Public Information Statement
Issued by NWS Seattle/Tacoma, WA

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NOUS46 KSEW 281519

Public Information Statement
National Weather Service Seattle WA
819 AM PDT Fri Oct 28 2016

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

Two new river forecast/flood warning points have been 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 being used are the U.S. Geological Survey gage
White River at R Street near Auburn and the Dungeness River near

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 stream bed. 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 remain. Flood warnings for the Mud Mountain Dam outflow now
address only the flooding concerns from near the dam down to just
upstream of Auburn.

The Dungeness River was already a flood warning point but did not
used have a hydrologic model to use for forecasting the river
levels, until today. 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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