Normal Depth – Rectangular Channel This problem will require the use of Excel. For a rectangular channel, Slope = 0.0001, 15 ft bottom width: a refer to Table 5.1.1 in Chapter 5 of Mays and determine the normal depth for a discharge of 100 cfs using Manning’s roughness coefficients for Concrete (5.1.1, B-2c – pick 1), Channels not maintained with dense weeds (Ce1), Flood plains (D-2 – pick 1), and Major streams (D-3 – pick 1)—make sure you do not repeat roughness values. b Plot normal depth (y-axis) vs Manning’s roughness (x-axis) – label your x and y-axis c In a few sentences, explain what happens to normal depth as we change our Manning’s roughness. All normal depths range from 2 ft to 12 ft In Problem #2, you solved for the normal depths for a rectangular channel for four channel materials (concrete, dense weeds, flood plains, and major streams). Keep those depths handy— you will use the normal depths in part (b). h Solve for the critical depth (yc) of the rectangular channel (Slope = 0.0001, 15 ft bottom width) given the discharge is 100 cfs. As a reminder, these are the physical properties of the channel. FYI critical depth is not a function of the material properties so this yc is for all the channel materials listed. i Using Table 5.3.1, determine the relation of y to yn, and yc, designation, and type of flow for y = 1, 2, 3, 4, 5, 6, 7, 8 ft

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 20P

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Normal Depth – Rectangular Channel
This problem will require the use of Excel.
For a rectangular channel, Slope = 0.0001, 15 ft bottom width:
a refer to Table 5.1.1 in Chapter 5 of Mays and determine the normal depth for a discharge
of 100 cfs using Manning’s roughness coefficients for Concrete (5.1.1, B-2c – pick 1),
Channels not maintained with dense weeds (Ce1), Flood plains (D-2 – pick 1), and Major
streams (D-3 – pick 1)—make sure you do not repeat roughness values.
b Plot normal depth (y-axis) vs Manning’s roughness (x-axis) – label your x and y-axis
c In a few sentences, explain what happens to normal depth as we change our Manning’s
roughness.
All normal depths range from 2 ft to 12 ft
In Problem #2, you solved for the normal depths for a rectangular channel for four channel
materials (concrete, dense weeds, flood plains, and major streams). Keep those depths handy—
you will use the normal depths in part (b).
h Solve for the critical depth (yc) of the rectangular channel (Slope = 0.0001, 15 ft bottom
width) given the discharge is 100 cfs. As a reminder, these are the physical properties of
the channel. FYI critical depth is not a function of the material properties so this yc is for
all the channel materials listed.
i Using Table 5.3.1, determine the relation of y to yn, and yc, designation, and type of flow
for y = 1, 2, 3, 4, 5, 6, 7, 8 ft

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