundation.
• The average price of diesel is OMR 0.277 / liter.
• The share of the rent of the mixer machine is OMR 6.500 for one foundation.
• Steel is to be excluded from this calculation.
• Prices for the raw materials are as follows:
o Cement: OMR 1.700 / bag
o Sand: OMR 15 / cubic meter
o Aggregate: OMR 18 / cubic meter

Explain the modes of failure with different factors influencing the decrease in shear strength of slope. Draw neat sketches wherever necessary.

You are assigned to select pipes for delivering water to a newly developed residential community (Class of Construction: 4). The community has 1000 houses; each household has 4 residents on average. For domestic water usage, a high demand of 0.40 m3 per person per day can be used for the design. The net fire flow (NFF) for this new community is estimated to be 2000 m3 /d. According to the design guidelines of the local water district, the maximum flow velocity should not exceed 2.4 m/s. The pipe should have a wall thickness of at least 0.6 inch. Using the NPS standard (see attachment), what will you recommend for the smallest pipe size acceptable for this project? 1 meter = 39.37 inches.

what are 3 sources of errors during land survying other than natural, personal and instrumental (not types) ?

(i) Explain the physical meaning of Reynolds number and Froude number.

A weir is an obstruction in a channel flow which can be calibrated to measure the flow rate. The flow discharge Q varies with gravity acceleration g, weir width b into the paper, and upstream water height H above the weir crest. If it is known that Q is proportional to b, use the pi theorem to find a unique functional relationship Q(g, b, H).

The county fire department is considering two options (A and B) for upgrading its aging physical facility. Assume an interest rate of 6% per year and 50-year time period.

Option A: Involves remodeling the existing fire station by spending $2,252,000 now. In addition, the cost for personnel and equipment will be $126,000 per year.

Option B: Calls for buying 5 acres of land for building a new fire station. The cost of the land in that area is estimated to be $366,000 per acre. The size of the new fire station would be 9,000 square feet with a construction cost of $151.18 per square foot. Contractor fees are expected to be $421,500(Assume all of the costs for plan B occur at time 0). In addition, the sale of the old site is to anticipated to net a positive $500,000 five years in the future from today.

Q1: Determine the Present Worth of Plan A and Pan B.

Q2: Which plan is better on the basis of present worth analysis?

28. An isosceles triangle with a base of 5.5 m, height 7.3 m, dipped upright in oil with a relative density of 0.800 with horizontal axis of symmetry. If the tip of the horizontal axis is 4m, determine the Total force on one side of the triangle! and put the center of pressure vertically!

[ Answers : 625 kN, 4.28 m ]

29. How far is an upright square, if its side is 1.2 m with two horizontal sides, dipped under the surface of the water so that the center of the pressure is 75 mm below the center of weight? What is the final total force on the square?

[ Answers : 1m, 23700 N ]

I'm sorry there's no Figure in this questions.