Change in Flood Stages for Bismarck River Gage

SERVICE CHANGE NOTIFICATION
NATIONAL WEATHER SERVICE BISMARCK ND
257 PM CDT MON APR 2 2012

...SERVICE CHANGE NOTIFICATION...

THE NATIONAL WEATHER SERVICE IN BISMARCK...ALONG WITH LOCAL AND
STATE PARTNERS...HAVE REVISITED THE PROPER STAGE DEFINITION OF
FLOODING AS DETERMINED BY READINGS AT THE BISMARCK GAGE ON THE
MISSOURI RIVER. BASED ON COMMENTS AND NOTED IMPACTS FROM THE 2011
FLOOD EVENT...THE NEW DEFINITIONS FOR FLOOD STAGES ARE AS FOLLOWS.

ACTION STAGE EQUALS 12.5 FEET AND IS THE STAGE AT WHICH LOCAL
RESIDENTS SHOULD BEGIN TO EVALUATE THE RISK OF HIGHER WATER.

MINOR FLOOD STAGE EQUALS 14.5 FEET AND IS THE STAGE AT WHICH MINOR
DAMAGE BEGINS IN RURAL AREAS.

MODERATE FLOOD STAGE EQUALS 16.0 FEET AND IS THE STAGE AT WHICH
THE RURAL HOMES ARE IMPACTED AND THE CITY OF BISMARCK MUST EMPLOY
PROTECTIVE MEASURES.

MAJOR FLOOD STAGE EQUALS 18.0 AND IS THE STAGE AT WHICH
SIGNIFICANT DAMAGE AND EVACUATIONS OCCUR.

THE ABOVE CHANGES WILL BECOME EFFECTIVE ON 2 MAY 2012.

ANY QUESTIONS CAN BE DIRECTED TO ALLEN SCHLAG...SERVICE
HYDROLOGIST...AT 701 250 4495.



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