the 2019 flood€¦ · the 2019 flood a presentation given to the oklahoma floodplain managers...
TRANSCRIPT
THE 2019 FLOODA Presentation Given to the Oklahoma Floodplain Managers Association
September 16, 2019
IT HAS CONTRUBUTING AREA OF 23,000 SQUARE MILES.IT IS A MULTI-PURPOSE PROJECT.CONSTRUCTION WAS COMPLETED IN SEPTEMBER 1964.
A QUICK LOOK AT KEYSTONE DAM…
THE FLOOD OF RECORD OCCURRED IN OCTOBER 1986.
THIRTY (30) FLOOD-CONTROL RESERVOIRS IN ARKANSAS RIVER WATERSHED IN OKLAHOMA AND KANSAS.
THE LOWER 13 RESERVOIRS HAVE 7.6M TOTAL ACRE-FEET OF FLOOD-CONTROL STORAGE.
THERE IS AN UNCONTROLLED AREA OF 7,200 SQ. MI. BELOW THE RESERVOIRS.
A SYSTEM APPROACH…
UPPER ARKANSASVERDIGRIS NEOSHO /
GRAND
LOWER ARKANSAS
TULSA
DOWNSTREAM REGULATION IS BASED ON THE PERCENTAGE OF STORAGE UTILIZED IN THE BASIN.
THE REGULATING STAGE AT VAN BUREN EQUATES TO 150,000 CFS.
WHEN RESERVOIRS EXCEED FLOOD-CONTROL CAPACITY, RELEASES ARE NOT BASED ON THE SYSTEM.
DOWNSTREAM REGULATION
AN ADDITIONAL 550,000 ACRE-FEET OF STORAGE BECOMES AVAILABLE AS THE GATES ARE RAISED TO EL. 757.
ANATOMY OF KEYSTONE DAM…
WHAT IS SURCHARGE?
6X LARGER THAN AVAILABLE VOLUME
TOTAL INFLOW: 8.3M ACRE-FEET
1.3M ACRE-FEET FLOOD-CONTROL STORAGE
0.4M ACRE-FEET CONSERVATION STORAGE
INITIAL RAINFALL –FLOOD-CONTROL POOL BEGINS TO FILL
SYSTEM BALANCING – RELEASES INCREASED TO 100,000 CFS
DOWNSTREAM PRIORITY – RELEASES SCALED BACK; FLOOD POOL DROPPING
ADDITIONAL RAINFALL – FLOOD POOL FORECAST TO COMPLETELY FILL; RELEASES INCREASE
SURCHARGE OPERATION – 275,000 CFS PEAK RELEASE; DEVIATION APPROVED
DRAWDOWN BEGINS
14.5” BASIN AVERAGE RAINFALL
KEYSTONE DAM
2019 QUICK FACTS
+ LARGEST FLOOD ON RECORD+ RECORD POOL ELEVATION+ SECOND LARGEST RELEASE ON RECORD+ LONG DURATION
720
725
730
735
740
745
750
755
760
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
5/1 5/8 5/15 5/22 5/29
POO
L EL
EVAT
ION
(FT)
FLO
W (C
FS)
DATE
INFLOW OUTFLOW POOL ELEVATION
12
3
45
6
322,000 CFS PEAK INFLOW
LARGEST RELEASE SINCE 1998
RECORD POOL
LARGEST RELEASE SINCE 1986
1
2
3
4
5
6
200,000
250,000
300,000
350,000
5/23 5/24 5/25 5/26 5/27 5/28 5/29
FLO
W (C
FS)
DATE INFLOW OUTFLOW
KEYSTONE IMPACTS…
275,000 CFS PEAK OUTFLOW
322,000 CFS PEAK INFLOW
IT IS IMPORTANT TO REMEMBER THAT FLOOD-CONTROL DAMS ARE DESIGNED TO REDUCETHE DOWNSTREAM IMPACTS FROM FLOODING, BUT THEY DO NOT ELIMINATE FLOOD RISK!
WITHOUT KEYSTONE AND KAW DAMS, THE FLOW ALONG THE ARKANSAS RIVER WOULD HAVE BEEN 375,000 CFS!
0
200,000
400,000
600,000
FLO
W (C
FS)
Keystone Releases
Arkansas River at Van Buren
720
730
740
750
760
0 20 40 60 80 100 120
POO
L EL
(FT)
DAY (BEGINNING MAY 1)
Keystone Pool Elevation
12
34
1
2
3
4
SYSTEM OPERATION DURING INITIAL FLOOD – 150,000 CFS @ VAN BUREN
SURCHARGE(NO LONGER A SYSTEM OPERATION)
BACK TO A SYSTEM OPERATION (< 40% STORAGE) – 150,000 CFS @ VAN BUREN
SYSTEM OPERATION (< 20% STORAGE) –60,000 CFS @ VAN BUREN
SYSTEM IMPACTS…
ARKANSAS RIVER BASIN
MAY 9 MAY 29
AN ADDITIONAL 1.2M AC-FT IN STORAGE…
VERDIGRIS RIVER BASIN
MAY 9 MAY 29
AN ADDITIONAL 1.3M AC-FT IN STORAGE…
VERDIGRIS RIVER
THIRD LARGEST CREST ON RECORD ALONG CANEY RIVER @ COLLINSVILLE.
A PEAK RELEASE OF 65,000 CFS FROM OOLOGAH DAM; MAXIMUM FLOW OF 95,000 CFS @ CLAREMORE.
FOURTH LARGEST CREST ON RECORD ALONG BIRD CREEK @ SPERRY, OWASSO.
NEOSHO / GRAND RIVER BASIN
MAY 9 MAY 29
AN ADDITIONAL 1.0M AC-FT IN STORAGE…
NEOSHO / GRAND RIVER
MAJOR FLOODING IN MIAMI…
A PEAK RELEASE OF 180,000 CFS FROM PENSACOLA DAM AND 225,000 CFS FROM FORT GIBSON DAM.
FIFTH LARGEST CREST ON RECORD ALONG NEOSHO RIVER @ COMMERCE.
…DOWNSTREAM ALONG THE ARKANSAS…
FLOOD OF RECORD @ VAN BUREN, AR (40.79’).
THE PEAK FLOW AT MUSKOGEE WAS 600,000 CFS; UNREGULATED FLOWS WOULD HAVE BEEN SIGNIFICANTLY HIGHER…
SECOND LARGEST CREST ON RECORD ALONG ARKANSAS RIVER @ MUSKOGEE (46.39’).
CATASTROPHIC FLOODING AT MOFFETT, WEBBERS FALLS.
…AND BEYOND…
SIGNIFICANT IMPACTS WERE ALSON OBSERVED IN ARKANSAS
