Environmental Engineering Reference
In-Depth Information
EL 1745.25
Maximum pool
EL 1726
EL 1690
Minimum flood
control pool
EL 1665
EL 1645
Intake for
water quality
conduit
EL 1610
Minimum
conservation pool
EL 1581
EL 1560
Regulating
outlet
EL 1520
FIGURE 10.29
Diagram of a selective withdrawal structure for Elk Creek Dam. (From U.S. Army Engineer
District. Rogue River Basin Project. Portland, OR, 1983. Howington, S.E. Intake structure operations study,
Elk Creek Dam, Oregon. Technical Report HL-90-16, US Army Engineer Waterways Experiment Station,
Vicksburg, MS, 1990.)
10.4.2.5 Energy Dissipation
Often, reservoir releases have considerable potentially destructive energy associated with them,
which, if not dissipated, can result in damage to the structure, scour below the dam, and other unde-
sirable impacts. An example is when water is passed through a spillway and down steep chutes, where
the water is basically in free fall. If that energy is not dissipated, it may often result in scour. For
example, the spillway releases between 1962 and 1982 from the Kariba Dam (Zambia-Zimbabwe),
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