Find the required height ( h ) of water inside the cut in order to ensure a factor of safety of 1.5.

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b- Mark the following statement with True or False: 1. The protection works are now designed in respect to the scour depth. 2. Bligh's creep coefficient "C" depends upon the bed material. 3. The flow through a culvert can an open channel flow exist only. 4. Any hydraulic structure should be checked and designed for surface flow and subsurface flow. 5. The depth before the jump is called the sequent depth and that after the jump is called the initial depth.

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Chapter 9, Problem 9.10P

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Find the required height (h) of water inside the cut in order to ensure a factor of safety of 1.5.

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b- Mark the following statement with True or False: 1. The protection works are now designed in respect to the scour depth. 2. Bligh's creep coefficient "C" depends upon the bed material. 3. The flow through a culvert can an open channel flow exist only. 4. Any hydraulic structure should be checked and designed for surface flow and subsurface flow. 5. The depth before the jump is called the sequent depth and that after the jump is called the initial depth.

EXAMPLE 9.2 A cut is made in a stiff saturated clay that is underlain by a layer of sand under arte- sian pressure (Figure 9.6). 21 ft a. Assume h = 0, and calculate the maximum depth of cut H that can be made in the clay. b. Assume H = 15 ft and h = 0. What should the magnitude of the height of water h be so that stability is not lost? H 6 ft FIGURE 9.6 Saturated clay Sand Ysat = 120 lb/ft³ 13.5 ft Ysat = 114 lb/ft³

1) A triangular section has a side slope of s = 2, Manning's n = 0.02, Bottom slope of S0 = 0.005, depth, y = 2 m. Using Manning's equation (Eq. 24 in formula sheet) determine the flowrate Q. Use the Table in the last page to calculate A, and Rh (Hydraulic Radius) 2) Do the same for a rectangular section with B0 = 4 m, n = 0.015, S0 = 0.0025, and depth, y = 2 m.