# CVG 3116 Lecture Notes - Lecture 9: Manning Formula, Memory Stick, Wetted Perimeter

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8 Feb 2016

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Thursday, November 5th 2015

CVG3116 - Hydraulics

Tutorial 5 – Solutions

1. In a rectangular channel, the bed width is equal to 4m and the discharge is 22.5

m3/s. The channel has two long parts with slopes S01=0.0004 and S02=0.009 and

Manning’s coefficients n1=0.015 and n2=0.012. Identify the type of water surface

profile along the channel.

Solution

I. Calculate the normal flow for both section of the channel

From Manning’s equation:

For section 1:

3.57m

For section 2:

0.95m

II. Find critical depth of the channel:

Thursday, November 5th 2015

CVG3116 - Hydraulics

III. Identify types of water surfaces:

For section 1:

For section 2:

2. Identify possible types of water surface profiles in the following cases. Note that

the control points are denoted.

a)

b)