The herald., 1897-04-20
Daily

| Paris ...... z, 100000 81 OO0.OO0 36 90
| Rome zeO,VJO 44'oovW ioVW
| 1t was deemed best to present you a
system ample in proportion throughout,
and while furnishing thereby the means
to supply water to 241 900 people at 200
| gallons per capita, under a no meter
system, that with the eventual introduce
tion of such regulation, no further en-
largement Of the works need to be an
| ticipated even at the time of an increase
to 4S2, 900 inhabitants.
1t is conceded by all persons having an
intimate knowledge and practical ex-
perience on the subject that more water
is wasted with a small supply in the
street mains than when the mains con-
tain a large supply of water under n
sufficient pressure. In the case of lawn
| sprinkling alone, with a scanty supply
under light pressure waste is induced
by too rapid absorption of the ground,
causing the attendant to leave the hose
on the ground and let the water run all
night. while with a plentiful supply un-
der high pressure, this job will be done
rapidly and satisfactorily and at one
| tenth of the quantity Of water. One
| thousand lawns treated every day by
| observable difference in demand made
upon the waterworks and the pocket of
the water rate payer.
The item of water for street sprinkling
also calls for large percentage Of addi-
tional supply to be considered in the per
capita amount. At present there are
used about 100000 gallons per day for
street sprinkling, covering about 155
NJ CT TN wi -
sprinkle all streets subject to this pipe
system within the city area, daily sup
ply Of approximately $500, 900 gallons
must be provided. This item, regarded
from the side Of the expense account.
would remain the same per mile whether
adjoining properties are eventually more
thickly built up or not than at the pres
ent time.
The item of furnishing water for flush
Ing sewers has to be regarded as a stand
ard demand upon our works, on account
of flush tanks depending entirely for
their supply upon the water mains, and
this item is therefore to be considered
in the measurement for a per capita
quantity. as the flushing will necessi-
tate daily draft upon our works. The
present sewer system requires 400, 900
gallons per day for flushing by means
OF 430 flush tanks which are now in use,
which number will be enlarged with the
increase of graded and paved streets.
To recapitulate the quantities which
make up total of the estimated 200
gallons per day per inhabitant, we have
TO supply wasteful consumers during
long rainless seasons. to provide for
probable increased manufacturing de-
mand, to supply large sections of the
city with water for lawn purposes, to
allow for liberal supply in sprinkling
our streets and to flush our cutters and
sewers, which total demand cannot be
met with less than 200 gallons per
day per inhabitant, under present unme-
tered conditions.
incidentally the benefits arising from
a plentiful supply of water brought into
the households, as well as to the fire hy-
drants, will reduce fire insurance rates,
and thereby produce in this indirect man.
ner large revenue to the population
at large
THE SOURCE OF SUPPLY
The Los Angeles river carries water
enough to supply all future wants of the
city, at all events, as far as the demand
have to be taken into consideration. 1t
does not lie within the scope of this re-
port to enlarge upon the legal ques-
tions connected with the rights which
the city of Los Angeles possesses in ref
crence to the flow Of water above or be-
low the bed of the Los Angeles river,
but dealing principally with technical
questions, we find that the main sources
H. ~.
proposed upper headwcrks on land known
as the Pomeroy & Hooker tract. situated
about eight miles northwesterly from
the city, and two miles south of the town
OF Burbank, while an additional supply
Is designed to be obtained further down
the river at about the point where the
present Los Angeles City Water COM
pany takes it's water from the river.
The numerous borings made, the close
investigations in connection Herewith
as regards the condition of a subterran-
eous flow of water beneath the bed of the
river, and also the results of lately in
stigated weir measurements, definitely
point to the fact that at the proposed
upper works continuous average flow
OF so cubic feet per second can be relied
upon, while at the lower headworks a
continuous average flow of 30 cubic feet
rer second can be anticipated, thereby
guaranteeing and making available for
the city water supply flow amounting
to 80 cubic feet per second, of which
amount 1887 cubic feet pSr second are
designed to furnish the requisite water
for the city distribution system leaving
1853 cubic feet for irrigation, supplying
Westlake and Echo parks on the west
and Eastside and Hollenbeck parks on
the east side of the Los Angeles river
All the water to be obtained at these
places and to be conveyed to the city
by means of closed conduits Is, previous
to its passage through these conduits,
made subject to natural system of Ill
tration inasmuch as 1t is not designed
to make use of the surface flow of water
but to draw solely upon the subterranean
sources, which water has gone through
a natural system of filtration by means
of percolation through the strata be-
meath and adjacent to the bed of the
river.
The test borings heretofore made to
determine the underground source Of
supply show very conclusively that a
natural filter-bed, consisting of success
sive strata of fine river sand. medium
coarse river sand, coarse red sand and
sand mixed with gravel, offers the very
best means Of purifying percolating wa