Unlined trapezoidal channel to be excavated in fine sand soil to
convey 350 ft3/s. The slope...
Unlined trapezoidal channel to be excavated in fine sand soil to
convey 350 ft3/s. The slope is 0.0025. Determine the width of the
bottom and the depth of water of the cross section of the channel b
and y.
Design a trapezoidal channel to pass a discharge of 10m3/s and the
channel will be excavated through rock by blasting. The topography
in the area is such that a bottom slope of 1 in 4000 will be
suitable. Assume that n = 0.030 and select a value for the side
slope, Z, as 1 horizontal to 4 verticals. Sketch the diagram for
all calculated dimensions.
A trapezoidal channel is to be designed through a silty clay
alluvium on a slope of 0.0035 ft/ft. The angle of repose of the
material is 35° and the Manning coefficient is 0.025. If the
channel is to be designed to carry a maximum discharge of 700 cfs
at a depth of 4.9 ft, determine if rip-rap will be required, and,
if so, compute the stone size for both the bed and sides.
3. a) A trapezoidal open channel is being
designed to convey a discharge of 11.0 m3/sec. The channel will be
excavated into clay and will have the following properties: side
slope of m = 1.5, the bottom slope of So = 0.001,
Manning’s n = 0.022, and bottom width b = 1.0 m. For these
conditions is there a risk of channel erosion?
b) The earth-works contractor that will carry out the excavation
suggests that the side slope angle can...
A trapezoidal channel has a bottom width of 3.25 m and sides
with a slope of 1 vertical
to 1.5 horizontal. The slope of the bed is 1 in 2000 and the
depth of water is 1.2 m.
a) Using the Manning Formula with n = 0.025, calculate the velocity
and
the discharge rate of the flow.
b) Calculate the Chezy number for the channel and use that to
re- calculate the velocity and the discharge rate of the flow....
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...
For a trapezoidal-shaped, concrete-finished gravel bottom
channel along a 0.5% slope, with a bottom width of 8 feet, a top
width of 32 feet, and side slopes of 4:1, calculate:
a. the channel’s full capacity discharge,
b. velocity at full capacity discharge, and
c. discharge and velocity when stream flow is 0.5 feet from the top
of the channel.
A
high water-table was encountered in low-fine content soil during
the excavation. This may endanger slope stability and result in an
accident. Suggest the most suitable groundwater control technique
to prevent this accident and explain its details
4. A trapezoidal channel of bedwidth6.0m,side slopes
are2:1,longitudinal bed slope=10cm/Km, Manning n = 0.025 and the
critical depth = 0.327 m. If the discharge is doubled, find the
corresponding normal water depth and critical slope
A 5 m wide rectangular channel carries a flow of 20
m3/s. The slope of the channel is 0.005 and the
Manning’s n is 0.03. The flow encounters a 0.5 m step up that is
0.1 m long. The depths far upstream and downstream are normal.
Classify this channel
Qualitatively sketch this scenario, label gradually varied flow
curves and provide appropriate depths.
Draw this scenario on an E-Y cycle graph, and label all depth
changes.
4 m3/s of water flows in a Rectangular channel with
base width 3 m, base slope J= 0.0016 and roughness coefficient K=
80.
a) find the normal depths and critical depth of the current.
B) determine the current regime.
roughhness coefficient given 80