Evening capital and Maryland gazette. (Annapolis, Md.) 1910-1922, 1920-08-18
INCREASED RESOURCES


miles west of Annapolis, which
discharges into Broad Creek.
tributary OF South River. Three
comparatively small reservoirs
have been constructed in the val
ley of this stream short distance
north of the public road leading
from Annapolis to Chesterfield.
Two of these reservoirs are used
as impounding reservoirs, while
the third, connected with me first
two by suitable pipes and valves,
serves as a clear water basin. The
combined capacity of the three
reservoirs is approxim a.ely 45,-
100000 gallons.
No records OF the run-off from
this stream have been kept, ex-
cept such as are indirectly furn-
ished by the pumping records, and
the statements showing the neees-
sity for use of deep well water at
certain times We arc, therefore,
compelled to supplement this in
formation and compare this
stream with other similar streams
from which a series Of gagings
covering long period are avail
able, and thus arrive at an esti-
mate of the yield of this water
she'd
From such studies we learn that
the minimum flow from the
stream in the dryest years is
probably not more than 015 cubic
foot per second per square mile,
or for the entire drainage area IN
question of 345 square miles, it
would be 334.50O gallons per "a
bours.
The average daily yield for the
entire year in the dryest years is
about 079 C. I. s. per square mi;e,
or 100000 gallons per "a hours.
The maximum average daily
run-off for any month at any time
is about 5.22 C. f. 5. per square
mile. which is equal to ll.600.000
gallons per "a hours. This. how
ever, is very rarely reached.
These figures SHOW cenclusively
THAT at no time up TO the present
would there have been any diff
Guilty in furnishing All ample sup
ply of water to Annapolis even in
the dryest years, had Sufficient
storage been provided in the val
ley of the stream.
Storage Reservoirs
We have made careful study
of the stream valley with special
reference to sites for larger stor-
age reservoirs The most favor
able location for dam is along
the south side of the present
main dam at the clear water res
ervoir. At this point all the wa
ter from the several brdlches
forming the stream can be inn
pounded in one large reservoir,
while to go up tho stream would
require two dams te accomplish
the same purpose ana their COM
bined length would be about l "a
times as great, with nearly the
same total height. 1t is also pos
sible to utilize the existing dam
at the lower location, which will
result in a considerable saving in
cost, as nearly one-third off the
total required embankment is&al-
ready in place and the new con-
struction work can be carried on
with a minimum amount of dis
turbance to the stored water or
interference with the normal OPP
erations of the pumping plant.
Locating the dam at this point
also automatically gives the re-
quired head necessary for the
proper operation of any purifica-
ton works which may be in
stalled.
The impounding feservoi
should have an available capacity
of 400, 600. 900 gallons To do this,
as nearly as we can determine
from the small scale maps avail
able, will require a dam which
will impound the water to eleva-
ton $50, which is II ga feet
higher than the crest of the spill
way of the present clear water
reservoir. The surface area 'of
this reservoir would be about 160
acres. The exact elevations and
capacities can only be determined
after accurate surveys have been
made, but we feel that these fig
ures are close approximations.
which may be a little high rather
than low.
With a storage reservoir such
as above outlined, the minimum
daily yield during the dryest
years, such as occurred during
1910 and 1911 and during 1914,
would be theoretically 1890 coo
gallons Making alloNaIce for
evaporation and seepage, the safe
yield should be about 1000, goo
gallons of water per dey.
A mass diagram of the flow Of
this stream. based on the flow of
other Maryland streams, has been
constructed and is included i'm this
report. The above figures OF safe