Public Information Statement
Issued by NWS Seattle/Tacoma, WA

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NOUS46 KSEW 241625

Public Information Statement
National Weather Service Seattle WA
925 AM PDT Mon Oct 24 2016

...New Hydrologic Services for the White River and Dungeness
River Basins...

Two new river forecast/flood warning points will be added to the
flood warning program in the Seattle Weather Forecast Office
hydrologic services area; on the White River and the Dungeness
River. The gages to be used are the U.S. Geological Survey gage
White River at R Street near Auburn and the Dungeness River near
Sequim. These new services will be implemented Wednesday, October
26, as weather permits.

Flood warnings for the White River R St. gage will address flooding
from Auburn down to the confluence with the Puyallup River,including
the cities of Auburn, Pacific, and Sumner. This area has seen an
increasing flood threat over the last several years due to changes
in the streambed. Flood flow is 6,000 cubic feet per second which
occurs near the gage stage height of just over 114 feet. Here are
the flood levels for the three flood categories:

Minor Flood flow/flood warning level.....6,000 cfs
Moderate flood flow......................8,000 cfs
Major flood flow........................10,000 cfs

The changing nature of this river will likely mean continued
adjustments to the flood levels in the coming years.

The current White River forecast/flood warning point at Mud Mountain
Dam will remain. Flood warnings for the Mud Mountain Dam outflow
will now address only the flooding concerns from near the dam down
to just upstream of Auburn.

The Dungeness River is already a flood warning point but did not
have a hydrologic model to use for forecasting the river levels. The
Northwest River Forecast Center has developed a new hydrologic model
for this river to produce year-around river forecasts, including
water supply volume forecasts.

If you would like more information about the National Weather
Service hydrologic services in the Seattle area...please contact
Brent Bower...Senior Service 206-526-6095.



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