integrated resource inventory - wyoming state...
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Integrated Resource InventoryUS Forest Service
bhigginson, November 2003
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Purpose of IRI
• Spatially locate, integrate, and describe basic water, land, and vegetation data for use in a geographic information system (GIS).
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Three Themes to IRI
• Common Water Unit – Aquatic system• Common Land Unit – Geology, geomorpholgy,
soils, and potential natural vegetation• Common Vegetation Unit – Transitory
vegetation that currently exists
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Common Water Unit
Watershed Level• Watershed delineation down
to sixth level HUBs• Sixth level HUBs are also
the base for the CVU and CLU
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North Fork Map
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Stream Delineation
• Stream network• Supplemental water features (ditches)• Lakes, ponds, and reservoirs
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Crenulation Delineation
• Delineation of crenulations• Contour bend angle of 120o or less
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Shoshone NF Streams
10,319Crenulations4,550Intermittent3,926PerennialMilesStreams
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CWU Valley Segment Delineation
• Use aerial photos to stratify perennial and intermittent streams into valley segments based upon physical characteristics
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Valley Segment Attributes
• Rosgen stream type• Valley type• Stream gradient class (<1.5%, 1.5-3.9%, or >4%)• Channel materials (alluvium, colluvium, etc.)• Riparian width• Dominant and secondary riparian vegetation type (tree,
shrub, grass/forb, or bare)
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Rosgen slide
Rosgen, D. - http://www.wildlandhydrology.com/
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Brooks Lake Creek
• “Aa+” Stream Type
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Crow Creek• “B” Stream Type
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• “C” Stream Type
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• “E” Stream Type
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Rosgen Valley TypesI. V notched canyons (steep)II. Colluvial valleys (moderately steep)III. Alluvial fan or debris coneIV. Gorges and confined alluvial valleysV. Glaciated Valley (“U” Shaped)VI. Fault controlled valleys (moderately steep)VII. Highly dissected fluvial slopesVIII.Wide/gentle valley with large floodplain and terraces.IX. Broad valley - glacial outwash or eolian sand dunesX. Broad valley with larger floodplain
Source: Rosgen, D. 1996. “Applied River Morphology”
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Channel Materials
• Alluvium• Colluvium• Residual• Bedrock• Organic• Mass Movement• Glacial
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Lacustrine System
Waterbody layer• Perennial lake or pond• Intermittent lake or pond• Reservoir• Dry lake or pond• Marsh• Permanent snowfield or glacier
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Shoshone NF Waterbodies
• There are 3,915 lakes, ponds, and reservoirs on the Forest
• These waterbodies cover 14,921 acres of the Forest
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• Bighorn NF complete in 1999• Shoshone NF to be completed at
end of 2004
IRI Status
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Shoshone NFCWU Status
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IRI Uses
• Identify reaches that are sensitive to management activities
• Identify road/stream crossings• Stratify based on flow regime or stream type
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• Stream Type Sensitivity (Rosgen, 1996)
Source: Rosgen, D. 1996. “Applied River Morphology”
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IRI Contacts
• Bighorn NF– Dan Scaife 674-2646, [email protected]
• Shoshone NF –– CWU – Brad Higginson 578-1289, [email protected],– CWU – Robert Vannoy 578-1257, [email protected]– CVU – Myrna Ulmer 587-1211, [email protected]– CLU – Kathy Emerson 587-1283, [email protected]