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4.6 CHAPTER FOUR

FIGURE 4.3 Ohio River intake (shore structures).

78 ft (24 m) in width and is approximately 115 ft (35 m) high from the concrete founda-
tion to the top of the station roof. Architectural enhancements were included to address
aesthetic concerns due to the intake's location in a highly visible area and close proxim-
ity to the Greater Cincinnati Water Works' existing 1890s vintage tower intake.
Alternative intake systems should be considered to identify the most cost-effective so-
lution that satisfies performance criteria. Examples of alternatives that may prove useful
in overcoming low-water and flood difficulties as well as bed load problems include an
exposed or submerged river inlet tower and shore pumping station, siphon intake, foat-
ing intake, movable intake, and well intake.
Siphon well intakes are usually installed in rivers and consist of a shore structure that
receives water from the river through a siphon pipe (Figure 4.4). The siphon pipe inlet
may be a submerged crib equipped with a trash rack or simply a screen section attached
to the open pipe. Siphon well intakes have a record of satisfactory service and are gen-
erally less costly than other types of shore intakes.
Figure 4.5 shows the Louisville Water Company crib-type intake located on the Ohio
River in Kentucky. The design capacity is 120 mgd (454 ML per day). The intake in-
cludes multiple screens mounted in a concrete crib structure constructed on the river bot-
tom. Parallel 60-in. (1.5-m) source water conduits enable redundancy and increased hy-
draulic capacity to the pump station. Provisions are included to backflush each source
water conduit from the pump station. The conduits also include chlorine feed capabilities
to control zebra mussels, Asiatic clams, and freshwater sponges.