View
221
Download
0
Embed Size (px)
Citation preview
US Army Corps of Engineers
BUILDING STRONG®
USACE – ACF Operations
Bailey CraneWater ManagementUSACE, Mobile District
BUILDING STRONG®
BUILDING STRONG®
Mobile District Basins
BUILDING STRONG®
Conduct water management activities for Corps reservoirs
Supervise flood control Technical assistance Exchange data with National
Weather Service and provide information to District elements
Operation of rainfall and river reporting network
Maintain project data Preparation/revision of water
control manuals Develop hydrologic models
Water Management – USACE Perspective
BUILDING STRONG®
Water Management Staff
Supervisory Hydraulic Engineer
4 Hydraulic Engineers
1 Engineer Interns
1 Hydrologic Technician
Office staffed 365 days/year (limited hours on weekends)
BUILDING STRONG®6
Lake Lanier
West Point Lake
Walter F. George Lake
Andrews L&D
Lake Seminole/Woodruff Dam
Flint River
Chattahoochee River
Apalachicola River
The ACF Basin
Buford Dam and Lake Sidney Lanier
BUILDING STRONG®
Recreation
Water Quality
Hydropower
Navigation
Project Purposes and Demands
Municipal &Industrial
Environmental
BUILDING STRONG®
ACF Major Water Users
BUILDING STRONG®
Minimum Flows on the ACF
5000 cfsApalachicola R. at
Chattahoochee
750 cfsat Peachtree Ck
670 cfsbelow West Point
• Lanier and West Point have instantaneous flow requirements; Jim Woodruff has a daily average flow requirement
• Peachtree Creek
• Minimum flow below Jim Woodruff varies with RIOP rules
BUILDING STRONG®
ACF BasinACF BasinBasin Storage
When Full:
62.5% - Lake Lanier
17.6% - West Point
14% - W. F. George
ACF StorageACF Storage
BUILDING STRONG®
ACF Drainage AreaACF Drainage Area Lanier1040 Miles2
West Point2210 Miles2
WF George4080 Miles2
Jim Woodruff9770 Miles2
Only 6% of Drainage Area!
BUILDING STRONG®
What Does This Mean?
ReFill Rate Compared to Lanier
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Rat
io t
o L
anie
r
Series1 1.0 3.5 3.2 7.5
Lake Lanier West Point W.F. George Lake Seminole
100 MW
West Point and WF GeorgeWill fill 3 ½ time faster than Lanier
If the reservoirs did not release a drop of Water
BUILDING STRONG®
Current System Drivers
“Balanced System” Operations
State water quality flow requirement near Peachtree Creek on Chattahoochee River
Revised Interim Operating Plan (RIOP)
BUILDING STRONG®
State Water Quality Requirement
State Water Quality Requirement
1,100- 1,500 cfs minimum release to meet Metro-Atlanta 750/650-cfs WQ
flow
BUILDING STRONG®
Revised Interim Operating Plan Dictates operations based on basin inflow and
releases from Jim Woodruff Dam
Year-round operations to support flow needs for sturgeon spawning, young sturgeon, mussels, and host fish for mussels
Minimize or avoid impacts of low flow operations on listed species or critical habitat
Provide for storage when water is more plentiful to allow for future augmentation during low flows in support of mussels
Minimize impact to other project purposes
BUILDING STRONG®
RIOP Operations-Release Decision Matrix
BUILDING STRONG®
How Did We Get Here?
BUILDING STRONG®
BUILDING STRONG®
BUILDING STRONG®
BUILDING STRONG®
Historic Low Flows on the Flint
Most flows below the 10th percentile during late August and September
Daily record lows at numerous gages on many days
BUILDING STRONG®
Woodruff Discharge vs Basin Inflow
Woodruff Discharge
7 Day Basin Inflow
5,000 CFS Minimum Release
Flow supplemented with storage
BUILDING STRONG®
Forecasting Lake LevelsQPF’s
CPC Precip Outlooks
SERFC River Forecasts
BUILDING STRONG®
Forecasting Lake Levels
Short term forecasts use QPF’s and river flow forecasts NWS, SERFC
Long term forecast based on predicted climate conditions and forecasted percent of normal rainfall Climate Prediction Center
Flood forecasts use QPF’s, river flow forecasts, and data collected by project personnel.
