Font size
WorksheetsDay 53-Nov 14-worksheet-PWD-Open channel hydraulics & notches
Total questions: 15
Worksheet time: 12mins
In a wide rectangular channel, the hydraulic radius R is approximately equal to:
y/2
y
B/2
(B+2y)/A
The discharge over a sharp-crested rectangular weir without end contraction is proportional to:
H2
H3/2
H5/2
H
A triangular (V-notch) weir with angle 90 degrees gives Q proportional to:
H3/2
H2
H5/2
H
In a Pelton analogy for open-channel conveyance K at unit slope is
(a)
A broad-crested weir has maximum discharge when the depth over the crest h is:
H/2
2H/3
H/3
equal to upstream head H
“Rapidly Varied Flow (RVF)” best describes:
Steady, prismatic, gradual depth change
Abrupt depth/velocity change over short distance
Any laminar flow in channels
Flow at uniform depth only
In uniform open-channel flow, the energy slope, bed slope, and water surface slope are identical.
True
False
Mark True or False: End contraction in a rectangular weir increases the effective length of crest and hence increases discharge.
True
False
The hydraulic depth D is defined as ____ divided by ____ .
(a)
For a right-angled V-notch, tan(θ/2) = (a)
The notch is bigger in size than wier.Is this statement true?
(a)
Rectangular weir, suppressed (no end contraction): L=1.20m , Cd=0.62 , H=0.18m . Take g=9.81m/s2 . Compute discharge Q (in m3/s ).
(a)
For a Right-angled V-notch: Cd = 0.6 , θ= 90∘ , H = 0.1 m. Compute Q (m^3/s). Use g = 9.81 m/s^2.
(a)
Chezy uniform flow: C = 55 , R = 0.6 m, S = 0.0016 . Find V (m/s) using .
(a)
Cipoletti weir is type of trapezoidal weir in which the sides have a slope of…….
(a)
