CIV E 445-APPLIED HYDROLOGY
SPRING 2006
FIRST MIDTERM
MONDAY, FEBRUARY 27, 2005, 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 124-km2 basin has 250 mm of mean annual precipitation, and the mean annual outflow is 0.25 m3 s-1. What percentage of precipitation is abstracted by the catchment on a mean annual basis?

  2. (25%) Calculate evaporation rate by the Penman method for the following atmospheric conditions:

    air temperature Ta = 20oC;

    net radiation Qn= 580 cal/cm2/day;

    wind speed v2 = 180 km/day;

    relative humidity RH= 75%.

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

    1. What is an aquifer?
    2. Where is the mouth of a catchment?
    3. On a global annual basis, what percentage of precipitation is likely to be abstracted as deep percolation?
    4. What is albedo? What is the albedo of a mirror? What is the albedo of a black body?
    5. What is the Bowen ratio?
    6. How are the Dalton, Penman, and Penman-Monteith evaporation equations related?
    7. What four hydrologic variables influence time of concentration? How many variables does the Kirpich formula have? What are they?
    8. What is an ephemeral stream? In what climate is it found?
    9. What is the difference between an evapotranspirometer and a lysimeter?
    10. To what five factors is to be attributed the recurrence of debris flows in the San Gabriel Mountains of Northeast Los Angeles?