The herald., 1897-04-20
ter through these different strata to a

ter through these different strata to a
considerable degree from organic or in
organic impurities contained in the wa
ter; at all events, such percolation will
act as a strainer and prevent the debris
and silt, otherwise carried along by the
river. from entering the pipe lines and
reservoirs.
These test borings have also demon
fined plane of saturation beneath the
surface, beginning at an averoge depth
of four to ten feet and extending down
vertically from twenty to forty feet.
1t is designed to obtain the requisite
amount of water by a system of infiltra-
tion galleries, as indicated in plans on
drawings Nos. 2 and 8. These galleries
are to be located on that part of the Pom
eroy & Hooker tract, lately condemned
by the city of Los Angeles and are de-
signed to consist Of approximately 500
feet of main galleries with $500 feet of
laterals. The grade of the main CALLER
les will be located from twelve to twenty
one feet below the plane OF saturation,
which will insure, even at time of excess
sive drouth, an. abundant supply for
this water works system.
These main infiltration galleries are
to consist of arched subways of sxs
feet cross-sectional area; while the lat
erals are designed to consist of two lines
of subterraneous pipes twenty-four
inches in diameter, laid with open joints
and entering the main galleries at con-
venient points.
A main gatehouse at the end of these
galleries connects with the beginning Of
the main conduit, leading therefrom to
the city, and provisions have been made
by means of settling basins, waste
sluices and blow-offs to make the need
ed repairs, intercept the sand and to
control the water at this point
The location of these galleries at the
source of supply is exceedingly favora-
BILE for the installation of filter-beds, in
case necessity for the same should ever
arise. Such filter-beds can be located
Immediately above the galleries, and the
surface flow of the river could be artifi-
cially diverted toward these beds. and,
percolating through the same, would en-
ter the infiltration galleries purified and
of the same quality as the subterranean
flow of percolating water.
In the estimates presented the cost Of
filter-beds has not been included. as the
possibility of pollution of the surface
flow of water in the watershed of the
San Fernando valley above our source
of supply is so remote and needs to be
anticipated only in the event of the
establishment OF large manufacturing
concerns within close range to the infil-
tration galleries
Our supply will be drawn from an im-
mense basin of underground stored wa
ter, subject to the beneficial action of a
natural filtration in it's course of slow
travel through the porous underlying
strata; will be infiltrated and conduct
ed in closed conduits and stored for dis
tribution in covered reservoirs, SO that
the water gathered and dispensed in this
manner will not see daylight until It
leaves the tap of the consumer.
WHAT WE DRINK
A sanitary analysis made July 16. 1896,
by w. T. Wenzell, chemist to the board
of headth of San Francisco, gave the fol-
lowing results:
Total solids .3y. l000
Free ammonia ....s..s............. UNIV
Albuminoid ammonia .................. .QQi6
Nitrogen as nitrates and nitrites.... .0000
Oxidizable organic matter ............ 1000
Chlorine as chlorldes................ 2.47S0
These results prove ccnclussve'v that