Rock Island Argus. (Rock Island, Ill.) 1893-1920, 1899-07-12
RESERVOIR REPAIRS.
Continued from Fifth page.


to a head Of water in either filter when full
| and TO the additional unbalanced pres
| sure upon the wall caused by the opposite
filter being empty
To remedy these various defects we would
recommend.
l. That a solid compact concrete wall Is
inches in thickness and extending from Is
| inches below the bottom OF the footing up to
| u level with the floor and connecting ther,-
| with be constructed Immediately along both
| sides and adjoining the footings of the enti, G
| length of the walls between filter basins Nos.
| ] aud ana and l. and around the walls
| OF filter regulating house No. >. Having been
informed that the interior of all the footings
of all the ether filter walls had ben pro-
| tccted by puddle wall placed along side
and beneath the filter floor since the wallis
were constructed, and not having had an OPP
portunity to test the efficiency of this rein
iorcement against seepage, we are not IN
position to advise you regarding them.
Should it hereafter develop that the puddle
placed along side these footings is not a
sufficient protection against the seepage or
flow OF water through and under the footing
OF these walls, then the same remedy as
herein recommended TO be applied against
the interior partition walls may be effectively
used.
.. The leakage from one filter into the
other has shown that the so-called asphalt
filling of the joints affords no adequate pro-
lection against flow OF water through them.
therefore recommend that the sand and
gravel be removed from the floor of the
filters progressively and the joints uncov
ell ed be raAed out and thoroughly cleaned 10
grout should then be forced through these
joints under pressure to fill any existing
voids under the floor paving. after which
the joints should be jointed up compactly
with rich Portland cement mortar The
gravel and sand after being properly cleaned
and screened should then be replaced in sui.
able layers over the floor. Before the gravel
is replaced upon the floor. additional drains
should BE- laid and properly connected with
the effiuent pipe in such number and places
OF get the best efficiency from the various
LAYERS OF flterlng material.
?. In order to reinforce the various walls
around the filter basins, which consider
TOO light to resist the exterior pressure when
any basin has been emptied for the pun pose
Of removing the sand and gravel. would
tresses against the interior face Of each wall
dividing the walls into three equal spaces.
of filters Nos. l and 4 where we
would recommend three buttresses di-
vidng these walls into four equal spaces
and excepting also the walls between Nos
and and Nos and which require
buttresses. These buttresses TO be carried up
TO an elevation of two feet below the TOD Of
than two and one half fet below the for
To the objection of carrying
water under head in the conduit placed In
the partition wall between filters Nos. I and
!. would recommend that an iron pipe be
laid in the conduit between regulating
houses Nos l and and that the space
around the pipe and the Interior of the con-
duit be compactIy filled with Portland
other defects mentioned in this report and
minor matters not specifically herein referrci
to- should be remedied in a proper manner
according to the best judgment OF your sup
erintending engineer.
In regard to the clear water reservoir We
would refer you to our report that sub
ject of June 9TH which covered recon-
mencatiCn regarding that part OF the work
The successful completion OF this work on
the lines above outlined will require the most
careful supervision and inspection under the
direction of a competent and experienced en-
giucsr. Our recommendations based On
Investigations necessarily limited in extent
and as tho work of completion and repair
PROGRESSES conditions will develop which
may somewhat modify these conclusions i'm
their detail. These conditions must be met
struction proceeds and cannot be forseen or
fcrs;alled in this report. The forms and
method Of construction Of the several new
works aud repairs which We have above re-
commended will be shown by detail drawings
Of the same to be hereafter prepared We
estimate the coat Of the repairs and construc-
ton Of the two settling basins three filter
basins without roof. and the clear water
reservoir outlined in the above report at
ss4.172.o0. Respectfully transmitted.
Daniel W. Mead
J. T. Tanning.
G. H Benzenberg
Board OF Engineerrs-
EocK Island. ILL., July 10. 1899.
The council will meet again tomor-
row night to 90 further into the SUBJ
ject as well as the appropriation ordi-
nance and other matters.