Evening star. [volume] (Washington, D.C.) 1854-1972, 1879-07-28


From p. m. to p. p.m.................3,3 m. ,327, 1852
From p. m. to midnight. ht........... 1922, ,14
From midnight to a. m. 24,92s
From a. m. to p. m................3,17 m. B, lis, ,249
Total quantity In "a hours. 5947,6l2
The experience OF the past few years has
shown that
THE DISTRIBUTING RESERVOIR IS ENTIRELY TOO
for the purpose for which it was built: which
was to afford the Potomac water ample time to
deposit its sediment before entering the iron
mains II the Potomac is turbid at the head of
the aqueduct it must, unless shut off, soon dis
place the clear water in the reservoir; and If 1t
Wo m oe on 1or Ve Gays the
always have clear water In the mains, the area
OF the distributing reservoir should be enlarged.
the Seonsumptlon Of water is yearly Increasing
that can be supplied by the present system OF
iron mains. From II ,554, ,S4S gallons In 1874 the
25, ,947, ,642 tn 1879
TO INCREASE THE SUPPLY SPEEDILY AND ECO
NOMICALLY,
it Is recommended that another main be laid
from the distributing reservoir to Capitol HILL
1t should be three feet in diameter and located
on route to be determined by a careful sur
vey. 1t should be connected with the present
system of pipes only on Capitol Hill and other
points Of equal or higher altitude. 1t would
convey to Capitol Hill at an elevation OF 115
feet 12,O0O,00O gallons In "a hours. The furnish
ing OF the additional amount OF water In this
GtouuCl WOOiO iCulcI CUc CUuplcltOu VI Iuc
Potomac dam at the Great Falls necessity.
This dam is built only across the Maryland
channel OF the Potomac, and for several years
past the consumption OF water has exceeded
the minimum flow OF the Maryland channel.
During the season OF drought the supply
OF water to Washington cannot be ma
terially increased until the dam is COM
pleted or extended, so as to raise the sur
face OF the water at the head OF the aqueduct.
The conduit OF the Washington Aqueduct from
the Great Falls to the distributing reservoir Is
60.922 feet long and feet In diameter. It's
charge when running full is g. 259 500 gallons In
"a hours. Its minimum discharge is 81, ,s32, ,464.
The discarge might be increased eighty million
gallons In "a hours by completing the Potomac
dam to feet above its present height and lower
the surface OF the water In the reservoir to
~ feet, but the conduit would be run under
head at Its upper end and would It is feared
render the strengthening of its embankmentS
and modification OF its water weirs and bridges
necessity. Col. Casey submits the following
ESTIMATES FOR APPROPRIATIONS
for the next fiscal year:-Engineering r1ainte
nance and general repairs. $4,000; commencing
the construction of dam at Great Falls across
the virginia channel OF the Potomac, $5O, 600
for improving grounds at receiving reservoir
81 GOO; building wooden fence around govern
ment land at receiving reservoir, ST, 600; sod
ding at receiving reservoir and on conduit,
$1,000; building bridge over waste channel a.
distributing reservoir, 81 900; building an over
1ali over connecting conduit for waste channe.
OF receiving reservoir, $4,000; and for conttnu-
ing macadamizing Of the conduit road, $4,000.
During the year the water at the distributing
reservoir was clear 1875 days, slightly turbid 8;
days, turbtd "a days and very turbid 80 days
slightly turbid 81 days, turbid II days and very
tUrbtd 120 days.