CE444-APPLIED HYDRAULICS
SPRING 2002
FIRST MIDTERM
FEBRUARY 26, 2001, 0930-1045

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

Instructions: Closed book, closed notes. Use engineering paper. When you are finished, staple your work in sequence (1 to 4), and return this sheet with your work.

  1. (20%) A watershed has two portions: (1) an undeveloped portion, of 35 ac and runoff coefficient C= 0.3, and (2) a developed portion, of 60 ac and C = 0.65. If the 10-yr rainfall intensity is 0.5 in/hr; what is the peak flow by the rational method?

  2. (20%) A trapezoidal channel is to be designed to convey 280 cfs. The bottom width is b = 10 ft, the side slope is z = 1 (1 H : 1 V), the bottom slope is 0.001, and the Manning's n= 0.014. Calculate the design flow depth using trial and error.

  3. (20%) A rectangular channel has a discharge q = 2 m3/sec/m. What is the critical depth?

  4. (40%) Please answer questions in a brief statement.

    1. What is baseflow? Where does it come from?
    2. What is the time of concentration? What variables does it depend on?
    3. What is the difference between the Manning and Chezy equations?
    4. What four forces are normally present in open-channel hydraulics? What two of these forces are present in hydraulic jump analysis?
    5. What is the lowest value of Manning's n measured by Barnes? What is the lowest value of Manning's n?
    6. What is the definition of the Froude number? What is its meaning?
    7. What is the definition of the Vedernikov number? What is its meaning?
    8. What is the maximum value of Froude number that can be encountered in practice? Why?