TM 5-820-3/AFM 88-5, Chap. 3
l. Smaller riprap sizes can be used to control
This equation is also to be used for riprap subject
to direct attack or adjacent to hydraulic structures
channel erosion. Equation 5-4 is to be used for
such as inlets, confluences, and energy dissipators,
riprap on the banks of a straight channel where
where turbulence levels are high. The riprap should
flows are relatively quiet and parallel to the
extend downstream for a distance approximately 10
banks.
Trapezoidal channels
times the theoretical depth of flow required for a
hydraulic jump.
Equation 5-5 is to be used for riprap at the outlets
of pipes or culverts where no preformed scour
holes are made.
Wide channel bottom or horizontal scour hole
D deep scour hole
D deep scour hole
These relationships are shown in figures 5-21 and 5-22.
5-24
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