The times. [volume] (Richmond, Va.) 1890-1903, 1902-04-27
TIE TlIFs7 IaIIMcND. sUNDA 1907


WIN not Be rendered perfectly clear. even
by many weeks OF sedime ntation, still
this. method OF treatment Will bring ar1ut.
great improyem ent In the characters the
water, whic a ter ten IS to twenty
days. IL fairly accepya bic 4ingappearance
So II. So. far from there being an Increase
IN the number Of bacteria. in . ames river
water thus stored. there is aSsteady$ De- le'r,
crease
Ia. Owing to the slow rate Of. subsi-
dence, a settling basin for this city shsu.os
have ascapacityE Of at least twenty days
supply eco OOD, 900 gallons at present rate
'of consumption, and sh ould be separated
into two compartments wit gates--=zz1or
communicated when desired, which would
permit the cleansing OF half the basin
without interfering@with the other
49, Tine construction Sof a basin of the
aforementioned size would aiso furnish
the means for reserving q twenty days
supply of GEAR water, collected at = av-ss
ora BILE tines. for use when the river be-
comes muddy.
TO- Its use for, this purpose alone would
secure clear water for nearly twice the
number OF days possible under our pres
ent arrangement. In illustration. during
1899 we had fairly good water clear O
but slightly turbid) for only 13oE GA 80 a Q
triile less than three-eighths Of the time.
With a storage reservoir OF twenty I'd : =
capacity, and our present neW. reservoir, .
sof five days capacity, water OF TINS cnar
acter could have been secured for 2s9
days which lacks but one of being Twice
the above figure. During the St days re-
naming ten to twenty days subsistence
would have furnished water greatly I'M.
proved in character.
III. The source of supply of the setting
basin would be the river itself, from
which ter would be conveyed. by gray.
ity. through q flume. Water would De
conveyed from the basin to the pumps ny
pipe laid in the bottom Of the canal and
would furnish the supply for the new
reservoir. While the water IN the caHal u
self would be usd only as motive poW. II
for the pumps. BY this mean, the great
est source of possible contamination 10 as
mentioned in 5. would be eliminated.
Is. Besides the advantages thus I'M
nediatcly obtained, such g, basin 4is an
essential prerequisite to the efficient a p.
economic working of any system OF nltIa-.
ton which it may be deemed ac"lsaole
to adopt later on
10. The advantages Of the proposed
settling basin may be moro brief19
summed up as follows: a. AS e storage
reservoir it would furnish clear water
Tor about twice the length OF time eacu
year that this is now obtained. AZ
a settling basin proper, It would lur11i L1
greatly improved tbut rot perfectly clear)
water at all times. g. The most irup 1,a,,
tant source Of possible contamination
would be- eliminated "a Such BASIN
is an essential preliminary step to the
institution of any moro perfect system the
adoption Of which may later on be deemea
advisable.
60 After constructing this settling
basin, experiments should be conducted,
Using one Of the divisios cf the new reser-
yoir for the purpose, to determine the
Possibilities of coaguIaticn and sedinen-
iation, it being at least probable that
this method may furnish a satisfactory
substitute for the more costly system OF
EJACULATION and filtration. Should the re-
| suit Of this test be favorable, the next
to be taken-at such time as desirable
would be the construction Of a coagu-
la,irg basin holding twenty-four hour 5
| supply.
| II. Should the results secured by the
above methods still fail to satisfy popular
sentiment. perfect Qualification may be
obtained by the introduction Of mechan1-
J cal filters. In this event there will not
| have been the slightest loss of either
| time or funds, since these basins would
constitute an essential part Of the equip
| ment required for the efficient and eco
nomic application Of mechanical flltrar
| ton e
WILL GET CLEAR WATER
AS shown in Dr. Alallet's report the
l water. Will DS CleSti= VI tS1t SiStal
times of long muddy condition OF the
| river by means of the sadimentation ba-
] sin only. Rv means of the sed1mcntat1on
basin and the coagulating basins, where
the chemical agent Of Ferric sulphate of
| iron is applied to the water taken from
| the sedim entation ba sin where the larger
! portion Of the clay. has been removed by
gravity, clear water at all times is as
sured at small cost and these two con-
| structions are necessary and prerequisite
| to any mechanical filtration. which may
| subsequently, be adopted: The introduce
| ton Of all three methods sedimentatlon,
| coagulation and mechanical filtration in
sure clear water for the people Of Rich
mond as determined from the expert
ments made by the chosen experts.
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