EP 1130-2-520
29 Nov 96
AA-3. Downstream of Structures.
a. Navigation Projects, Flood Control/Storage Dams, and Local Flood Reduction Projects.
The hydraulic line will be determined at a location beyond which all the flow filaments move in a
downstream direction and for the prescribed flow criteria in paragraph 1 above. This location,
depending on the individual design considerations, may fall within or beyond the terminus of the
project structure. Data from site-specific model studies should be used where test conditions are
still applicable; otherwise, this location will be determined based on hydraulic jump or other
appropriate calculations. For lock discharge areas, the hydraulic line will be set beyond boil and
eddy limits which are strong enough to capsize a vessel and/or draw an object to the source.
b. Hydroelectric Plants, Training Structures, Outlets, and Pumping Stations. The hydraulic
line will be set:
(1)
beyond boil and eddy limits (defined above in paragraph AA-3a.) as determined by
on-site observation for pump stations, submerged outlets, and hydroelectric projects; and
(2)
at least two lengths downstream of the largest dimension of dikes and spurs for
training structures.
AA-4. Individual Considerations. Where multiple-type structures coexist, the hydraulic line for
each component shall be computed using the criteria in this appendix. The hydraulic line farthest
from the facility will be considered the hydraulic line for that facility.
AA-2
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