CIV E 530- OPEN CHANNEL HYDRAULICS
SPRING 2005
FIRST MIDTERM
FEBRUARY 28, 2005, 1600-1715

Name: ______________________ S.S. No. _____________ Grade: _______

Instructions: Closed book, closed notes. Use engineering paper. When you are finished, staple your work in sequence (1 to 3), and return this sheet with your work.


  1. (25%) Calculate the critical depth for a rectangular channel where Q = 5 m3/s, and b = 5 m.

  2. Given the following data measured in a cross section in an open channel, calculate the velocity distribution coefficients α and β.

    Element Flow
    velocity
    (m/s)    		 Incremental
    flow area
    (m2)
    1 2.5 11.
    2 2.2 16.
    3 1.7 18.
    4 1.3 23.
    5 0.9 20.
    6 0.6 11.

  3. (50%) Please answer the following questions in a brief statement.

    • What is the Vedernikov number?

    • When is it necessary to use unsteady flow as opposed to steady flow when calculating floods?

    • Is HEC-RAS 3.0 steady or unsteady?

    • What is the main difference between a kinematic shock and a tidal bore?

    • What is the maximum value of Froude number that can be achieved in practice?

    • Why is the design of a spillway performed with empirical formulas?

    • What are the four forces present in open-channel hydraulics?

    • What is the exponent of the rating for turbulent Manning friction in hydraulically wide channels?

    • What is a control in open-channel hydraulics? How many types of control are there? What are there?

    • What is the minimum value of Manning's n that can be achieved in practice?