Flood Warning and Forecasting Issues in the SRWMD.

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Presentation transcript:

Flood Warning and Forecasting Issues in the SRWMD

Suwannee River Basin Georgia Florida 240 Miles Long, 9,950 Square Miles Headwaters Okefenokee Swamp: Suwannee River Cordele, GA: Alapaha River Tifton, GA: Withlacoochee River State Line at River Mile 207 Only 43% of Basin is in Florida

Suwannee River Basin Non-Structural Floodplain Management Strategy n Floodplain Regulation n Floodplain Acquisition n Forecasting and Education

Floodplain Regulation Elevate Structures Elevate Structures n Limit Fill and Obstructions in Floodplain n Riverbank Setbacks and Erosion Control

Floodplain Acquisition Strategy n Provide natural storage for flood waters n Reduce loss of life and property due to floods n Protect ground and surface water resources n Protect natural systems associated with floodplain ecosystems

Flood Warning and Education n Emergency Management Coordination n Flood Forecast Modeling n Forecast Dissemination –Telephone –Internet –NOAA Weather Radio

Georgia Florida Flood Monitoring Network in the Suwannee River Basin USGS-GA USGS-FL SRWMD

Georgia Florida Flood Forecast Points in the Suwannee River Basin USGS-GA USGS-FL SRWMD

Automated Rainfall Network Current Station Planned Station

Major Floods in the Suwannee Basin n Earliest Documented Flood n Flood of Record on Alapaha, Withlacoochee, Suwannee below Ellaville n Hurricane Dora - Flood of Record on Santa Fe River n Flood of Record at White Springs and Suwannee Springs n Roughly a 20-year flood

Recent Flood Events on the Santa Fe n March/April Last major Suwannee flood before 1998 El Niño n 1992 – October Surprise n February/March Highest water in upper Santa Fe since 1964 n March 2003 – NWSRFS Model Tune-up

10/92 9/85 9/88 Pure Santa Fe Flood 3/91 3/98 3/86 2/91 4/84 Pure Suwannee Flood 4/91 2/98 Mixed Flood

Monitoring Goals n Obtain near-real-time river level and rainfall data for forecast model input n Improve our understanding of the interaction between ground and surface water Develop/maintain tools for evaluating changes in flow ratings in the Suwannee River Basin Develop/maintain tools for evaluating changes in flow ratings in the Suwannee River Basin

Rating Mechanics n Primarily stage versus discharge n Model mechanics n If stage-discharge relationship is unreliable, river forecast results will be unreliable.

Rain, Soil Moisture, Travel Time

Rose Creek/Walter Little Road

Vertical Datum Upgrade Issues NAVD88 is about 9 inches below NGVD29 All gages are currently in NGVD29 All modeling is currently in NGVD29 Not all surveying may be in NGVD29

Suwannee River at Dowling Park

Old Highway Bridge at Dowling Park