Evening star. [volume] (Washington, D.C.) 1854-1972, 1895-12-16
WASHINGTON AQUEDUCT
Major Davis Report on the Progress of
Work During November.
Raising of the Dam at Great Falls is
Being COntinued-Cleanin Out
the Conduit.

In his last report in regard to the Wash
ington aqueduct, Maj. Davis, the engineer
officer in charge, says that the height of
water on the gauge at Great Falls varied
during the month between 1850 to 14S.GO,
and that the condition of the water as re-
CARDS clearness was excellent. The record
ed condition of the water both at Great
Falls and at the entrance to the mains was
36 for the entire month. The numbers from
22 to sc mean clear water. A. screen las
been put in place at the mouth of the con-
duit at Great Falls. The works of improve
ment Of the Dalecarlia reservoir having
Eeen completed by Col Geo. H. Elliot, corps
of engineers, have been turned over to the
officer in charge of the Washington aque-
duct, as part of the aqueduct system.
Most of the stone previously stripped at
SeAeca Rave been quarried, the greater
part of the work done there during the
month consisted of stripping. So far, $50
cubic yards of cut stone nave been quar-
ried. leaving 1913 cubic yards yet to be
qUarried; 40 cubic yards of cut stone have
been laid. leaving 1,2TS cubic yards still to
be laid; seventeen cubic yards of coping
have been quarried out of an estimated re-
qu:rement of 100 cubic yards; $50 cubic
yards of coping have been reset leaving
1.O9S cubic yards yet to be so treated; 1913
cubic yards of concrete have been put in
place, leaving BOT cubic lyards TO be done:
SD cubic yards of rip-ap have been put in
place. leaving 1.121 still to be put in place
Work So Far Accomplish
At the close Of the month the dam had been
raised to reference sos feet for distance of
653 feet. and to reference 149 % feet for an
additional distance of nineteen feet. The
suspension galloway across the Maryland
channel, built by r. H. Hood of Washing
ton. was tested during the month with a
load of 1852 pounds, which was raised at
the rate of 267 feet per minute, and con-
veyed at the rate Of 500 feet per minute
After some minor changes had been made,
tie galloway was accepted and paid for.
Major Davis says that work on the dam
and at the quarry will be suspended for the
winter in few days.
Cleaning the Conduit.
BY act approved March 9, 1895, $4,000
were appropriated for removing the ac-
cumulation of deposits in the conduit.
From the nature of the material it was
found impossible TO clean the conduit prop
erly by sluicing. as provided in the project,
and the work is now done by loading this
material into tubs and wheeling it to the
nearest manhole, where it is hoisted to the
surface
For the purpose of removing deposits the
water was shut off on November and 10,
and turned on again in each case forty
eight hours later. the fall in the distribut-
feet and $50 feet, respectively
On the Great Falls division much less
sediment was encountered than was antici-
pated. The total distance cleaned on this
division during the month was 1896 feet:
the amount Of sediment removed was 362
cubic yards: the area of the maximum
cross-section of this sediment was 4.3 square
feet, and the mean cross-section was 1.16
square feet.
On the Dalecarlia division the sediment in
creased in quantity above manhole t3.
The total distance cleaned on this division
during the month was 1,6SO feet; the amount
OF sediment removed was 51G cubic yards;
the area of the maximum cross-section of
this sediment was 1886 square feet and the
mean cross-section was $50 square feet.
The total distance cleaned on both
divisions was 1O,O75 feet, and the total
amount of sediment removed was S7S cubic
yards.
The total length of conduit yet to be
cleaned Is five miles.
1t Is proposed to continue the work of
cleaning out the conduit whenever the stage
of water at the distributing reservoir per-
mitS.