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The ranking formula relies on three types of indicator metrics: protection factors, observed impacts, and potential impacts. Protection metrics are indicators of the level and need for protection of a watershed. Observed impacts are measured deficiencies. Most of the observed impact metrics come from stream assessments showing how well the monitored streams in the watershed support uses such as swimming, water supply, and aquatic life. Potential impact metrics are included to compensate for the fact that monitoring efforts are necessarily limited and do not cover every stream in every watershed. Data related to the levels in each watershed of various activities that can cause water problems were included as potential impact metrics. The relative values for each watershed were determined for each metric and fed into the formula. A technical document on the design of the ranking formula is available from the Division of Water site: Prioritization Formula Guidelines. (This is in PDF format, so you will need Adobe Acrobat; Adobe Systems will let you download a free copy. The use of rankings in the watershed process is described on the Ranked Watersheds page.
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