CE445-APPLIED HYDROLOGY
FALL 2001
FINAL EXAM
DECEMBER 20, 2001, 1030-1230

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%) Route the following inflow hydrograph through a linear reservoir:

    Time (hr)        0   1   2     3   4     5     6   7   8    9    10
    Inflow (m3/s) 0  10  20  30  40  50  40  30  20  10   0

    Assume baseflow is 0 m3/s, K= 3 hr, Delta t= 1 hr.

  2. (20%) Given the following inflow hydrograph to a certain stream channel reach, calculate the outflow by the Muskingum method.

    Time (hr)          0      1     2      3     4     5      6     7     8    9    10   11   12
    Inflow (m3/s)   10  20   40    80   120  150  120  60  50   40  30   20   10

    Assume baseflow is 10 m3/s, K= 1 hr, X= 0.2, and Delta t= 1 hr.

  3. (20%) Use the Clark method to derive a 1-h unit hydrograph for a catchment with the following time-area diagram:

    Time (hr)        0      1      2        3        4        5        6
    Area (km2/s)     12     20     42       66       30     16

    Use K= 2 hr, and Delta t= 1 hr.

  4. (40%) Please answer each question in one clear-and-concise paragraph:
    a. What is a proportional or Sutro weir?
    b. In reservoir routing, why is there no lag between inflow and outflow?
    c. Why is it not possible to have X greater than 0.5 in Muskingum routing?
    d. What is the difference between Muskingum and Muskingum-Cunge methods?
    e. Why does the time-area method overestimate the flood peak?
    f. How does the modified Clark method differ from the Clark method?
    g. What two types of storms can cause floods?
    h. What is the importance of worms in hydrology?