Evening star., 1921-04-25
ARLINGTON WATER
PLANS COMPLETED
Survey Provides for Chance
of Getting Supply From
District Aqueduct.

The survey for water works and
a sewerage system for Arlington
county has been completed and the
report of the engineers, David J.
Howell & Son of Washington. was
submitted to the board of super
visors at a special meeting at the
courthouse today.
The board authorized the survey
shortly following the passage by
the general assembly last session of
the Jesse Arlington sanitary bill,
which gave the board power to make
Investigations for water and sew
erage systems for the county and to
negotiate for their installation.
The water works system design
contained in the report is based on
a meter system. with an average al
lowance of sixty gallons and a max
imum of 100 gallons per capita per
day. and Pimmit run and Potomac
river as sources of supply.
The supply would be filtered and
pumped, according to the report. un
less supply of filtered water is OBJ
tained from the District of Columbia
supply. and If so pumped only the
pumping and filtration plant to be
located at Rosslyn. with either grav
ity supply from Pimmit run or low
lift pump supply from Potomac river
at Chain bridge. or at entrance of
Sprout run at head of Three Sisters,
dependent on conditions when con-
Structed.
Four Distribution Zones.
Pumping and distribution are divid-
ed by the engineers into four zones
or areas of elevation which are desig-
mated as follows: Zone 1, supplied by
Fort Richardson reservoir; zone 2.
supplied by courthouse standpipe:
zone 3. supplied by Halls Hill reser-
COir- and Snnnlind nv Halls
Hill standpipe.
The entire cost of the water project,
with main lines Of distribution and
with the supply coming from Pimmit
bridge. is estimated at s1.026.2O0.
which includes intake works and sup
ply lines to filtration plant at $4,000.
filtration and pumping plant, $4,000,
and storage and main distribution
lows: Zone /. s177.OO0; zone 2. $1,000:
zone 3, s444, 500; zone 4. SITS 900
1t is proposed at first to construct
only part of the main lines of distri-
button. omitting intake works and
work in zone I. The total cost of this
construction is estimated at s474,400.
The estimated cost of the first distri-
button system is $2s5.000.
System OF Sanitary Sewers.
Regarding the sewerage system the
report sets forth a design based on
separate system of sanitary sewers
with an average flow for sewers of
fifty gallons and a maximum flow of
100 gallons per capita per day, and for
ground water infiltratoin an average
of 100 gallons per capita per day and
combined flow of sewerage and
ground water considered as equiva-
lent to maximum of 200 gallons per
capita per day, with size of sewers de.
signed to flow one-half full at above
combined discharge. The survey di-
vides the county into thirteen sani-
tary districts with three main zones
of sewerage discharge and two future
disposal plants. designated as Four
Mile run and Little river plants.
The estimated cost for trunk sewers
is: Four-Mile Run zone s167.s00: part
sanitary district. No. ), $4,000: Little
river zone. s14l.500. For disposal
plants. Four-Mile run, s1s5.40o: Little
river. s104,50o. making a total q:
s59S,400
First Cost. s225.OOO.
The first construction with part of
main trunk sewers and including Lit
tie river disposal plant is estimated
at total cost Of 1925. 900, not includ-
ing first lateral system. the cost OF
which is estimated at $190, 900.
The total cost of both the water and
sewerage projects is estimated at
s1.sa4. 500. with the first construction
work placed at $1170.40O.
The engineers Investigations EN-.
braced population statistics, estimated
growth. geographical and geological
conditions as affecting water and
sewerage system, and their report to
the supervisors today covered 125
pages.