Question

In a trapezoidal channel with a constant width of b=3 m. and side slopes of 1:3 (1 vertical, 3 horizontal) and discharge rate of 6 m3 /sec, if the maximum step upward height is z=0.5 m. not to cause any choking, what is the water depth before and after this maximum step upward. Draw the water surface profile and specific energy curve (E vs y) for this flow.

Answer #1

A concrete, trapezoidal channel with a 5-m bottom width and side
slopes of 1:1 (H:V) discharges 35 m3/sec. The bottom slope of the
channel is 0.004. A dam is placed across the channel and raises the
water level to a depth of 3.4 m. determine the channel and flow
classification (e.g., M-2, S-1) upstream of the dam and explain
your supporting logic. then compute the water surface profile at
50-m intervals until you reach the hydraulic jump. Use a
spreadsheet...

A trapezoidal channel has a bottom width of 5 m and side slopes
m = 2. If the flow rate is 20 m3/s, what is critical depth?

3. A trapezoidal channel has a base width b = 8 ft and side
slopes 6H:1V. The frictional slope is Sf = 0.035 and the Manning
roughness coefficient is n = 0.014. Design a channel if channel
discharge is = 15.45 m3 /s using Mannings
equation. The farmer land is 3.482 acre with a
length of 951.43 ft. what is the best length for the grass
waterway?
Depth of channel, d=? (5).
Top width of the channel=? (3)
Freeboard of...

The discharge in a channel with bottom width 3 m is 12 m3 s–1.
If Manning’s n is 0.013 m-1/3 s and the streamwise slope is 1 in
200, find the normal depth if:
(a) the channel has vertical sides (i.e. rectangular
channel);
(b) the channel is trapezoidal with side slopes 2H:1V.
(Answer with steps plz)

A trapezoidal concrete channel (n = 0.015) has side slopes of
2H:1V, a bottom width of 10.0 ft, and a longitudinal slope of
0.005.
(a) Compute the discharge rate (in cfs) and velocity (ft/s) when
the water depth is 3.0 ft.
(b) Compute normal depth and critical depth (in feet) for a
discharge rate of 300 cfs.

A discharge of 4.25 m3 /s occurs within a trapezoidal channel
with a base width of 3m, 3:1 side slopes (i.e. Z = 3), a
longitudinal bed slope of 0.0009 m/m with a Manning’s roughness
coefficient of 0.025 (i.e. sand). State the normal flow depth (yn)
critical flow depth (yc) and the Froude Number of the flowing
water.

EXAMPLE 6.1 A trapezoidal irrigation canal has a bottom width of
b¼1.2m, side slopes of m¼2 (2H:1V), and a longitudinal bottom slope
of S0¼0.0005. A rectangular sharp-crested weir placed in this
channel has a crest height of p¼0.70m, and a crest length of
Lw¼0.80m. The water surface elevation at the approach section is
h0¼0.77m above the weir crest. Determine the discharge in the
canal.

A hydraulic jump is formed in a trapezoidal channel of 2.0-m bed
width, 1:1 side slope, and carrying a discharge of 6.0 m3/s. The
initial and final depths of the jump are 0.5m and 2.0m,
respectively. Concrete blocks are placed to stabilize the jump. Cf
= 0.6. Construct the M-y diagram for the channel section. Find the
critical depth.

A trapezoidal channel is 6 m wide and has a side slope of 0.5
horizontal: 1 vertical. If the
bed slope of the channel is 0.0004 and Manning’s n = 0.02,
find the discharge which can
make the channel a hydraulically efficient channel
section.

Consider the California aqueduct, which is a concrete
trapezoidal channel with a bottom width of 40 ft, a longitudinal
slope of 0.004% and 1.5H:1V sideslopes (z = 1.5). Assume n =
0.013.
The design discharge is 6400 mgd. (use 9900 cfs)
The depth of water is 29 ft at point A.
The depth of water is 30 ft at point B.
(a) What is the normal depth?
b) Determine the critical depth.
(c) What type of profile exists in the...

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