Applications of the Applications of the NWS FLDWAV ModelNWS FLDWAV Model

Teton Dam Failure on Teton Dam Failure on Snake RiverSnake River

Teton Dam FailureTeton Dam FailureSpecificationsSpecifications

Dam Height: 300 ftCrest Length: 3,000 ftStorage behind dam: 250,000 acre-ftDam crest width: 35 ftSlope of upstream dam face: 1:2Slope of downstream dam face: 1:2.5

Failure occurred June 6, 197611 people killed25,000 people homeless$400M damage

Peak Outflow: 1.6 – 2.8 million cfs (2.3M best estimate)Breach shape – trapezoid. Max width 500 ft; side slope 1 : 0.5Reservoir depleted in 5 hrs

Outflow Hydrograph and Flooded AreaOutflow Hydrograph and Flooded AreaDownstream of Teton DamDownstream of Teton Dam

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TIME (HR)

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Teton Dam FailureTeton Dam Failure

Susquehanna River SystemSusquehanna River System

Susquehanna River SystemSusquehanna River System

Lower Mississippi River SystemLower Mississippi River System

Lower Mississippi RiverLower Mississippi River

BONNET CARRE DIVERSION

RED RIVER LDG (MI 302.4)

BATON ROUGE

DONALDSONVILLE

RESERVE

NEW ORLEANS

CHALMETTE

PT A LA HACHE

VENICE (MI 10.7)

MORGANZADIVERSION

MIS

SIS

SIP

PI

GAGING STATION ANDCOMPUTATIONAL NODE

COMPUTATIONAL NODE

LATERAL INFLOW OROUTFLOW