Department of Civil and Environmental Engineering
ENGRCEE 81B – Civil Engineering Practicum II, Winter 2024
MIDTERM
For each problem below, write down your calculationsand box your final answer.
1. (12 points) The length of course AB is 100 ft.
Calculate the following for course AB:
a) Bearing
b) Azimuth
c) Latitude
d) Departure
2. (6 points) Determine the elevation difference between points A and B:
Vertical angel: Θ = 3o33’ 33’’
Slope distance: L = 300ft
Rod reading: RR = 4.5ft
Height of instrument: HI = 5ft
Elevation at A: 500 ft
3. (9 points) Calculate the elevation at point C
hA = 4.5 ft
hFSB = 2.5 ft
hBSB = 5.5 ft
hc = 2 ft
Elevation at A: 1000 ft
4. (16 points) A field investigation was performed and yielded the following information:
A1 = 500 ft2
A2 = 1500 ft2
Am = 1000 ft2
The table below shows the cost per cubic yard
(CY) of earth cut and filled for the proposed project.
|
Excavate and Fill
|
Cost per Cubic yards
|
|
0-1000 CY
|
32.2 $
|
|
1000-20000 CY
|
18.52 $
|
|
>20000 CY
|
10.47 $
|
a) Calculate the total cut volume (in cubic yards) in this project. Specify the
method used to calculate the cut volume. (12 points)
b) Estimate the cost of the earthwork based on the total cut volume. (4 points)
5. (22 points) The interior angles in the closed traverse below were measured as follows:
θ1 = 23o4'10" , θ2 = 115o43'31" , and θ3 = 41o11'52" .
a) Compute the adjusted interior angles in this traverse. (18 points)
b) Name two methods for computing the area of a closed traverse. You do not need to calculate the area. (4 points)
6. (20 points) In the following diagram, the length of AB is 300 ft.
a) Compute the latitude of AB. (10 points)
b) Compute the departure of AB. (10 points)
7. (15 points) The course AB has following latitude and departure:
Lat: - 170.5 ft
Dep: - 185.2 ft
a) Compute the bearing of AB. (5 points)
b) Compute the azimuth of AB. (5 points)
c) Compute the length of AB. (5 points)