Parent Layer: Risk Metrics

Name: Dam Impoundment (% Basin)

Display Field: name

Type: Feature Layer

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Description: The percentage of the contributing basin that is located behind a dam is used to describe the degree to which dams may affect hydrology and sediment delivery at river delta sites. We assume that river delta sites with substantial dam impoundment may have reduced sediment budgets, resulting in reduced aggregation of marsh surface under sea level rise, reduced delivery of large wood and moderated flood flows that affect distributary migration and channel formation processes. Many other factors may affect how the effect of dam impoundment on sediment routing affects delta systems. <a href="http://www.pugetsoundnearshore.org/technical_papers/psnerp_strategies_maps.pdf">Metadata</a>

Copyright Text: PSNERP with support from Anchor Environmental

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Spatial Reference: 102100  (3857)

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• swamparea ( type: esriFieldTypeDouble, alias: SwampArea )
• wetlandarea ( type: esriFieldTypeDouble, alias: WetlandArea )
• deltalength ( type: esriFieldTypeDouble, alias: DeltaLength )
• lostlength ( type: esriFieldTypeDouble, alias: LostLength )
• wetlandloss ( type: esriFieldTypeDouble, alias: WetlandLoss )
• tidalflowdeg ( type: esriFieldTypeDouble, alias: TidalFlowDeg )
• nearshoreimpervious ( type: esriFieldTypeDouble, alias: NearshoreImpervious )
• watershedimpervious ( type: esriFieldTypeDouble, alias: WatershedImpervious )
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