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CE 4353 Design of Hydraulic Systems
CE 5360 Open Channel Flow
Fall 2023 Exercise Set 2

LAST NAME, FIRST NAME

R00000000

Purpose :

Apply principles of specific energy in rectangular open channels; apply definition of choked flow

Assessment Criteria :

Completion, results plausible, format correct, calculations (Jupyter Notebook) are shown.

Instructions :

  • CE 4353 Complete Problems 1-2
  • CE 5360 Complete All Problems

Problem 1

Water is flowing at a depth of 10 $ft$ with a velocity of 10 $\frac{ft}{sec}$ in a rectangular channel. A smooth upward step in the channel bottom of 1 $ft$ is proposed

Determine:

  • The flow depth (on the step).
  • The change in water surface elevation.
  • The maximum allowable step height that prevents choking (assume a head loss coefficient of 0).
In [6]:
# sketch(s) 
# list known quantities
# list unknown quantities
# governing principles
# solution details (e.g. step-by-step computations)
# discussion

Problem 2

Water is flowing at a depth of 10 $ft$ with a velocity of 10 $\frac{ft}{sec}$ in a rectangular channel. A smooth contraction in width from 10 $ft$ to 9 $ft$ on a horizontal bottom is proposed

Determine:

  • The flow depth (in the contracted section).
  • The change in water surface elevation.
  • The maximum allowable contraction width that prevents choking (assume a head loss coefficient of 0).
In [6]:
# sketch(s) 
# list known quantities
# list unknown quantities
# governing principles
# solution details (e.g. step-by-step computations)
# discussion

EZ Button Link to ES-2 sample solution

Problem 3 (CE 5360)

Download and read Granata, Francesco & Gargano, Rudy & DE MARINIS, Giovanni & Hager, W. (2010). CHOKING FEATURES OF DROP MANHOLES IN SEWER SYSTEMS, 1st European IAHR Congress. Edinburgh, UK.

Answer the following questions using complete sentences. You do not need to write equations or draw figures to answer the questions. Short paragraphs should be sufficient to answer the questions. You may copy the text of the questions into your own document. Use 1.5 line spacing to make it easy to read.

  1. State the apparent objective(s) of the article.
  2. Explain the effect of downstream pipe slope on flow choking.
  3. Explain the meaning of the approach flow filling ratio $y_0$.
  4. Explain the meaning of the choking inception parameter $\psi$.
  5. Describe the significance and utility of these two parameters in drop manholes.
  6. Explain why sewers would be a concern in an open channel flow context.