CIV E 445-APPLIED HYDROLOGY
SPRING 2011
FIRST MIDTERM
MONDAY, MARCH 28, 2011, 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. (30%) A 185-km2 basin has 625 mm of mean annual precipitation, and the mean annual outflow is 1.2 m3 s-1. What percentage of precipitation is abstracted by the catchment on a mean annual basis?

  2. (30%) Fit a Horton infiltration formula to the following measurements:

    f = fc + ( fo - fc ) e -kt

    Time
    (hr)     		f
    (mm/hr)
    1 2.5
    2 1.5
    infinity0.7

  3. (40%) Please answer questions in a brief statement.

    • What four processes are responsible for the lifting of air masses to produce precipitation?
    • What is albedo? What is the albedo of a rain forest such as the Amazon? What is the albedo of a desert such as the Sahara?
    • What is the difference between potential and actual evapotranspiration?
    • What are the typical upper and lower limits for stream slopes in nature?
    • What do the Creager curves depict?
    • What is a lysimeter?
    • What is baseflow? Where does it come from?
    • 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.