Dam site, river miles above mouth of Apalachicola
River 107.6
Drainage area George W. Andrews Lock and Dam to Jim
Woodruff, square miles
9,107
Total drainage area above Jim Woodruff Lock and Dam,
square miles
17,230
Period of continuous record
1929-1971
Average annual flow for period of record, cfs
21,311
Minimum monthly flow for period of record
(Oct. 1954), cfs
5,340
Minimum 7-day flow for period of record, cfs 5,150
Minimum mean daily flow of record, cfs
Inflow (Oct. 27, 1968), regulated
2,760
Outflow (Sept. 10, 1957), regulated
4,540
Maximum monthly flow for period of record,
(Mar. 1929), cfs
172,000
Maximum flow during period of record,
(Mar. 20, 1929), cfs
293,000
Discharge at bankfull, cfs
77,000
Maximum flood of record (Y-arch-April 1929)
Regulated peak outflow, cfs
285,500
Regulated peak headwater, feet above msl
82.34
Peak tailwater elevation, feet above msl
80.40
Spillway design flood
Peak inflow to full reservoir, cfs
781,100
Regulated peak outflow, cfs
690,700
Regulated peak headwater, feet above msl
96.73
Peak tailwater elevation, feet above msl
96.10
Standard project flood
Peak inflow to full reservoir, cfs
411,900
Regulated peak outflow, cfs
377,900
Regulated peak headwater, feet above msl
86.39
Peak tailwater elevation, feet above msl
84.95
Total rainfall, inches, spillway design flood
Chattahoochee basin
14.2
Flint basin
13.4
Entire basin above dam
13.8
|
|
|
|
|
|
|
| Pool begins to rise above normal due to flood inflows | 203,600 | 75.3 | 77.0 | 1.70 | 25 |
| Flow begins over fixed-crest spillway |
|
77.1 | 79.0 | 1.90 | 47 |
| Flow begins over lock | 278,000 | 80.0 | 82.0 | 2.00 | Over 100 |
| Maximum flood of record | 285,500 | 80.4 | 82.34 | 1.96 | Over 100 |
| Flow begins over dike | 345,000 | 83.3 | 85.0 | 1.70 | Over 100 |
| Flow begins over saddle, right bank | 519,000 | 90.1 | 91.0 | 0.90 | Over 1,000 |
| Spillway-design flood | 690,700 | 96.73 | 96.1 | 0.63 | Over 1,000 |
Normal pool elevation, feet above msl
77.0
Area at pool elevation 77.0, acres
37,500
Area acquired in fee simple, acres
60,072
Area acquired by easement with right to inundate,
acres 6,516
Area in river bed, acres
4,000
Total area within taking line, acres
70,588
Total volume at elevation 77.0, acre-feet
367,320
Length at elevation 77.0, river miles
Flint River
47
Chattahoochee River to George W. Andrews Lock
and Dam 46.7
Nominal size of chamber, feet
82 x 450
Distance center to center of gate pintles, feet
505
Maximum lift, feet
33
Elevation of upper miter sill, feet above msl
54'.0
Elevation of lower miter sill, feet above msl
30.0
Elevation of top of lock walls, feet above msl
82.0
Elevation of top of guide walls, feet above ms1
82.0
Elevation of top of guard walls, feet above msl
82.0
Freeboard on upper guide and guard walls when
lock becomes inoperative, feet
1.0
Freeboard on lower guide and guard walls when
lock becomes inoperative, feet
2.8
Percent of time lock is inoperative
0.1
Height of upper gate
28' 4"
Height of lower gate
52' 4"
Width of upper gate
46' 8 5/16"
Width of lower gate
46' 8 7/8"
Size of culvert at valves, feet
10 x 10
Depth of submergence of valves by lower pool, feet
7.0
Type of emergency dams
Stop-log
Type of operating machinery
Hydraulic
Swellhead when lock is over topped, feet
2.0
1.5-minute valve-opening time
Total time required to fill lock
chamber, starting with
valves closed, min.
6.31
Maximum rate of rise, fpm
10.25
Maximum flow into chamber, cfs
7,010
Filling coefficient
0.88
6-minute valve-opening time
Total time required to fill lock
chamber, starting with
valves closed, min.
