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.

Consider a wall with the following dimensions: 120 feet long x 15 feet high x 9 inches thick. Also consider using a concrete pump with a capacity of 800 cubic feet per hour. Concrete mix consists of Type 1 concrete with retarder, and a unit weigh of 155 pcf. The maximum pressure applied on the wall form is approximately 2,200 psf.

What is the rate of pour?

What is the maximum temperature at which the concrete can be poured? Clearly label the units of temperature, and state all justifications for selecting equations, and coefficients accordingly.

What all factors an engineer must consider for designing a retaining wall to retain a soil of height 10m? How those factors are different for a cohesionless soil, a cohesive soil and a saturated soil?

A vertical curve has its PVI at station 14+75.00 and elevation 76.29 ft. The grade of the back tangent is 3.4%, the grade of the forward tangent is -4.8%, and the curve length is 450 ft.

1. Determine the stations and elevations of the BVC and EVC.
2. Determine the location and elevation of the high point of the curve.
3. Determine the curve elevation at station 14+00 and station 16+00.

Q4: Experiments were conducted to determine the safe buckling load on columns with T-section
100 mm × 100 mm × 10 mm with different support conditions. When both ends of the columns
are fixed, safe crippling load carried by the column was found to be 60 × 103 N. Suggest the
length for other three columns for the same crippling load when the support conditions are
changed to one end fixed but the other end free, both the ends hinged and one end fixed but the
other end hinged. The cross section of the column is kept constant in all cases, and E = 200 GPa.
Take factor of safety = 4.
Instead of T section, a hollow column of same material having length 5 m and external diameter of
55 mm when subjected to a compressive load of 60 kN, there was a shortening in the length of the
column by 0.120 cm. Suggest a suitable value for the thickness of the column to withstand the safe
crippling load when one end of the column is fixed and other end is free? (8 m

3-lane freeway reduces to 2 lanes

total flow in section = 5000 veh/hr

lane saturation flow rate= 2400 veh/hr

traffic density at A: 10veh/km/ln

shockwabe speed Wab between A nad B = -10km/hr

Find traffic density at B (immediately upstream of the lane reduction) and the stream flows at locations A (far upstream from lane reduction), B, and C (within the lane reduction)

A six-lane freeway with three lanes in each direction is on a level terrain and has 11-ft

lanes with a 4-ft right-side shoulder. The total ramp density is 2 ramps per mile. The

directional peak-hour traffic volume is 5400 vehicles with a peak-hour factor of 0.95 and

all familiar users. The traffic stream includes 5% trucks and another 5% buses and no

recreational vehicles. The city has decided to ban all heavy vehicles from using the

freeway during the peak hour. Compute the level of service before and after the heavy

vehicle ban.

Briefly describe the meaning of the following glulam designations:

a. Stress Class 20F-1.5E
b. Stress Class 24F-1.8E
c. Stress Class 30F-2.1E SP

d. Combination 20F-V7 DF/DF

e. Combination 24F-V5 DF/HF

f. Combination 24F-E11 HF/HF

g. Combination 26F-V2 SP/SP

h. Combination 5 DF

i. Combination 16 HF j. Combination 48 SP