Evening star. [volume] (Washington, D.C.) 1854-1972, 1882-03-22

III 1861. ~
III loIo-- .............. .E4.lIi,i9I
In 1871. 90. 252 932
IL 80,
In 1880. 81 TAO 13S
In 1881. % 525 99l
The committee is of opinion that from
26.OOO, 900 to 27.0OO,0OO gallons per day is the
maximum that can safely be relied upon from
the three mains now in use. This guam
tity. If properly distributed. the committee
believes to be an ample supply for the present.
but owing to the different attitudes in different
parts of the city, the distribution cannot be so
regulated as to meet the necessities of the
higher lands except by the use of steam pumps
to raise the water. and the pumps now in use;
though driven to their full capacity. fail to
furnish an adequate supply to the people
residing in the more elevated parts of the city.
10 meet this necessity, more pumps must be
put to work. or larger quantity of water must
be brought from the Potomac.
THE USE OF STEAM PUMPS
involves large and continuous expense and
they only serve to distribute to the high levels
their proportion Of the &c, 900 600 or 81 OOO 600
gallons, while by a sufficient increase in guam
tity all but the highest points in Georgetown, it
is believed. can be supplied, and SO reduce the
area to be supplied by pumps that small pro-
portion of the pumps now in use will fully sup
ply it.
After full conference with General Megs who
constructed the aqueduct. Colonel Casey, the
engineer now and for several years in charge of
the same, and Major Twinng, the Engineer
Commissioner Of the District. the committee is
satisfied that. to secure uniform, continuous.
and increased supply of water in Washingt on
the dam at Great Falls must be completed by
Raising that part already constructed 2-1O feet
so as to bring it to las feet above datum, and
extend the same at that level across COnn's Is
land and the Virginia channel to the Virginia
shore.
IN RESPECT TO THE DAM
and the estimates of cost of same, Col Casey
says:
The dam now in place at the Great Falls
reaches from the Maryland shore to the east
side of COnn's island. 1t is a cut-stone dam,
only partly finished 1t is Obliquely to the
thread of the CURRENT its downstream end
being on the Maryland shore. and is / $50 feet
in length. Its top is at 1850 feet above the
datum plane. To finish the part commenced to
the level of l4S feet. carry it in about the same
direction and at the same level across Conn's
island to the Virginia shore. will require an
addition to its length of LILO feet, making its
total length 5000 feet
Tie estimated cost of the completion of this
dam to the level of 14S feet is as follows:
5.5l0 cubic yards excavation at 81. $50
sd cubic yards cut stone masonry, at
@SS-O ia E19
sos cubic yards ripraps at So ........ 1886
l.aol cubic yards coping, at So. ..... 8,lO6
MAKING ......... S145. ISL
To this sum must be added the amount that it
Will cost to condemn that part of the land not
owned by the government upon which the dam
already constructed rests and the land neces-
sary for its extension across COnn's Island to
the virginia shore. The committee has no data
upon which to base an estimate of this item.
There must also be added to the cost of COM
pleting the dam, the cost of protecting the
Chesapeake and Ohio canal from the additional
flooding which the heightening and extension
OF the dam would cause intime of high water
This item is estimated by Col. Casey at Sl2,-
500, making the whole cost of completing dam
exclusive OF cost Of land. Si57 AL.
The committee think it safe to say that the
Whole cost of DAM including cost OF land, will
not exceed $4,000 or 100000
Colonel Casey recommends as 'the least cost
ly and most expeditions method Of increasing
| the supply. that another main be laid from the
distributing reservoir to Lincoln square on Cap
itOl Hill, feet in diameter and located on a
! route to be determined from careful survey; it
WOULD convey to Capitol HILL at an elevation of
Id feet above datum, "a DOC, 900 gallons per day.
but looking to the future, when the whole
capacity OF the conduit may be required to sup
ply Washington and Georgetown, the extension
of the conduit to the high grounds north of
washington would doubtless be the best sou-
ton of the problem"
The main that he proposes will be 81 200 feet
! in length. and is estimated to cost when laid.
and the streets restored to their paved condition.
sS0 per foot, aggregating 1924 600.
THE EXTENSION OF THE CONDUIT
General Meigs and Major Twining concur in
| recommending the extension of the conduit to
the high grounds north of the city as the best
means OF remedying the present evil Of made
quate supply, differing only as to the point to
which it should be extended
The point recommended by General Meos ia
near the junction Of 10th and Boundary streets,
with proper main connections. furnishing three
separate services one for all the CITY living at an
attitude of more than 80 feet above tide, another
for all that lies between so and 90 feet above
tide and the last for all the city which lies less
than 50 feet above tide.
The estimates submitted by Gen. Meigs in 1879
were as follows:
51-inch boiler-irOn pipe, for middle ser
vice, o,oU Ieet. $75, 600 90
42-inch boier-iron pipe, for low SER
vice, $500 feet ...... 81 200 90
2o-inch east,iron pipe, for high SER
Land damages, right Of way under ~
strip 10 feet wide over tunnel, and
half acre at shaft, say in all 10 acres. 5000 90
CONDUIT 90 miles long. AGO, 600 90
Making. .:...-..:. ...............6 ga, 400 90
| Upon revising estimate for extension
OF conduit at this time, Gen. Meigs
aduS To the above. ........... 43 600 90
.UO IN
He does not revise the estimates of 1879 for
the iron pipe. but says. as prices have advanced
since that time he refers to Col Casey for accu-
rate information as to the cost Of iron at this
| time.
| Col. Casey and Major Twining agree that there
| will be no considerable difference in the cost of
boier-iron and cast-irOn pipes and that the cast
| iron is better and much more durable They
therefore recommend the use of cast-iron mains,
and Major Twiping estimates the cost of ex-
tending the conduit to the point near 10th and
| Boundary streets with the necessary cast-rOn
main connections. as follows
Extension of conduit Original esti-
Land damages. ................... 1895 90
Making ACKNOWLEDGEMENTS. 5S3, 1873 81
Add l0 per cent. -................. 53,3l3 SO
Total cost of conduit to that point. $50, 452 SO
Main connections from that point III, 400 co
| iotai COSt. 0I,SO6 u
Major Twning recommends the extension OF
conduit to point on the high grounds north
of and near 9th street extended, and the con-
struction OF reservoir of large capacity at that
| point. TO be connected by 4-foOt main along
New Jersey avenue with the principal mains
4 ltai.x