The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1899-11-13
DAM LOCATION.
Resolution Granting Change
Of Site Becomes Oper-
ative Without May or's
Signature.
REASONS FOR ALTERATION
Text of Contractor Flynn's
and Engineer Ferris Let
ters to Board Of
Works.
REASONS FOR ALTERATION


Mavor Hoos today did not sign the reso-
lution Of the Street and Water Boaro ap-
proving of the change of the dam site Tor
the new water supply, and It becomes
operative without his signature.
me change of the reservoirs location
was requested by Contractor Flynn in
aetter to Garwood Ferris. the city's super
yisfng engineer In that letter the con-
tractor said
..Since my letter to you of June %, 1899, in
reference to change of site for the DAM
from the Kingsiand site, as proposed IN
the plans accompanying my bids, 70 ste
up stream on the lands Of John and I'D
ward Banta, my engineers have been en-
gagged in making careful surveys OF the
dam site therein proposed and the reser-
voir site above, with most gratifying re-
suits.
s.I am now in position to present to you
absolute data as to the capacity OF the
Banta site, and a close approximation OF
the comparative cost and advantages OF
the two sites The results of the surveys
show that no deviation from the original
plan of one storage reservoir, capable OF
being increased from a capacity equal to
delivery of fifty million gallons to
capacity equal to a delivery of seventy
million gallons per day, upon the formula
required by the specifications, need be
made, as was feared at the time Of my.
last communication and referred to there
in Thus an additional storage reservoir
in the Longwood Valley will not be re-
quired.
ST now propose dam at the location
pointed out to you on the Banta prop
critics, where extensive excavations have
demonstrated to the satisfaction of my
engineers the practicability of securing u
good and substantial foundation. The
area of tributary water shed above this
dam is 1915 square miles
ssThe dam, as constructed for the de-
livery of fifty million gallons per day,
will have height to full water level
above the present bed of the river of one
hundred feet. The elevation of top of
waste weir being 1924 feet above high
water by the official Jersey City base
tWard 81, the bottom of the effluent pipe
Win be placed at an elevation of 25660
same base.
THE area Of the lake formed by this
dam will be s52 acres, and the storage
capacity above of effluent pipe will be
z,1so million gallons. To increase the ca
pacity to secure a delivery of 70 million
gallons per day the water level must
be raised to an elevation of S209S which
will give a reservoir with a storage ca
pacity of II, $50 million gallons. There
are no engineering brother difficulties IN
the way Of accomplishing these results.
Ny engineers estimate that the cost of
increasing the reservoirs capacity at the
Banta site will exceed the same cost at
the Kingland site, about $4,000, based on
prices of today
This increased cost at the dam and res
ervoir site, however, is more than madu
up by saving in the cost of the additional
pipe line required for a supply Of 70 mil
lion gallons per day, by reason of i'm
provements which detailed surveys show
can be made in the pipe and conduit line,
by reason of this location of the dam.
These improvements are generally as fol-
lows:-As determined by the survey of
my engineers as far as developed.
The original aqueduct, as proposed. in
my bid, was made up of three miles of
conduit in tunnel, with q capacity of 70
million GALLONS per day, and IS miles of
steel pipe with a capacity Of so millions
gallons per day, and in order to increase
the capacity of the whole line to deliver
70 million gallons per day, 10 miles OF
steel pipe, with a capacity OF 80 million
gallons per day, would be required by the
specifications.
"The new aqueduct, as proposed will
make the aqueduct consist of about two
miles of tunnel and three and one-half
miles of masonry conduit both on the
hydraulic gradient and capable of deliver
ing by the formula stipulated in the
specifications with a water surface one
foot below the inside of the crown OF
the covering arch of the tunnel and con-
duit 70 million gallons per day. The
steel pipe portion of the aqueduct will be
deduced from 10 miles TO II miles, thus
making saving when the works are in
creased to a capacity of 70 million gallons
per day of two miles of pipe worth, al
present prices laid $4,000. The tunnels
and conduits will at the outset, be con-
structed to carry 10 millions as required
by the specifications. Subtracting from
this sum the estimated added cost OF
raising dam and reservoir $4,000, shows
a net saving Of nearly 100000 by the re-
vised plan.
This saving, based on present prices oi
steel pipe, will in all probability be re
duced somewhat in the future, but ever
at the lo@est prices Of steel ever known
the saving will be very substantial. Il
addition to the momentary saving,
would call your attention to the immens
practical advantage of the works as
permanent engineering construction. 0
increasing the proportion OF masonr,
conduit and tunnel running withou
pressure and reducing the proportion 0
steel pipe, and also to the very crafty
ing fact that the new reservoir will nav
an average depth of water above effluen
pipe when full, of 26 feet against the av
erage depth of S.S feet in the reservoir 0
the Kingsland site.
"The elevations herein mentioned ar
based upon the differences between tn
base Of the State Geodetic survey and tn
official Jersey City base as determined b.
adjacent bench marks in Jersey City.
Careful levels now being run from It'd
water to Boonton may ehl re the figure
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