A trapezoidal channel carrying 280 cfs has a bottom width of 12 ft, side slope of 2 and a longitudinal bottom slope of 0.001. The critical depth is 2.25 ft and the normal depth is 2.78. The flow depth at the downstream end of this channel is 3.12 ft. Determine which of the statements below is correct.
Select one:
a.
The flow depth decreases in the flow direction.
b.
None of the above.
c.
A flow depth of 2.55 ft will not occur in this channel.
d.
If the channel is very long, a hydraulic jump will occur.
In: Civil Engineering
Explain how the 4 main components of cement (C3S, C2S, C3A and C4AF) each participate in the hydration process and contribute to the properties of hydrated cement/concrete.
In: Civil Engineering
A retaining wall x m high was designed to stabilize a horizontal ground surface. The back
of the wall is inclined 15 o to vertical direction and can be assumed rough with interface frictionangleofxo.Thesoilparametersareφ' =33o ,γ =18kN/m3,γ =20kN/m3.
Assume no seepage effects.
(a) Draw a diagram to show the given wall dimensions, relevant inclinations and the direction of the active force on the wall.
(b) Calculate lateral force on the wall assuming the ground water table is at the base of the wall.
(c) After a flood, the ground water table rises 0.5m above the wall top surface. Calculate the lateral force on the wall after the flood.
(d) If the weight of the wall is (500+ x) kN/m, is the wall safe against sliding after flooding event? Please show your calculations. . the value of x is 28
In: Civil Engineering
1. Bearing capacity of strip foundation is independent of water table location (True/False)
2. Density of sand significantly affects the bearing capacity factor Nq (True/False)
3. The bearing capacity of square footing (Length x Width = 39 x 39
m) is higher than strip footing (Width 39 m) under similar
conditions (True/False)
4. Bending moment of 39 kNm increases the ultimate bearing capacity
of strip footing having a width of 39 m (True/False)
5. Shape factors for square footing with inclined loading should
always be set to 1.0 (True/False)
In: Civil Engineering
In: Civil Engineering
1. Which of the following statement is correct?
(a) The maximum stable slope in a coarse-grained soil (φ’=
39o, in the
absence of seepage, is half of 39o
(b) Taylor’s method can be used to assess short term slope
stability
(c) A saturated tension crack in the ground can stabilize
slope
(d) The maximum stable slope in a coarse-grained soil (φ’=
39o), in the presence of seepage, is 2 times of
39o
2. Which below situation provides the largest bearing capacity
for soil under a square footing (width 39m) placed 1m deep into the
ground?
(a) When the water table is at the ground surface
(b) When the water table is at the base of the footing
(c) When the water table is at (1+ 39) depth from the ground
surface
(d) When the water table is 39 above the ground surface
3. Which of the following statement is correct for a strip
foundation (Length 39 m) placed on the ground surface?
(a) Shape factor is 1.0+ 39
(b) Depth factor is < 1.0
(c) Shape factor is 1.2
(d) Shape factor is 1.0
In: Civil Engineering
What principles guided President Hoover’s response to the Great Depression, and how did this restrict his ability to help the American people?
Answer in 2 paragraphs.
In: Civil Engineering
A simply supported reinforced concrete beam with uniformly distributed load of 10 kN/m has a span of 6.0 metres. The beam cross-section is 225 mm breadth by 300 mm depth. Sketch and design the beam. Make necessary and realistic assumptions where applicable
In: Civil Engineering
The flow hydrograph ordinates observed in a basin with a
precipitation area of 500 km2 for a
3-hour showers are given in the table below. Assuming the base flow
is constant and 10
m3/h;
a) Calculate the total volume of flow as m3, which consists of
precipitation.
b) Calculate excess rainfall height and duration.
c) Determine the unit hydrograph which is equal to the
precipitation period of excess
rainfall.
(time is given a hour 10m3/h ) not false..
Time (h) | 0 | 1 | 2 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 |
Discharge (m3/s) | 10 | 10 | 10 | 110 | 180 | 150 | 130 | 112 | 96 | 82 | 70 | 60 | 52 |
Rainfall (cm) | 0 | 1 | 3.5 | 4.5 | |||||||||
Time (h) | 33 | 36 | 39 | 42 | 45 | 48 | 51 | 54 | 57 | 60 | 63 | 66 | |
Discharge (m3/s) | 44 | 37 | 32 | 28 | 24 | 22 | 19 | 17 | 15 | 13 | 12 | 10 |
In: Civil Engineering
The distance and depth values measured in various slices in a
stream section and the measurement times and rotation numbers in a
muline with coefficients a = 0.15 and b= 0.08 are given
below.
a. Calculate the area, average velocity, and flow rate of each
slice as well as the total area and average velocity of the entire
cross section.
b. When measuring with another muline, it was measured as n = 22
when V = 1.94 m/s and n = 28 when V = 2.14 m/s. Determine
coefficients of muline and equation of velocity. In a measurement
made with this muline, calculate the flow rate according to making
35 rotations to the muline in 55 seconds.
Slice No | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
x (m) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
h (m) | 0.0 | 0.30 | 0.60 | 0.70 | 0.65 | 0.40 | 0.25 | 0.15 | 0.0 |
t (s) | 120 | 120 | 120 | 150 | 120 | 60 | 120 | 90 | |
d | 20 | 26 | 32 | 45 | 28 | 17 | 20 | 12 | |
--- | --- | 26 | 35 | 24 | --- | --- | --- |
In: Civil Engineering
A venturi flume is 1.3m wide at the entrance and 0.65m in the throat. Neglecting Hydraulic losses in the flume, calculate
The hump of 20cm is now installed at the throat so that a standing wave
In: Civil Engineering
write short conclusion and recommendation about HOW ENERGY CONSERVATION MEASURES CAN BE USED FOR LIGHTING CONTROLS
(please type the answer)
In: Civil Engineering
A stainless steel pencil case was ran over. There is a concern
that the case may have cracks that are not apparent to the naked
eye. How could someone check to see if the case is indeed cracked?
Describe how the test would be carried
out.
In: Civil Engineering
In: Civil Engineering
A nonslender square corner column is subjected to biaxial bending about its x and y axises. It suppoerts a factored load Pu= 300,000 lbs acting at eccentricities ex=ey= 7 in. Design the column size and reinforcement needed to resist the applied stresses. Given: f'c = 4000 psi fy = 60,000 psi. d'=2.5 in. Gross reinforcement percentage, px=0.03. Solve by using all three methods.
Please show all work and explain your steps, please.
In: Civil Engineering