CIV E 445 - APPLIED HYDROLOGY
SPRING 2014
LAB No. 10 SOLUTION

  1. The results are shown in the following table:

    K (hr) 1 2 3 4 5 6 12
    Outflow (m3/s) 89.314 74.165 64.931 56.745 50.061 45.472 29.100
    Time-to-peak (hr) 6 7 7 7 8 8 9

    It is seen that the larger the K, the smaller the peak flow (greater attenuation), and the longer the time-to-peak (lag). The results of ONLINEROUTING01 for K = 1 are shown below.


  2. The elevation-outflow relation for width = 18 m is shown below.

    Elevation (m) 120 121 122 123 124 125
    Storage (hm3) 3.00 3.05 3.15 3.35 3.75 4.25
    Outflow (m3) 0 30.6 86.55 159.00 244.8 342.12

    The peak outflow is 140.246 m3/s, and the peak elevation is 122.741 m.

    The available freeboard for a width of 18 m is: 125 - 122.741 = 2.259 m. The results of ONLINEROUTING03 are shown below.


  3. The elevation-outflow relation for width = 16 m is shown below.

    Elevation (m) 120 121 122 123 124 125
    Storage (hm3) 3.00 3.05 3.15 3.35 3.75 4.25
    Outflow (m3) 0 27.2 76.93 141.33 217.6 304.10

    The peak outflow is 139.101 m3/s, and the peak elevation is 122.965 m.

    The available freeboard for a width of 16 m is: 125 - 122.965 = 2.035 m. The results of ONLINEROUTING03 are shown below.