CIV E 530- OPEN CHANNEL HYDRAULICS
FALL 2003
FIRST MIDTERM
OCTOBER 6, 2003, 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. (35%) Using the specific energy principle, calculate the discharge (in m2s-1) through a sluice gate in a wide rectangular channel, with upstream depth y1 = 0.5 m, and y2 = 0.1 m.  

     

     

     

     

     

  2. (35%) An obstruction at the bottom of a wide rectangular channel extends through its width and causes the downstream flow depth to be 90 percent of the upstream flow depth. The steady flow is 1 m2s-1 and the upstream flow velocity is 1.2 m s-1. Calculate the force in kN m-1 exerted by the obstruction on the flow.

     

     

     

     

     

  3. (30%) Please answer the following questions in a brief statement.

    (a) What is the Froude number?
    (b) What is the Vedernikov number?
    (c) What is a rating in open-channel hydraulics?
    (d) What are the four forces present in open-channel hydraulics?
    (e) What is the minimum value of Manning's n that can be achieved in practice?
    (f) Why is unsteady uniform flow impossible in nature?