San Antonio daily light. [volume] (San Antonio, Tex.) 1886-1907, 1894-07-23
ENGINEER GRAY'S REPORT.
PROVIDENCE. June 26, Is

PROVIDENCE, June 26, 1894.
His Honor, Mayor Paschal, San Antonio,
Texas.
SIR: Having been engaged by
your city to design a system of
Sewerage for the City of San An
tonic, / herewith submit my re.
port, together with drawings, etc.
The drawing consists of general
plan of the Sewerage System, to-.
gether with plan of outfall sewer,
on a scale of 200 feet to an inch,
showing the location and size
of each sewer and the loca-
ton of all manholes. Detail
plans OF manholes, sewer sec
tions, river crossings, pumping
stations, irrigation channels, ETC.,
together with set of tables giving
the lengths, grades, elevations and
sizes of the sewers.
The profies'of the streets, which
wer9furnished ne by your city en-
gineer, are herewith returned to
him, having the lengths, sizes,
grades and elevation of the sewers
placed upon them; these profiles
show the depth of the sewer below
the surface of the ground, and also
the location of the manhOles also
Specifications for materials needed
in the construction of the sewers
and other works; specifications,
forms OF contract, of bonds, and
form for bidders for construction !;
also an estimate number of feet of
each size Of sewer, and cost of
same; the number and cost of
manholes, together with estimate
of the cost of constructing the en-
tire system, and also estimate Of
the cost for the present population.
A set OF rules for the government
of drain layers, and a statement of
the different methods adopted for
assessing for the payment of
sewers, has also been furnished, the
same having been forwarded with
other data, on April 22nd, last.
will not spend the time in Men
tioning the benefits to be derived
from good sewerage system. Your
interest in the matter, and the &C.
ton you have taken, shows you
fully realize the value of having
your city properly severed.
AS is we'll known, the sewerage
systems which are most generally
in use are the Separate Systems,
the Combined System, and the
Double System.
The separate system COntem-
plates admitting sewerage only to
the sewers, excluding all rain water
and ground water as far as posi-
BILE. This system is, however, some
times modified by admitting a
limited amount of rain water from
roofs Of buildings.
The combined system provides
for taking sewage and storm
water in the same set of sewers.
The dou BILE system, as thename
applies, comprises two sets of sew
ers. One for receiving and con-
veying away sewage, such as liquid
wastes from dwelling,hotels stores,
&c, and another set for taking care
of storm water from surface of
streets, roofs of buildings, and so
much of ground water as may find
its way into them. The latter are
| called storm-water sewers and are
usually laid at a less depth than
house sewers.
The sewers may be much small
er in case of the separate system
than in the combined system and
are much less expensive, and where
taking care of storm water is not a
question to be considered, the sepa-
rate system is usually the best one
to adopt. Where the removal of
storm water from the surface OF
streets and roofs Of buildings is re-
quired to large extent, the COM
bined system, or the double system
is necessary.
From my examination of the
topography Of your city and from