Los Angeles herald., 1891-12-30

| tempt the storing oil wafer at tnab slte
to any considerable extent. One day.
supply is all that can be provided for al
moderate cost.
PROVISIONS IN CASE OF ACCIDENTS.
Reservoir No. Z however, furnishes
the means for ample storage. The
water in it raised to a depth of thirty
feet at the lower dam, will cover an
area OF seventy-five acres, and amount
to 1856 900 900 gallons. This would rep.
resent supply for about eighteen days,
for population of 100000, allowing
each person 100 gallons per day. 1t
will be seen therefore, that the city
can be we'll protected against the evils
resulting from possible accidents to the
head works and pumping plant of dis
trict No. 8, or even to the head works
and supply conduits of both systems
No. and No. 3. To make provision for
such an emergency the main pipe Of dis
trict No. is made large enough and 80
located as to enable one to adequately
supply through it, also, district No. 8.
1t will be observed on the accompany
ing map that the main for district No. l
lands at Seventh street and Pearl street,
and is then carried down Seventh street
to supply all the territory south OF it;
but, at the same time, connections are
provided with all the mains pointing to-
ward Seventh street, and lying in the
streets running north and south in dis
trict No. 8.
Now, if anything happens to the sup
ply works of district No. 3, all that is
necessary to be done in order to furnish
water to this district is the opening of
the gates at Seventh street of the sew
eral mains belonging to district No. 3,
closing at the same time the main gate
at the reservoir of the latter system.
The repairs of the supply works of the
impaired system can now be made with
out interfering with the daily supply in
any part of the city. On the other
hand, if reservoir No. should fail, or
the supply works belonging to it were
destroyed, the gates of district No. at
Seventh street could be opened and dis
trict No. would receive its supply from
district No. 3, and if the latter district
was provided with a high level reser.
voir, district No. 2 could also be pro-
vided for from district No. 3 in case OF
need.
OF course, in case of either emergency,
as assumed above, the actual supply is
only one-half of that when both
supply works are in operation but in
either case we will have 10000 900 gal
Ions per day for population of 200 900,
or 100 gallons per person per day, which
is ample for domestic purposes and with
proper restrictions, also for all purposes
during the repair OF the works.
A system of this kind, as can be
readily conceived, will be very efficient,
and nothing can be urged against it
except the necessarily large annual ex-
penditure which its operation would en-
tail.
The supply conduits to the reservoirs
and the pipes for the entire city have
been proportioned for daily supply of
200 gallons per person. At present the
consumption is 120 gallons per head per
day.
1t may appear, therefore, to some
that the assumption for a consumption
OF 200 gallons per head per day is quite
excessive, but it must be remembered
that in case of confagration the capac-
ity of the pipes should not only be suffi-
cient to furnish ample water to extin-
guish fires, but at the same time yield
the usual supply to the consumers.
However, the minimum size Of the
pipes, even if adopted to the foregoing
data, should not be too low; the prefer
able minimum size, in my judgment, is
six inches, which may perhaps be re-
duced, with high pressure system, to
five inches, and this should only be
used in side streets and the residence
portion of the town.
The minimum size for the business
streets ought to be put at eight inches.
AN ESTIMATE OF COST.
Below will follow an estimate of the
system as outlined before. To recapitu-
late the requirements of the system, and
to give an approximate estimate of its
cost; we have:
Headworks at upper source ...... O,OOO 90
4s;inch supply conduit to reservoir ~ ~
Dams and reservoir No 7 7........... 100000
Total al........................ $lS1 100000
u.-DIsTRICT NO l.
3O-inch main to Seventh and Pearl,
"a inch TO Main street on Sew
euth, 2O-inch on Seventh 10
river ........ .........--. .SS2o OoOOO
Secondary mains in streets. 3S> 10000
Total s6l3, 900 90
The present requirements of this dis
trict could, perhaps, be met with an ex-
penditure OF SAC. 10000.
II-DIsTRIcr NO. o
A. West of river.
High level reservoir, capacity
100000 gallons ................ $4,000 90
Two 100000 gallon pumps and
Force main. gates, etc. etc. ... 1880 90
Principal main, 16inch .......... $4,000 90
Secondary mains. ns................... 10000 90
Total s259, 500 90
Daily expense OF pumping, local at
$500 per ton) ................... $65 90
B. East of river-The approximate
cost of this system will be about the
same as that west of the river, provided
the water is pumped from reservoir
No. S.
Daily cost of pumping ............ SO 90
TOTAL COST OF DISTRICT NO. 2.
2................ ................... 100000 90
Total ....... ....,................ $519, 800 90
Total daily expense of pumping,
1923.
The present requirements of this dis
trict could be met with, at an outlay of
about $500, ,000 a daily expenditure for
pumping of $50.
To this has been added $1S1, 1000 for
the headworks and reservoir.
Iv-DIsTRIcT NO. 3.
Headworks at lower source .........$ 10000
Forty -eight-1nch supply conduit to
Low level reservoirs .. $4,000
High level reservoir r...-............. 10000
Force main. ............ ......... 10000