Sunbury American and Shamokin journal. [volume] (Sunbury, Northumberland Co., Pa.) 1840-1848, 1840-09-12


height of forty feet; built Of stone and hydr,ulic
cement. Immediately after the aqucluct leaves
the dam, it passes through tho /" Corporation Tua.
nell Is0 feet in length. Between this tunnel and
Harlem river the aqucduct is constructed over
twelve considerable culvcrts, varying in lcngh from
SO TO ne feet and making an aggregate of 1918
feet, besides a great number of unimrortant ones
and through eleven principal tunnels. The most
imp ,rtant of these tunnels is that at Tibbelts
B ook which l. $40 feet in le,gth, and cut IN solid
rock. The mex, in point Of length, is at Yonke's,
Gsi feet long, cut through earth and rock and
and that at Sing Sing. cut through solid rock, is
43G feet in length --Thc renvenue tunnel is 720
feet in length and the residue vary from ls6 to
4l6 Enet in length. The aggregate length of the
principal tunnels is A i27 feet.
There are, however. numerous unimpo tant ee-
vations and jepressions on the line, which require
either culverts or tunnels. At the Harlem river
the oqucduct reachr. 80 miles from tie dam, and
remains still miles short of the distributing basin
in this city.-At this psin', too, the aqneluct en-
counters lis most formidable mpcdment. The
&c fit at orb ary high tide, and its width at the
same point GEO f ct. Tae de or ption of the bridge
by which the river is to be crossed, ard oft resi-
due of the route, we quite from Mr.. tanners work
| before mentioned. Il says:
The bridge 0iIl be 1920 feet in lenpth, between
the pipe chambers at either end Is feet in With
inside of the IarapCt WALL; aud 81 feet between
the outer edge Of tie c'ping; l6 piers, built of
stone laid II courses Of unifrm thickness OF these
6 will be in lle river, and 10 on the land, g Of
which will be on the Westcbester side of the
stright.) The river piers VIII lie 20 by 40 feet a,
the ase, and 81 feet in height to The spring of the
arch dimini hing they rise in height. The
arches will have span Of 81 feet. The land piers
will be pro y on bly, less in size. Their height
varying according 10 the slope # the banks,
and the spon of these arches will BE- fifty feet
each.
The centrli height Of the arches over the stream
is 10 be 100 feet n owe hiah water level, IN he
| clear; aud t0e distance from high Tide TO the top
of the rarapct walls will be ll6 feet. The total
elevation of the sru ture. from its base at the bot
tom the strait To- the top Of the p.rapet, will be
about 1873 feet. The piers and abutments will be-
carried up with pisters the top of the parapct
with pri acIop of two feet beyond the face Of the
work. Those piers to be erected in the water, viii
commence wi h solid re,k, upon which tbs early
bed Of the st cam reposes. The estimated cost Of
this structure is S755, l30.
The bridge IS intended for the support of iron
pipes; and these will lie laid down, in the frs, in
stance, two or three feet in diameter, which it is
supposed WI be adequlte for the supply of water
to the city, for many years to come. IKE work
however, will be arranged, as to a1mh the inro-
duclion, at any tims hereafter, Of two four feet
pipes, whose capacity w II he equal To that Of the
gr nd trunk. The pipes will be protected from he
action of the frosi, by covering Of earth ur fee,
in dep,h, we'll soddcd on lhe SUFFICE. The aoue,
duct will discharge lis waters into the northern
pipe chamb r, why're the aquedurt resumes rs
course toward, the city. st the di lance of Lali
a mle, the line crosses a ravine of 80 feet to the
top line of the embankment; AMI at a sh ri dis.
tance beyond it euiers the Jume tunnel, 23 fee,
in length and G. miles f,om the city 4 ravinc is
pas ed after leaving the tunnel, 25 fe below
the grade line and after another still m,
formidable, presents itself; which required loun
dation Of 30 feet To elevate il to the grade. No
, impediment Of importance until the work
reaches Mani atlnvjlie, near which occurs a tun.
mel, 2l5 feet in length, the lonscs; in the whole
series. 1t is dcnominated The MaGhatlan Hill tun
mel, and s IS miles fron the poin; of outset at ia,
Croton river.
/ The water will lie con 'uctcd over tie Manhaltar
valley by mears of iron pires or inverted sy hons
The depression of the valley is los feet below tn,
grale line aud arrange nents of pipe cham ers, OF
each side of the valley, similr to that at Harlem
strait, viii be adopted here, The pipes are to he
! laid foundation of stone, covered with cours,
, of concrete masonry, six inches thick. After III,
pipes are laid, concrete is be worked under III m
, as a support, 8 inches wide, tnd IL high and III,
whole is to be protected with a covering OF car,h
to gulrd aga nst frost and other injury.
I The aqpeduct having terminated a, one ,p,
= chamber on VI .nha,an hills, t n.-comnences 4
another the Asylum hill, aud aitcr proceeling
short distance southwark enters the Asylum hi,
tunnel, 6l0 feet in length, which is the last Abau
three miles from The southern terminus Of this her
i cu'ean W, TX, the oqueGuct commences its passlg
, over several streets, the grading Of which has
mean pre,sion below lha, Of the squeducl, o
: about 40 feet this vale i. be passed by bldg
4 Of spoldng heigh'. The line OF aqueduc
runs 100 feet east Of the Ninth ayeAue and on th,
land, extending i;um street TO he vlher, flun