BUILDING STRONG®
Lake Lanier► Authorized by PL 79-525► Completed 1957► Authorized Project Purposes
Flood Control Hydropower
Water Quality Water Supply
Recreation Navigation
Fish & Wildlife
Top of Flood Pool Elev 1085
Top of Conservation (summer) Elev 1071
Top of Conservation (winter) Elev 1070
Current Pool Elev 1058.3
Feet Below Full (Winter Pool) 11.7 ft
Plant Capacity 127 MW
BUILDING STRONG®
Lake Lanier-5 Week Forecast
1035.00
1040.00
1045.00
1050.00
1055.00
1060.00
1065.00
1070.00
1075.00 Lanier Action Zones and Actual 2011 Elevations
Top of Conservation
Zone 1
Zone 2
Zone 3
Zone 4
Bottom of Conservation
Elevation in FT NGVD
1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec
Record Low Elevations 1960-2010
Actual data thru November 28, 2011
2011 Actual Elevation Forecast Elevation Historical Average Elevation Record Low Elevation (1960-2010)
BUILDING STRONG®
► Authorized by PL 87-874► Completed 1975► Authorized Project Purposes
Flood Control Hydro Power
Recreation Water Quality
Navigation Fish/Wildlife
Top of Flood Pool Elev 641
Top of Gates (closed) Elev 638
Top of Conservation (summer) Elev 635
Top of Conservation (winter) Elev 628
Current Pool Elev 623.0
Feet Below Full (Winter Pool) 5 feet
Plant Capacity 87 MW
West Point
BUILDING STRONG®
West Point-5 Week Forecast
620.00
622.00
624.00
626.00
628.00
630.00
632.00
634.00
636.00
638.00
640.00West Point Action Zones and Actual 2011 ElevationsElevation in FT MSL
Top of Conserva-tion
Zone 1
Zone 2
Zone 3
Zone 4
Bottom of Conservation
1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec
Actual data thru November 28, 2011
2011 Actual Elevation Forecast Elevation Historical Average Elevation
BUILDING STRONG®
► Authorized by PL 79-525► Completed 1963► Authorized Project Purposes
Hydro Power Water Quality
Recreation Fish/Wildlife
Navigation
Top of Flood Pool NA
Top of Gates (closed) Elev 192
Top of Conservation (summer) Elev 190
Top of Conservation (winter) Elev 188
Current Pool Elev 184.8
Feet Below Full (Winter Pool) 3.3 ft
Plant Capacity 162 MW
Walter F. George
BUILDING STRONG®
Walter F. George-5 Week Forecast
184.00
185.00
186.00
187.00
188.00
189.00
190.00
191.00
192.00W.F. George Action Zones and Actual 2011 ElevationsElevation in FT MSL
Zone 1
Zone 2
Zone 3
Zone 4
1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec
Bottom of Con-servation
Top of Conservation
Actual data thru November 28, 2011
2011 Actual Elevation Forecast Elevation Historical Average Elevation
BUILDING STRONG®
1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec -
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
2011 ACF Basin Composite Conservation & Flood Storage
Co
mp
osi
te C
on
serv
atio
n &
Flo
od
Sto
rag
e, (
ac-f
t)
Top of Conservation
Drought Zone
Composite Zone 3
Composite Zone 2
Composite Zone 1
Composite Zone 4
Actual data through 11-28-2011
George ConservationWest Point ConservationLake Lanier Conservation
George Flood StorageWest Point Flood StorageLake Lanier Flood Storage
Add value of 1,856,000 acre-ft to include inactive storage.
Remaining Composite Storage in the ACF
5 Week Forecast
BUILDING STRONG®
Long-Term Outlook
BUILDING STRONG®
3 Month Precipitation Outlook
BUILDING STRONG®
Long-Term Forecasts
Developed using ACF ResSim Baseline Model
Based on percentile flows of entire period of record
BUILDING STRONG®
Lake Lanier – 3 Month Forecast
2011 Observed Elevations10th Percentile Hydrology25th Percentile Hydrology50th Percentile Hydrology
Top of Conservation
BUILDING STRONG®
West Point -3 Month Forecast
2011 Observed Elevations10th Percentile Hydrology25th Percentile Hydrology50th Percentile Hydrology
Top of Conservation
BUILDING STRONG®
Walter F. George - 3 Month Forecast
2011 Observed Elevations10th Percentile Hydrology25th Percentile Hydrology50th Percentile Hydrology
Top of Conservation
BUILDING STRONG®
Summary
Conditions for the upcoming fall and spring are forecast to be drier than normal as La Nina conditions persist
Full refill of storage projects on the ACF is unlikely for the upcoming year
The Corps will take advantage of opportunities to store water while meeting basin-wide needs and project purposes