8.58
Maximum rate of rise, fpm
6.23
Maximum flow into chamber, cfs
4,260
Filling coefficient
0.88
6-minute valve-opening time
Total time required to empty lock
chamber, starting
with valves closed,
min.
9.52
Maximum rate of fall, fpm
5.75
Maximum flow from chamber, cfs
3,930
Emptying coefficient
0.75
Total length, including end pier, feet
766
Net length, feet
640
Elevation of crest, feet above msl
48.0
Number of piers including end pier
16
Width of piers, feet
End pier
6
Other piers
8
Height of piers above spillway crest, feet
59
Type of gates
Vertical lift (split leaf)
Number of gates
16
Length of gates, feet
40
Height of gates, feet
30.5
Weight of top leaf, lbs.
47,444
Weight of bottom leaf, lbs.
66,402
Method of operating gates
Gantry Crane
Number of gantry cranes provided
2*
Capacity of gantry crane, tons
75
Maximum discharge capacity (pool elev. 77.0), cfs
203,600
Elevation of top of gates in closed position,
feet above msl
78.5
Elevation of access bridge, feet above msl
107.0
Elevation of apron, feet above msl
20.0 (max.)
Thickness of apron, feet
3 (min.)
* One of these cranes will operate powerhouse intake gates also.
Total length, feet
1,634
Net length, feet
1,584
Elevation of crest, feet above ms1
79.0
Elevation of bucket, feet above msl
69.39
Total length (crest elevation 85.0), feet
2,130
Total length of transition (elev. 85.0 to elev. 107.0),
feet 690
Top width, feet
25
Side slopes
1 on 2.5
Slope protection
18" grouted riprap on
6" gravel base
Maximum swellhead when dike is overtopped, feet
1.8
Recurrence interval of flood which will overtop dike,
years over 100
Freeboard, top of dike above normal upper pool, feet
8
Number of units
3
Spacing of units, feet
65
Installed capacity (name plate rating), kw
30,000
Overload capacity at normal operating pool, kw
36,000
Turbine discharge at normal pool (elev. 77.0), cfs
1 unit operating
5,500
2 units operating
12,000
3 units operating
18,300
Tailwater elevations, feet above msl
Minimum of record (discharge = 6,270 cfs)(Oct.
30, 1968) 41.5
1 unit operating
41.5
2 units operating
45.3
3 units operating
48.4
Net head, full load, feet
30.5
Minimum head for generation
9
Percent of time minimum head equalled or exceeded
99.2
Powerhouse
Length, feet
258.7
Width, feet
122.0
Type of construction
Reinforced concrete
Type of turbines
Movable-blade propeller
Capacity of turbines at 75 rpm and
rated head (26.5'), hp
14,000
Elevation centerline of distributor, feet above msl
52.0
Elevation centerline of intake, feet above msl
53.5
Elevation low point of draft tube, feet above msl
4.0
Generator rating, kw (0.9 p.f., 13.8 kv, 3 phase,
60 cycles, 75 rpm)
10,000
Station auxiliary power
Source 2 taps from 13.8 kv bus
Number of 3-phase transformers
2
Rating at 13,800/48OV, kva
750
Emergency gas generator, kw 100
Type of intake gates
Double leaf, vertical lift
Number of intake gates, each unit
2 (4 leaves)
Number of intake gates provided
4 (8 leaves)
Size of intake gates
23' 9" x 30' 7"
Method of operating intake gates
75-ton gantry crane@
Type of draft tube gate
Vertical leaf (slide)
Number of draft tube gates, each unit
2 (4 leaves)
Number of draft tube gates provided
4 (8 leaves)
Method of operating draft tube gates
20-ton gantry crane
Switchyard and parking areas
Location
East of powerhouse
Elevation, feet above msl
107.0
Width of section, feet
260
Length of section, feet
491
Slope protection
18" riprap on 6" gravel base
Side slopes ground surface to elevation 85.0
1 on 4
Side slopes, elevation 85.0 to elevation 107.0
1 on 3
Drawdown for pondage (normally elev. 77.5 to 76.5),
feet
1
Volume for pondage, acre feet
37,500
Plant output, kw
Full load
36,000
Minimum generating head
6,000
Total average annual energy, kwh (excluding station
service)
238,090,000
@This crane is one of the two provided to operate spillway gates.