Before the FERC Application for New License for the Annex Creek ...

BGH ENGINEERING, INC.
11550 CALUMET AVENUE, LA JOLLA. CAUFORNIA 82037
f~~09
March 25, 1985
Mr. William A. Corbus, Manager
Alaska Electric Light , Power Co.
134 North Franklin Street
Juneau, Alaska 99801
Dear Bill,
In accordance with your request, I have made a determination
of the number of inches of rainfall on the Salmon
Creek Reservoir drainage area that would be required to
raise the reservoir water surface from Elevation 1140 to
spillway Elevation 1172. This ceterrnination is based on the
assumption that there was no outflow from the reservoir
either through the Lower Salmon Creek Powerhouse or through
the reservoir outlet valve.
Under the above assumption, I estimate that it would
take approximately 22 inches of rainfall on the Salmon
Creek Reservoir drainage area to raise the water surface
from Elevation 1140 to Elevation 1172. One inch of rainfall
would raise the level of the reservoir approximately
18 inches.
Assuming ehat Lower Salmon Creek Powerhouse is operating
at its present full capacity, the outflow through the powerhouse
is equivalent to a dxawdown of approximately 13 inches
per day while the reservoir is above Elevation 1140. Assuming
one inch of rainfall per day, the reservoir would rise
under this condition at the rate of 5 inches per day. Assuming
3 inches of rainfall per day, the rise is 40 inches per
day and for an assumption of 5 inches per day, the rise is
75 inches per day.
Should you need further information on this matter please
let me know.
Sincerely,
~
B. G. Hildyard