The Minneapolis journal. [volume] (Minneapolis, Minn.) 1888-1939, 1904-09-09

more numerous pipes SO as to use up
| less of the available head in friction.
The committee also investigated the
practicability Of locating filters a mile
above the Northeast pumping station,
the river. The filtered water would
! flow to the Northeast station and then
| be pumped to the present reservoir. This
would be more expensive than to build
the works near the reservoir, and the
| cost of operation would be more than
tered water would be stored in the pres
emit reservoir, which could not be used
for sedimentation. An advantage is
that when consumption increases part
of the water will be pumped direct to
the city. This site does not compare
| favOrably with the sites near the reSer-
voir. "..
some distance and take the water at
higher elevation, bringing it down in
a. conduit, and 50 reaching the puriica-
ing. The water would have to be car
ried in this conduit from Dayton, TWEEN
ty-two miles above the Northeast
pumping station; In connection with
this, plan the flats near Coon Creek
lowing the filtered water to flow by
gravity to the Northeast station. The
cost of this plan would be $4,s42, o74,
and is not recommended because of its
Another plan considered was to build
island, take the water to filters on Sec
ton 81, mile above the northeast
pumping station, and thence to the
pumping station. These filters would
have to be depressed to depth Of TWEEN
ty-fve feet. The estimated cost, not
Including the dam, is $1,7O3,000. In
'terest, depreciation and operation
would be $104,700 annually, exclusive
of dam. The estimated annual charges
exclusive Of charges for the dam. are
corresponding charges for similar works
near the reservoirs. This site is, there
fore, less desirable. The cost of the
dam is estimated at 100000. '~'...
AS to whether the quality Of water
obtained is better at these points far
east station the, commission is advised
by the bacteriologist that there is no
material change at point above
Anoka and the present intake, and are
Of the opinion that there is not suffi-
cient reason for removing the intake *
fact that the water must be filtered in
any event. Mississippi water in it's
raw state is not suitable for consump
ton, even if the intake be removed as
tar as Dayton or beyond.
The Best Filter Site.
The best site for the filters from the
standpoint Of convenience and eco,
and operation is near the reservoir and
below it. An objection is that it will
reduce water pressure in the city by
about five pounds, providing no change
is made in the piping: The e; commits a1t
the Che reseTVoir be reinfo 9 At present
there is one 50-inch pipe. They
recommend an additional pipe line from
the new covered reservoir to Central
avenue, where it would connect with the
PPFoye o ae the ag8re to the h o1
sixty inches in. diameter. This would
: so reduce the friction, that even with
the reduction in level the water would
be supplied in all parts Of the city with
a head equal to that formerly main
tanned. .
A few isolated points, such as Pros
pect park, and Mount Curve, may re-
quire special distribution, but if neces-
sary it would be better to provide 1t
. than to increase the elevation to which
all Of the water must be pumped.
Figures on the Cost.
The estimate of cost Of sand filters
near the reservoir and below it is given
as follows: First, handling ear rad
yards at S., $3So,000; fltering mater
ials, sand and gravel, $4,000 cubic yards,
81 yard, $4,000; pipes, CRATES,
S5an o+ h0qs Use and al * @ $2ge
, pure water reservoir, holding 100000
gallons, 800, 900; new ,6-inch pipe line,
: $78oo0; land. pipes, drains, etc., $522S
900; engineering and contingency, ~
. per cent, $ll6,000; total cost 81, 900.
: The estima tied annual charges are: IN
! 800; operating filters 50 per million gal
: million gallons, $8.47.
l For the plant located near the reser;
voir and above it the total cost OF
saG the ifre is s Ct Ct d6se 6
8 million gallons, $500. -. .;z
y The cost Of locating the sand filters
near the northeast pumping station is
s figured at 81, 55S, 900. ...'..
e and below it, without .softening plant
4 100000. Mechanical filters near reser'
5 voir, with softening plant, $950,000.
u u Other Sources of Supply.
/ With regard to other sources Of sup
plies, the commission investigated wa
ter from artesian wells, from Mile
Laos and from Lake Superior. They
T. found no group of wells yielding. water
" in sufficient Quantity to justify the
q belief that the amount required BY
- Minneapolis could be obtained from
\ that source within practicable limits Of
+. area and cost. Moreover, it was ex
"a "a tremely hard, and its use in boiler!
ia 10 without the application of compound
n' is impracticable. Water from Mill
-, Laos would be satisfactory, altho it.
=. filtration would ultimately be neces
II sary. 81 =
~ The most important. objection is tn
~ great cost. Seventy eight miles Of &C
a. inch steel pipe, bringing 100000 ga
N Ions Of water day, would cost 5000
a 900. An 86-inch line would carry 80
n, 100000 gallons per day and cost $4,000
W 900. AS an offset, the cost of opera1
IN ing the pumps and filters. would b
1e saved. Last year the cost Of the opera
O. ton Of the pumps was $4,000. Ne
b. machinery would be operated NOR
n cheaply, but an increase in consum1