Those Dammed Lakes - Hydro-Environmental Analysis: Freshwater Environments - page 303

• Intake structures, trashracks, gates/valves, and bulkheads (if appropriate)

• Conveyance features, such as conduit(s)/tunnel(s)

• A control structure, such as a gate chamber, gates/valves, an access shaft/adit/conduit,

along with operating equipment

• A terminal structure, such as a hydraulic jump stilling basin, an impact structure, and a

plunge pool

• A downstream channel

FIGURE 10.24 Downstream navigation gate construction of the vertical lift gates at Lower Monumental
Lock and Dam, among the largest in the world, near Kahlouts, WA, in 2011. ( Middle ) Project manager
Steve Hartman displays the mechanics and rope wires used to lift the 1.5 million pound gate. (From
USACE, Intercom 40, 11, 2013. U.S. Army Corps of Engineers, Walla Walla District.)

Water released
to lower pool
lowers dam

Water pressure from
upper pool raises
and holds dam

Hinge

Floating
drum

Dam
sill

Control valves

FIGURE 10.25 Drum gate ( left ) and drum gate on a diversion dam ( right ). (Courtesy of the U.S. Army Corps
of Engineers Institute for Water Resources.)