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21711-Concrete Arches, Showing Culvert 18 Feet in Diameter;
Pedro Miguel Locks, Panama Canal.
A system of culverts will be used in filling
and emptying the locks. The larger size cul-
verts, as shown in the picture, where the
area of a cross section is 254 square feet, run
the entire length of the middle and side con-
crete walls, making three of these large cul-
verts in each lock. Their magnitude may be
appreciated when we observe that they are
about the same size as the tunnels built by
the Pennsylvania Railroad under the Hud-
From each of the three large culverts there
run several smaller ones, about 7 feet in
diameter, which conduct the water undei
the floor, and gain access to the lock cham-
ber through holes in the floor. A cylindri-
cal valve controls the smaller culverts which
communicate from the middle wall with th'
twin chambers. Large valves, near the mitrc
gates, control the large culverts. Water is
fed in both directions by laterals from the
large culvert in the middle wall. This causes
a saving of water by allowing the water to
flow from one twin lock to another.
Copyright 1912, by Keystone View Company.
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