The herald., 1894-01-01
whenever the city contains more than

whenever the city contains more than
l35, 900 people.
The sewer is 40-inch circular brick
along Wesley avenue to the settling
chamber built outside OF the Agricul-
tural park fence. The structure is about
62 feet long by rs feet in width, built in
TWO compartments, so arranged that
sewage can be admitted alternately to
either compartment; and the floor of
each is four feet below the grade line OF
the sewer. On the grade line in these
| compartments screens are built, thus
forming a pit four feet deep. This set
Ting chamber is designed to catch all
sand, stones, etc, which may be brought
down to this point, and by turning the
sewage into either compartment it flows
over the screens with greatly retarded
velocity, thus depositing all sand in the
pit beneath. When one pit is filled the
water is turned into the other and the
contents of the filled one are shoveled
out. This chamber will in all likelihood
not require to be cleaned out more than
once year, and that will be just after
the very heavy rains, which sometimes
force sand into the street manholes. By
means OF this structure it is possible to
recover any article of value, such as
rings, coins. ETC., which through the
medium Of house fittings may be
dropped into the city sewers, all of
which will ultimately reach the settling
basin.
At the end of this basin the first 81
phon begins and runs for distance of
three miles to Hyde park, Its size is
80 inches in diameter, built of wood,
banded every foot OF the length with
steel rods dipped in Asphalt and will be
continuously full of water. Along this
siphon irrigating hydrsnts are attached
so that the water can be used for irriga-
ton. Blow-of valves are also attached
go as to clean out the siphon should
any unforeseen circumstance admit sand
to the siphon.
At the end of this siphon in Hyde
park there is a valve which can back up
the sewage so as to give the irrigating
hydrants greater pressure and thus de-
liver the water on higher ground if re-
| quired.
From Hyde park a 4O.inch brick
conduit runs about a quarter of a mile
to the portal of the first tunnel. This
tunnel ia built of brick and concrete
throughout, is egR-shaped in section,
elk feet high by four and one-half feet
wide, inside measurement, and $500 feet
long. The tunnels were built this size
80 az to facilitate inspection and do
away with the necessity OF driving a
second tunnel to lay an additional
conduit; besides, the cost of the large
tunnel was very little in excess of small
one. The capacity of all tunnels on the
sewer ia sufficient to carry the sewage of
100000 people; from the end OF this tun-
mel a 40-inch brick conduit runs distance
fno tO ha oh lo of \
siphon. At this chamber provision has
been made by system of gates to turn
thlt water into the first lateral, or irri-
eating ditch. The second siphon is 3.2
miles in length, and, in addition to the
lateral already mentioned has two other
laterals, controlled by valves, go as to
enable the sewage to be turned on or off
whenever required in the laterals. Be-
sides theilaterals, which also act as blow
offs, irrigating hydrants are placed at
convenient points along the system.
The arrangements for the laterals,
three in number, render it possible. by
simply building bitches or conduits to
connect with the sewer, to lead the wa
ter tos lands lying some distance below
the sewermnd by opening or closing the
valve or gRte on the outiall, the sewage
can be governed. If may be allowed to
further digress. this ia most important
point, aB in the winter time the sewage
can be allowed TO flow into the ocean,
but whenever it is required, it can be
turned on at a moments notice. At the
end of this second siphon, which is SO
inches in diameter and has fall OF |
foot in 470 feet, gate is constructed,
similar to the one at the end OF the first
siphon, so as to control the flow OF the
sewage, and when required for irriga-
ton, stop it entirely and force it down
the laterals with increased pressure.
From the end OF the second siphon the
sewer is 40-inch circular brick conduit
and runs 12,0S0 feet to the portal of the
second tunnel, $50 feet long, similar in
all respects to one already described;
leaving THE tunnel, still continuing in |
3O-inch conduit for one.sixth OF mile, |
the portal Of the third tunnel is reached, |
This tunnel is 1850 feet long and Is the |
same size and character as the ones al |
ready described. The end portal of !
this tunnel is on the ocean side OF the |
sand dune, and the bottom of the tun-
mel at this point is about 81 feet above |
sea level. From the end OF this last |
tunnel cast iron pipe "a inches in
diameter and 1900 feet long leads into |
pho OSOoh W q polub OpO lCcb Ou 6nOT6.
This pipe rests on the bed OF the ocean.
With the exception of the second |
siphon, the 40-inch conduits and the
tunnels have a grade of foot fall in
800 feet.
The city, in addition to the right of
way for the outfall sewer, owns the right
OF way for the three laterals where the
same pass through the lands of Mr.. D.
Freeman, besides absolutely owning
about $50 acres of land fronting over one
mile on the ocean. The outlet of the
sewer is about the center of the 'front.'
age.
The present outfall sewer, when COM
pleted, will be OF size sufficient for the
requirements of city of 100000 peo-
pie, and is located through section of
territory where it is possible to utilize
every drop of sewage for irrigation. It
has been built upon as high a level as
possible, go as to command as great q
body of land as could be obtained, and
yet have velocity sufficient to cleanse
itself of all debris which might other
wise lodge in it.
One noticeable fact in connection with
this project is that the city will derive
some revenue from the sale of sewage.
thus receiving pay for that which most
cities throw away; not to take into con-
sideration the indirect gain OF the city
through the increased yield and value OF
the lands thus irrigated.