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Last modified
1/25/2010 7:10:40 PM
Creation date
10/5/2006 2:42:42 AM
Metadata
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Template:
Floodplain Documents
County
Statewide
Community
All
Stream Name
All
Basin
South Platte
Title
ASFPM Abstracts, etc. 1994
Date
1/1/1994
Prepared For
ASFPM
Prepared By
ASFPM
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />t <br />~ <br />f; <br />t <br />r <br /> <br />I f <br />f <br />t <br />r <br />f <br /> <br />f <br />f <br />j. <br />, <br />\.; <br /> <br />~. <br />r <br />< <br />~~ <br /> <br />, <br />, <br />~" <br />r <br />I <br />, <br /> <br />FOREST PRACTICES AND THEIR AFFECTS <br />ON FLOODPLAIN ANALYSES <br /> <br />Lawrence Basich, P.E. <br />FEMA Region X <br />BotheD, Washington <br /> <br /> <br />Since the mid 1970's, the Snoqualmie River Basin in King County, Washington, has experienced <br />forest cutting practices that, according to local theories, result in significant changes in the runoff <br />characteristics of the watershed. The purpose of this paper is not to document the effects of <br />forest practices, but to provide a procedure that FEMA recommends when reanalyses are being <br />contemplated based on severe: forestation practices. Since these practices may affect a large <br />segment of the country, a logical and accepted process is needed to allow for the prompt review <br />and revision ofFEMA flood maps. <br /> <br />In King County, we have been working with the county to resolve what is a large concern on their <br />part. Just looking at the raw statistics, it could easily be concluded that the forest practices have <br />led to severe increases in runoff. A recomputation of the statistics for the entire period of record <br />revealed that the 100 year flows have increased over 50 percent. If you examine just the recent <br />period of record when the actual logging has taken place and become effective, the 100 year has <br />increased by more than 100 percent. With these statistics in hand, the County has become <br />increasingly alarmed. <br /> <br />FEMA has put together an approach that deals with these types of situations that looks more <br />toward the holistic evaluation than just the immediate one. <br /> <br />Lawrence Basich, P.E., Civil Engineer, FEMA Region X, Federal Regional Center, 130 228th Street, <br />S.W., Bothell, Washington 98021-9796, Tel. (206) 487-4703 <br />
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