Item No.
Requirement
Complication
b.
Powerplant at maximum, normal, and minimum
b.
NI.
pool elevations.
23
Give the following data for the spillway:
a. Type and location. (Indicate whether uncon-
a.
Ogee type spillway with crest gates con-
trolled, movable crest, or siphon type and whether
structed across original river channel.
located in center of dam, on right or left abut-
sent, on side channel, and so on.)
b. Crest elevation.
b.
378 ft.
c. Total length including piers.
c.
1037.5 ft.
d. Number and size of piers.
d.
21-7.5 ft.
e. Clear length or total length minus total width of
e.
880 ft.
piers.
24
Give the following data for each type of spillway gate.
a. Number and type. (Indicate whether gates are
a. 22 structural steel, vertical-lift, roller
radial vertical lift, drum, roller, and so on.)
gates; roller bearings for wheels of
bottom section, bronze-bushed bearings
for wheels of top section, rubber side and
bottom seals.
b.
Means used to operate gates (gantry crane, chain
b. Gates operated by 2 traveling gantry
lift, and so on).
cranes with movable trolley; trash hoist
on right (north) crane only; gate lifting
beam on both cranes.
c.
Time required to open one gate.
c. NI.
d.
Time required to open all gates.
d. NI.
e.
Sill elevation.
e. 378 ft.
f.
Size.
f. 40 x 40 ft.
g.
Elevation, top of gates in open position.
g. 435.17 ft (top of gate dogs).
h.
Elevation, top of gates in closed position.
h. 418 ft (top of gate dogs).
i.
Total discharge capacity of one spillway gate
i. NI.
and corresponding reservoir water-surface ele-
vation.
25
Total discharge capacity of entire spillway and the
corresponding reservoir water-surface elevation.
750,000 cu ft/sec at elev 430 ft.
650,000 cu ft/sec at elev 418 ft.
460,000 cu ft/see at elev 408 ft.
26
Give tailwater elevations (elevations of the water
surface in the stream or basin at the foot of the
dam) for:
a. Maximum design flood.
a. 416 ft.
b. Maximum flood of record.
b. 403 ft.
c. Normal outflow.
c. 358.5 ft.
d. Minimum outflow.
d. 351 ft.
27
Drainage area of watershed above dam.
32,870 sq mi.
28
Give the following storage and elevation data for the
reservoir:
a. Total gross storage at maximum design reser-
a.
1,187,000 acre-feet at elev 420 (max de-
voir pool and corresponding reservoir-surface
sign pool: elev 430).
elevation.
b. Unobtainable or dead storage. (This refers to
b.
72,000 acre-feet at elev 378.
the volume of water stored at the elevation of
the entrance sill of the lowest outlet as indi-
cated in item 20e.)
c. Storage volume at maximum operating pool and
c.
1,091,000 acre-feet at elev 418.
correponding reservoir surface elevation.
d. Storage volume at normal operating pool and
d.
912,000 acre-feet at elev 414 (normal
corresponding reservoir-surface elevation.
high water: elev 413).
c. Storage volume at minimum operating pool and
e.
673,000 acre-feet at elev 408.
corresponding reservoir-surface elevation
f. Flood control storage and the corresponding
f.
418,000 acre-feet (controlled), elev 408-
reservoir surface elevations between which the
418.
storage space is reserved for flood control.
AGO 3898A
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