CIV E 530 - OPEN-CHANNEL HYDRAULICS
SPRING 2012
HOMEWORK No. 5

  1. Use ONLINE CHANNEL 01 to calculate normal depth, velocity, and Froude number for the following cases:

    • Q = 150 m3/s, b = 10 m, z = 2, So = 0.0005, n = 0.025
    • Q = 250 cfs, b = 20 ft, z = 1, So = 0.001, n = 0.030
    • Q = 350 m3/s, b = 25 m, z = 1, So = 0.0008, n = 0.035
    • Q = 450 cfs, b = 15 ft, z = 3, So = 0.005, n = 0.035

  2. A recent flood on Clearwater Creek has left observable water marks on a certain river reach. To estimate the flood magnitude, hydraulic data has been measured at two cross sections A and B, a distance of 2,350 ft apart. The reach fall between the cross sections is 11.1 ft and the average Manning's n is 0.04. The upstream flow area, wetted perimeter, and α coefficient are 550 ft2, 55 ft, and 1.17; the downstream flow area, wetted perimeter, and α coefficient are 620 ft2, 52 ft, and 1.10. Use SLOPE AREA to calculate the flood discharge.

  3. Calculate the unit-width discharge in an overland flow plane, under laminar flow, with mean depth of 3 cm and slope of 0.001. Assume water temperature T = 20 oC. Report discharge in L/s/m.