2011 PE Review:. Michael C. Hirschi, PhD, PE, D.WRE Professor and Assistant Dean University of Illinois [email protected] Acknowledgements: Rod Huffman, PE Review coordinator Daniel Yoder (2006 presenter) Rabi Mohtar & Majdi Abu Najm (2010 presenters). Topics.
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Rod Huffman, PE Review coordinator
Daniel Yoder (2006 presenter)
Rabi Mohtar & Majdi Abu Najm (2010 presenters)
τf = σ * tan Φ =
τf = 744 lb/ft2 * tan(33.5o) = 492 lb/ft2
Essentially, if the flow is using all its transport capacity transporting sediment, there’s nothing left to detach more. Likewise, if the flow is detaching new sediment at detachment capacity, there’s no capacity to transport any sediment. Natural systems balance out…
qs = Cd * qd
McCarthy (1982) page 437-455
McCarthy (1982) page 440
For clay soil
For soil with cohesion and internal friction > 0
McCarthy (1982) page 474
(500 lb/ft2)(1ft3/ 10)(1/ 0.095) = 48 ft