CIV E 445-APPLIED HYDROLOGY
FALL 2008
FIRST MIDTERM
MONDAY, OCTOBER 6, 2008, 0730-0845

Name: __________________________ Red ID: _______________________ 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%) A 225-km2 basin has 900 mm of mean annual precipitation, and the mean annual outflow is 3 m3 s-1. What percentage of precipitation is abstracted by the catchment on a mean annual basis?

  2. (25%) Fit a Horton infiltration formula to the following measurements:

    Time
    (hr)     		f
    (mm/hr)
    1 3
    2 2
    infinity1

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

    1. What four types of mathematical models are used in hydrology?
    2. Where does precipitation come from?
    3. What is the return period associated with the Probable Maximum Precipitation (PMP)?
    4. Which factor affecting precipitation is readily subject to modification by humans?
    5. What is the difference between potential and actual evapotranspiration?
    6. What four factors is the time of concentration a function of?
    7. How does time of concentration vary with flood stage? Draw a sketch for a wide range of flood stages.
    8. What is baseflow? Where does it come from?
    9. What do the Creager curves depict?
    10. To what five factors is to be attributed the recurrence of debris flows in the San Gabriel Mountains of Northeast Los Angeles? List them in order of occurrence.