Those Dammed Lakes - Hydro-Environmental Analysis: Freshwater Environments - page 297

Outlet works

Spillway

Gate control
house

FIGURE 10.11 Fishtrap Lake, Kentucky. (Courtesy of the U.S. Army Corps of Engineers, Huntington
Dist r ict.)

10.3.3 S tructuraL d aMS
Structural dams rely on their structural coniguration and include arch dams, buttresses, and lood
walls. Arch dams are curved and depend on the arch action, as well as the weight of the dam, for
their strength. Arch dams are considerably thinner than gravity dams and require much less mate-
rial, so they are often more cost effective. An example is Hoover Dam (Figure 10.12).
The face of buttress dams is held up by a series of supports and may be lat or curved. These
dams are usually made of concrete with steel reinforcement and may be solid or hollow. An example
is the Daniel-Johnson Dam in Quebec (Figure 10.13).

FIGURE 10.12 Hoover Dam. (Courtesy of the Bureau of Reclamation—Lower Colorado Region.)