Drainage area at dam site-square miles
1,040
Estimated minimum discharge (25Aug 1925)-cfs
119
Minimum mean monthly flow (Sep 1925)-cfs
263
Average annual flow(1903-1959)-cfs
202
Discharge at bankfull stage-cfs
10,000
Maximum mean monthly flow (Dec 1932)-cfs
8,590
Maximum recorded discharge (8 Jan 1946)-cfs
55,000
National Weather Service 72-hour storm at Long.
85*47' Lat. 35*34'
Total rainfall-inches
30.67
Initial loss-inches
0.00
Average infiltration rate-inches per hour
0.04
Total storm runoff-inches
28.52
Total volume of storm runoff-acre feet
1,581,600
Peak rates of flow
Inflow to full reservoir-cfs
581,300
Total reservoir outflow-cfs
40,400
Spillway discharge-cfs
28,400
Duration of flood-days
5
Pool Elevations-feet msl
Maximum pool, spillway design flood
1,100
Top of flood control pool
1,085
Top of conservation pool
1,071
Minimum conservation pool
1,035
Streambed (Bottom of Flood Control Sluice)
919
Storage volumes-acre feet
Maximum pool, spillway design flood
3,332,000
Total storage-elev. 1,085
2,554,000
Flood control storage, elev 1,085 to 1,070(11.48")
637,000
Conservation storage, elev 1,070 to 1,035(18.91")
1,049,400
Dead storage, below elev 1,035
867,600
Reservoir areas-acres
Maximum pool, spillway design flood
62,900
Top of flood control pool, elev 1,085
47,182
Top of conservation pool, elev 1,070
38,024
Top of dead storage, elev 1,035
22,442
Area within taking line-acres
Purchased in fee simple
56,155
Right to inundate acquired by easement
719
River bed
1,133
Total
58,007
Length of shore line-miles
Top of flood control pool, elev
1,085 760
Top of conservation pool, elev
1,070 540
Length of reservoir at elevation 1,070-river miles
Chattahoochee River
44
Chestatee River
19
Type Rolled-fill earth
Length along crest of main dam-feet
1,630
Top Width-feet
40
Base width-feet
1,000
Height of main dam above river bed-feet
192
Total length of saddle dikes-feet
6,600
Elevation, top of dam and saddle dikes-feet msl
1,106
Type Uncontrolled chute
Width of chute-feet
100
Crest elevation-feet msl
1,085
Number of sluices
1
Diameter-feet
13.25
Discharge capacity at elev. 1,085-cfs
11,590
Discharge capacity at elev. 1,070-cfs
11,030
Discharge capacity at elev. 1,035-cfs
10,080
Discharge capacity at elev. 919(Invert)-cfs
0
Size of building
Length-feet
205
Width-feet
94.5
Type-Indoor, reinforced concrete and structural steel
const.
Elevation-feet msl
Bottom of substructure
885
Low point of draft tube
888
Centerline of distributer, 40,000 kw units
927
Centerline of distributer, 6,000 kw units
922.5
Generating units-kw
6,000 40,000
Number of units
1 2
Speed of 16,000 and 2 40,000 kw units, rpm
277 100
Spacing between 2 40,000 kw units centers,
feet
62
Turbines
Type-Francis
Rotation
counterclock clock
Guaranteed capacity-best gate,
136-foot net head-hp
8,400 55,000
Generators
Rated capacity, continuous, 60* C rise-kva
6,667 44,444
Guaranteed capacity continuous, 80'
C rise-kva 7,667 51,111
Power factor
0.90 0.90
Voltage
13,800 13,800
Date of Initial Service
7/26/57 10/10/57
6/19/57
Drawdown for storage-feet
35
Volume in power storage (elev. 1,035-1,670)-acre
feet 1,049,400
Rated net head, feet
136
Tailwater elevations, feet msl
Maximum, all units at full gate-outflow 12,000cfs
927
Flood Control Sluice-outflow 10,650cfs
926
Normal, 3 units operating-outflow 8,200cfs
924
Normal, 2 large units operating-outflow 8,000cfs
923
Normal, 1 large unit operating-outflow 3,800cfs
920
Minimum-no flow
914
Plant output
Dependable capacity-kw
73,000