New-York tribune., 1884-02-21
COST OF THE AQUEDUCT.
A REPORT BY COMMISSIONER THOMPSON
TIE AMOUNT ESTIMATED AT $15,Gf4,3OS, sU3JGct
To NOTIFICATIONS.

TIE AMOUNT ESTIMATED AT $15,GH 30S, sC3JGct
TO NOTIFICATIONS.
The Aqueduct Commissioners met yesterday af-
tcInOOn all the members being present. A COW-
runcatiOn was presented from the Chief Engineer
Of the Commission, but 1t was, not read as mo
Mayor announced that it would be considered III
executive session. No other business was Trans
acted in open session beyond the recelyt OF tho
following report from Commissioner Thompson;
In con piance with your resolution Of August = 1881
and subsequent resolutions, herewith present an esd
mate OF the cost CT constructing me new aIr' n
adopted by Your board the surveys OF when are now
nearly competed. The estimate Is based on Iale OF
progress Of 300 feet per month that being understood 10
be the mini mum rate nte nded required by The Com
missOners II Il assumed That the a4ieduct Wer m, III
tunnel IA rOughOut entire length will he m rock ine
finished diameter OF the aqueduct il taken 20 be circle
OF fourteen feet diameter the diameter oi the
tiOn sixteen feet. with allowance OF onethiru o
cubic yard IN excess Of that area for every iOOt m eg
beyond which the contractor shall not be paih unless
otherwise provided for IN the contract tbs eqa 70
775 cubic yards per real foot tunnel; that the aqe
duct tunnel shall be lined with average thickness oi
three rings o. brick equal to l745 cubic yards per h4
FOOT back filling concrete, average three tenth OF
cubic yard per nea foot The prices allowed are - er
cubic yard for rock excavation brckwork Sl3 per cuo
yard and back filling OF concrete - per cubic yard lh9
cost Of the shafts Is included in the - per cubic ya
the estimated cost OF the eXcavaon) as thelr cost -
small fraction OF the total cost oi the tunnel Ibe
prices the total S94 OF per lnea foot
10 TINS should be added the cost OF hoistlng IN shai
this Is estimated at one dollar per hundred iee
feet Of this length four hs viii be worked by shafts ana
olefth by portal Calling the total cost 8 per running
myth 81 800 feet is the syphOn line and that part o the
line under the Harlem River and though Of ess dametet
- per neal foot in addition 3fs0O feet at - yer
fOot$l39, 200 making the total cost ot the Hnbr con-
Valley $12,532G03. In addition to the ABOVE there
At Pocanhco River crossing 909 2309 iee'
At At Jay & %9gd H2g RsS lamp crossing 400
A. A. TibSiits ~. nTook o crossing .......... $500
10000 feet
Altogether 900 neal feet Of excavation for which
data
better estimate than per oea toU OF ~Doue ~
per cent IN excess Of cost Of tunnel
RECAPTuLATf)N.
Tunnel Aqueduct from Croton Lake to north ,o -,, coo
Agpssi@%Gt IN excavation as AOO''' $4,000
Gate a. house, and appuTenanoes croon Lake
raaDag aSq morn, af@ !iG5 Mah.tt1n RI f5 Valley So5
Piping from above gate house to to Central paTs
Win present mains aud gate houses pipes TO .-,.o
hive Capacity Of IOJ millions per day lls7l'0
sI5 81 8O3
At several there The atcnate netbodof
working the tunnel excavation by aits which ad)pte1
would slightly modify Iae tOL M =, ~ " co. 10Y Nv
best in the present case to make the estimate o "VTA ~
shafts and portals only me pres aIONrt I 5t.e
jay Goud's swamp and the Pocanteo River VII DO
doubt modified when we have more ln5 5tMdIoh itVh
the explorations now beiaS male win lha ~
fair price for tunnel excavation az the rate oI az
vance Of 200 feet per month Is dlHu' mlt.rL m.a IN
decide There il really guide from any "or e1 d
ms county applicable the present case il u Del ia
that the price above adopted viz, 81 per cnDS ar rce
j T.,e-i naer
yos adoprd after con fereuce with the CmeI Ehgneer
Of the Aqueduct Commissioners, Mr. Churcn "no m % - ase
agreed thai tins vas proper price % fe &m ~ . 40
of the present estimate. All the prices " y [ ,he
rs low or possibly lower than the proper execution o' JIG
work Will Justify ,o a,,o mar Muscoot
also submit specifications for o Gam nesr I 80
Mauntan C'roton Lake, and general pab ioI We pa
% ttss I.Tern River The site herein pleseniedIo
The Nuscoo Dam the one chosen y the sntFy VI Va
1S-5 In has been recently resurVeyed OuI boie DOis
need o he nlsde I'm order 10 make co,e es-,c Va ea
cost NJ the foundation and the side speu'Way Ie pao
for the D0 see OF the Harlem River provides lo ~
Nv of 300 900 900 gallons 20 be carried across tIe s'
into the Central Park Reservoir by laying anliiontt
jnss oF capacty o. l00 100000 gallons fcul pipes VI
- fnnr incles in diameter win carry tbs qltntty