7. Use the manning's equation above to find the streamflow rate (Q) under the following conditions: a. Rectangular canal b. Asphalt, smooth (n) c. River top width (B) = 500 m d. River depth (Y) = 2 m e. River bed slope (S) = 0.03 m/m f. Conversion constant (k) = 1
7. Use the manning's equation above to find the streamflow rate (Q) under the following conditions: a. Rectangular canal b. Asphalt, smooth (n) c. River top width (B) = 500 m d. River depth (Y) = 2 m e. River bed slope (S) = 0.03 m/m f. Conversion constant (k) = 1
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:7. Use the manning's equation above to find the streamflow rate (Q) under the following
conditions:
a. Rectangular canal
b. Asphalt, smooth (n)
c. River top width (B) = 500 m
d. River depth (Y) = 2 m
e. River bed slope (S) = 0.03 m/m
f. Conversion constant (k) = 1

Transcribed Image Text:Manning's Equation
O=VA
==
k
R2/3
S
0
Values of Manning n
Cement plaster
Untreated gunite
n
Lined Canals
Wood, planed
Wood, unplaned
Concrete, trowled
Concrete, wood forms, unfinished
Rubble in cement
Asphalt, smooth
Asphalt, rough
Natural Channels
1/2
Gravel beds, straight
Gravel beds plus large boulders
Earth, straight, with some grass
Earth, winding, no vegetation
Earth, winding with vegetation
A
Chow, V. T. 1959. Open-Channel
Hydraulics. McGraw-Hill, Inc.
n
0.011
0.016
0.012
0.013
0.012
0.015
0.020
0.013
0.016
0.025
0.040
0.026
0.030
0.050
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