GEORGE W. ANDREWS LOCK & DAM
CHATTAHOOCHEE RIVER, GA & AL
PERTINENT DATA
GENERAL

Damsite, miles above mouth of Chattahoochee River                  46.5
Drainage area above damsite - square miles                        8,210
Drainage area between damsite and Walter F. George Dam -
square miles                                                        753

RESERVOIR

Length - river miles                                               28.6
Normal full pool elevation, feet, msl                               102
Peak flood for standard project flood, feet, msl                  130.2
Peak pool for spillway design flood, feet, msl                    135.5
Area at static full pool (elev. 102) - acres                      1,540
Total volume at static full pool - acre-feet                     18,180
Shore line length at static full pool - miles                        65

STREAM FLOW AT DAMSITE

Average annual flow, Jan 1929 - Dec 1971 - cfs                   10,890
Minimum mean daily, 26 Oct 1930 - cfs                             1,190
Maximum known, 18 Mar 1929 - cfs                                203,000
Bankfull (approx.) for downstream reach - cfs                    40,000
Minimum mean monthly flow, Oct 1954 - cfs                         1,370
Maximum mean monthly flow, Mar 1929 - cfs                        99,600
Standard project flood peak inflow - cfs                        293,100
Spillway design flood peak inflow - cfs                         630,000
 

TAILWATER ELEVATIONS (feet above msl)

Highest known flood (18 Mar 1929, peak discharge -
 203,000 cfs)                                                     125.8
Selected spillway discharges:
 Capacity at headwater elevation 102 (43,600 cfs)                 100.7
 Bankfull capacity for downstream reach (40,000 cfs, approx.)      99.7
Capacity at headwater elevation 96 (30,800 cfs)                    94.5
Full Walter F. George power operation, best gate, no
 reregulation (25,000 cfs, approx.)                                92.5
Peaking operation Walter F. George power plant:
 Reregulated peak discharge, 20,000 cfs                            89.2
 Reregulated peak discharge, 15,000 cfs                            85.5
 Reregulated peak discharge, 10,000 cfs                            81.8
Minimum tailwater (zero discharge)                                 77.0
 

DAM AND SPILLWAY

Total length - feet                                                 620
Fixed-crest length - feet                                           340
Fixed-crest elevation - feet, msl                                   102
Gated length - feet                                                 280
Gated crest elevation - feet, msl                                    82
Gated net length - feet                                             240
Number of piers                                                       5
Width of piers - feet                                                 8
Service bridge elevation - feet, msl                                142
Type of gates                                                   Tainter
Size of gates - feet                                            60 x 21
Top of gate elevation (closed) - feet, msl                          103
Number of gates                                                       4
Capacity of gated spillway at pool elevation 102-cfs             43,600
Capacity of gates spillway at pool elevation 96-cfs              30,800
Apron elevation                                                  Varies
Apron length below gated section - feet                              34

LOCK

Static full upper pool elevation - feet msl                         102
Normal lower pool elevation - feet, msl                              77
Maximum lift feet                                                    25
Chamber width  feet                                                  82
Nominal chamber length - feet                                       450
Distance between pintles - feet                                     505
Elevation of top of lock walls - feet, msl                          115
Elevation top of upper sill - feet, msl                              83
Elevation of top of lower sill - feet, msl                           64
Elevation of floor - feet, msl                                       60
Type of gates                                                     Miter
Height of lower gate - feet                                          51
Height of upper gate - feet                                          32
Type of valves                                                  Tainter
Culvert size - feet                                             10 x 10
Freeboard when lock becomes inoperative - feet                        1
Percent of time inoperative                                         0.4