HomeMy WebLinkAbout2767 Report, Louis E. Hawes, Engineer to Water Committee, September 11, 1901 m
LOUIS HAWES, Y
CIVIL AND HYDRAULIC ENGINEER,
TREMONT BUILDING, BOSTON• MASS. ......Bo-s-ton.,.A-.as..is...............................
Iir A. E. Scott , =
Chairman CO27Ilittee on Water Works .,
Lexington , Mass.
Dear Sir:-
The results of Lz asurements of the flog of water from
various sources near the Lexington pumping station, as shown by.
recent approxir.iate measurements taken wi -11 such inexpensive
apparatus as was available, was as follows ,--
INTO WELL NO. 1. Clear E7round-water.
From Ball Fi.eld filter gallery, av rage of
4 measurements taken frorr: Aug. 29 to
Sept. 9 , at the rate of - _ _
From the Deep well , average e - 12,�20 gals.per day
mPnts taken from Sept. 2o� �c, . at as the
a the
rate of
- - - - - - - - - - - - - - 91,526 " tt ►r
From tie Reservoir conduit , ground-water
by ;ravity , average of 4 measurements
taken from Aug. 29 to Sept. 9 , at the
rate of - - -- - - - - - - - - - - _ �. 143,784 n
�� ►�
The flow into Well No . 1 frorz the ground, or
rock at its bottom is in addition to
the above , but cannot be measured sep-
arately until there is a e011 ecting basin
for the other water to flog into. It
is probable that considerable of the
above flow is lost in well .I and some
Of it pumped over and over by the deep
well. pump - - - - - - - _
INTO WELL NO. 2. Clear ground-water.
From the Seaverns Spring, average of g
measurements taken from Aug. 24 to Sept .
9 , at the rate of _ _ - _ - _ - 19 ,062 gals. per day
The flow into Well. No. 2 from the ground or
rock at its bottom is in addition to
the above , but cannot be rueasured sep-
arately until the
proposed collecting
basin is built to take tie other water,
soille of which may also be lost before
r reaching the pump
i
i
i
1
pted at this neetin�.
as may be ado — _ _
CIVIL AND HYDRAULIC ENGINEER, -
.
........ .
..... ........................................................
TREMONT BUILDING, BOSTON, MASS. -
INTO y'JIML NO. 2. Highly colored water.
From wells 3 and 4 , average of 6 measure-
ments taken from Aug. 27 to Sept.9 ,
at the rate of - - - - - - - - - - - - 11 ,678 gals.per day
THE NEW WELL, Clear ground water.
The test well driven at the site of this
well Pumped 50 gal Ions a minute as
reported by the well driver , and during
a short test later of 3 hours the
quantity was about the sarre,, or as
reported by an assistant , from 40 to
50 gallons per minute.
Durine; th.P construction of the well
the excavation has been pumped to the
bottom almost continuously for five weeks
during which time about 1 ,400 , 000
gallons have been pumped into the brook
and wasted, or at the rate of - - - - 40 ,000
THE BROOK, at a Noirt just above the new well ,
fairly clear 1vater, being spring water
a little fur�her up.
Weir measurements were made from Aug,
01 to Sert. 7 which showed that during
the 5 weeks whe'r, the new well was being
pwaped or. continuously , the brook ran
to waste about 2 ,378 ,000 gallons,
or at the rate of - - - - - - - - - - 67 ,939
Weir measurements made in the brook
below the new well and also opposite
the pwrzping station, showed that the
flow of the brook was not materially
affected by the constructinn of the
new well. Nor does the Seave-rns
spring appear to have been affected by
the pumping from the new well.
RESERVOIR. Storage.
In addition to the small storage afforded
by the standpipes the Reservoir holds
in reserve for fire purposes or an
emergency , from 5 to 15 million gallons ,
depending upon the season, that is
collected m a i n 1 y from the fall and
spring rains , but is also contributed to
by springs , and which can be drawn upon
directly by the pumps at the Station.
as may be adopted at this ineetibg.
0�HAWES,
CIVIL AND HYDRAULIC ENGINEER' {
TREMONT BUILDING, BOSTON, MASS. ''-•••• -•-••--..., - 3
......................................................
THE NEW is 15 feet in diameter and 16, 5 if
feet deep . The walls are of brick resting
on stone work and ledge. Sufficiently
substantial ledge for, ru.pporting t„e
masonry appeared under only a sinall
por-
tion of it at the expected depth,
necessitating more
e
anticipated and the laying lof colr.sidas
erable stone wrork in cement mortar.
As the water comes out of the ledge; ,
the brick work was started on the ledge
several feet lower than planned. Clay
Seams and Pockets were sealed over and
clean sand Placed in the excavation
outside the brick work from bottom to
"top to protect the well from infiltra-
; ` lion of discolored water.
C
Yours respectfully ,
. e �•-r�
��oted: - `fi o accept be rep committee as a partial report
and that the same com.nittee be instructed to continue their investi-
#rations, to complete the work begun and to carry oizt such other measures
` as may be adopted at this ng
meeti . 'E
z.
I
I
f •
i
i
x I
I '
• 1
i
,1
1
1
S
l
1
7 �\