New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1889-06-08
r.rurv CONSTRUCTION OF TILE DAM.
Az ENGdNEkH folNHe WA
IN THE WORK.


IN THE WORK
,..n Mann Tune IA ~ wilmington WIN
- - n,,A associate editor Of the Enginoonns
y.wss y of New. York, has Just eompie'oo al oN 49,,
,,.n AZ the dam which caused the great "sS'Uo' n
"a wellington states that the dam was y. 80
...n,cs Of very inferior construction, ana oi 49,
.snI,y unxarrantod by good engineering p1ao'oe'
- sro Roth the original and recon
e,uoted dams were Of earth only. win no nea' 49,
- - ,srr.npod on the slopes. The original daul
49,, was made in rsmmed and waterod I'D Uts'
,,h,oh .t,ll show distinctly in the wrecAo" ue" -.
n,w end greatly added to Its stapins' Ou' s,,.-r
a. All appesrance simply dumped IN hko ." oi . -
railroad I'LL, OF. II rsmmed' SHOWS NO .. ., standng
.eect from IT, Much OF the Old par' Is ErH .s
-. ,rh,le adjacent parts OF the now worn S'
,rho,,v carried of. There was no ceh'rai wan y. y.
,nadIe or masonry either in the now of 0u ua -,
80 heen the tnvariable practice OF epsihee's t
a. tortv years to use one or the other 10 ous -.
dams of earth. Ii is doubtful 'hete 81 Trr,,od
aam or reservoir in any part Oh ui9 -,
60. as.r Sftv feet high which lacks THIS con'i~
wall. a.. r,rS ~ great
The reconstructed dam also pears inc US" H. 80
,.snn. Az eArelessneSs In having been mace hosf.y
,,o toet lower In the middle than AZ lne enas -,
.bouid rather have crowned In the mIuoo' 49,
h-..l begun at the ends the cut OF the Wa'cr S
-. h.en an Gradual that little or no harn n's"'
-. >..ratcd Had the dam been at once cut al u'o
.nss when the water began running over Ho ECU"
the sudden breaking Of the dam woun ha'e Oo"a
,east greatly diminished, possloy pfoiOnse" ~
ytt,a harm would have resulted. Inc eres' OF ,h0 '
asm hsd not been raised IN the reoohst'"""o -,
&c. Thn IA ov.rnow channel through the rock
,,u rr-nn,s but owing the sag OF the crest IN VIC
middle of the dam only FIVE and hair ieot oi "SSl
iu IL instead Of seven feet was necessary 10 III" w
over the crest. And the rock subway hA'''" "
hast had been further contracted by cioso si~"e
70 prevent the escape OF fish, eapped OS $50
sized timber, end in some slight degree also ny wv
tle foot.bridge. The original discharge PIP.
a, th. foot of the dam had been permanently closed
when reconstructed, and this, while minor matter
eompared 10 others mentioned further retuceo inc
po.sthie rate Of maximum discharge inc net ono''
Of Ali the differences OF condition was that inc ".'N
a A. stood was not much safer against eA0''s''
Aood. apart from It's inferior construction, hSn u''
original dam would have been with eros. ooy .,1s
.nd n half to four feet high above bottom OF he
- ,rt,Ixsy instead of feet. IL s impossoh
an saw n the riprapping Of the now part OF the o~
,was "A good as the old or not, since IL mas oeeh
c.,,4sd away. A large amount OF the oio npr@pPn'
and slope wall st remains intact s@e Na o. s1y srsa
SmouSt Of leakage through the dam before " UIOAe
Destruction came FROM ws bst mo- enUser Of Know
.,d GOOD standing fol- snch Work conla POSSIBLY nsr
been engaged on H. snee .,s 10 s and univsrss
.oHerstood requirements Of good prscnce. dne "a
mates Of the original dam indicate th@ sn ,bss. wa
ao2' . MAJ OF IL in The brohcn dam Tho rip
rsppins Was perey skin on "aSn race nsr,b WIN The dan
- ssS Snty.twn feet above water Two 70 one Ins1
dope half oo 70 Sns SSsste wss about on
,e cs below surface The earth was prsIYF =. sS al
ssors ior such dam m.E Tas 20 soo q pTddlc
ss EN- he fact Of it's standing iptac, since 1851 mo,
b. assOsd The fact that ,ss Sa r %s
espesaly hard the Older part Of the dam 10 WIZ
ssssnS the biessure Of the water.