CIV E 444 - APPLIED HYDRAULICS
FALL 2009
HOMEWORK No. 2 SOLUTION

  1. Using ONLINE PENMAN, with the given data:

    Before installation of tree line: PET = 22.82 cm

    After installation: PET = 21.60 cm.

    Savings: 22.82 - 21.60 = 1.22 cm

    Savings (volume) = 0.0122 m × 50 ha × 10000 m2/ha

    Savings (volume) = 6100 m3

    Savings = $300 × 6.1 = $ 1,830.00 during the month of May.

  2. Use ONLINE TIME OF CONCENTRATION

    Kirpich tc = 8.05 min.

    Kerby-Hathaway tc = 13.74 min.

    Papadakis-Kazan tc = 16.69 min.

  3. Use ONLINE TR-55, with the given data:

    With CN = 73:   Q100 = 1,051.81 cfs. ≅ 1,050 cfs.

    With CN = 87:   Q100 = 2,824.29 cfs. ≅ 2,825 cfs.

  4. Use ONLINE CONVOLUTION, with the given data.

    The hourly ordinates of the flood hydrograph are:     0., 112.54, 550.17, 1487.98, 2238.16, 1838.16, 1062.89. 400.17, 62.54, 0.