On the other hand an editorial in the Engineering News of February 25,
1909, says, “We can testify from actual personal observation and study
of the dam site and of the borings and pits that the Gatun dam will be
as safe and permanent as any structure ever reared by man”.
In the President’s message of February 17, 1909 there is this
statement, “As to the Gatun dam itself, they (the board of engineers)
show that not only is the dam safe, but that on the whole the plan
already adopted would make it needlessly high and strong, and
accordingly they recommend that its height be reduced by 20 feet, which
change I have accordingly directed”.
In the Engineering News of April 1, 1909 is the following statement,
“If a private corporation, not subject to the clamor of public
criticism were confronted with the task of throwing a dam across the
Chagres Valley at Gatun, they would build a structure which would be
not more than one-fifth the size of that which is now being built
there”. Farther on in the same article a comparison of the Gatun dam
with alluvial dams of India and the levees along the Mississippi is
summed up with these words, “Compared with any and all of these the
conditions for safe and permanent dam construction at Gatun may be
considered ideal”. Is it any wonder that people are confused and
disgusted when they attempt to obtain the truth?
The length of the dam is to be 7,700 feet, but the natural surface
reaches or exceeds the dam elevation in three places for about 700 feet
in all. At the level of 21 feet above the sea it will be about 2,600
feet long in two sections, separated by Spillway Hill. According to the
engineer’s report the dam will rest upon brown or blue clay and silt.
Under the dam there are two geologic gorges, one 185 feet deep (below
sea level) and the other 255 feet deep. These are filled with river
alluvium and other deposits, consisting, according to official reports,
of silt, soil, brown and blue clay, rotten wood, sand, and gravel--the
most, if not all of it water bearing. The cross-sectional area of the
shallower gorge is 205,000 square feet and of the deeper one 120,000
square feet.
(For profile, cross-section, and plan see the following page.)
The dam is to consist of two piles of rock 1,200 feet apart and carried
up to 60 feet above mean tide with the space between them and up to 115
feet above sea-level filled by selected material deposited in place by
the hydraulic process. A slip occurred at one of these rock toes during
November, 1908, and caused considerable alarm throughout the country,
so much, in fact, that the President sent W. H. Taft with a group of 7
noted engineers to investigate. They reported that “A full study of all
the data and of the material, and of the plans that are proposed leaves
no doubt in our minds as to the safe, tight, and durable character of
the Gatun dam”.
Public-domain text, read in full here on John Shaqi.
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