natural riparian resources water landscape & soilvegetation
TRANSCRIPT
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Natural Riparian Resources
Water
Landscape & Soil Vegetation
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Water
Part of all physical and biological processes Weathering process Energy Material
Transport Deposition
Essential for all plants and animals
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Hydrologic Cycle
StreamInfiltration
DepressionStorage
Water TableGround Water
EvaporationPrecipitation
PercolationSaturated Zone
Transpiration
Surface Runoff orOverland Flow
Surface RunoffOverland Flow
Interflow
Lake or Ocean
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Watershed or Catchment
Geographic Area Catches
precipitation Drains water Has a single outlet
or stream
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Fixed Watershed Variables
Area
Shape
Orientation
Slope
Geology
Drainage Pattern
Elevation
Climate
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Management Influenced Watershed Variables
Impervious Area
Soils
Drainage Density
Vegetation
Channel Features
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Standard Checklist (lotic)
Yes No N/A HYDROLOGY
F 1) Floodplain above bankfull is inundated in “relatively frequent” events
Rationale:
2) Where beaver dams are present they are active andstable
rationale:
3) Sinuosity, width/depth ratio, and gradient are in balancewith the landscape setting (i.e., landform, geology, andbioclimatic region)
Rationale:
4) Riparian-wetland area is widening or has achievedpotential extent
Rationale
5) Upland watershed is not contributing to riparian-wetlanddegradation
Rationale:
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1) Floodplain above bankfull is inundated in “relatively frequent” events
BankfullBankfull
FloodplainFloodplain
TerraceTerrace
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Discharge at bankfull stage creates & maintains channels Moves sediment Forms or removes bars Forms or changes bends and meanders Results in the average geomorphologic channel characteristics Recurs every 1 to 2 years
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Bankfull Indicators Deposition Features
Top of point bars Change in Vegetation
Especially lower limit of continual line of perennial species, at least 1 ft.
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Bankfull Indicators
Change in particle size of bank materialBoundary between cobble/boulder and fine grained sand or silt
Undercut banksUsually slightly below bankfull stage
Stain lines or lower extent of lichens on boulders (Usually in large rivers)
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Floodplain
Level area near a stream channelConstructed by the streamIn the present climateFlooded during moderate eventsShould not be confused with “terraces” (abandoned floodplains) 1994 Leopold
Floodplain
TerraceTerrace
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Should this stream type have a floodplain?
How wide should it be?
How wide is it?
Is the stream channel incised or over sized?
Has widening begun?
Are most terrace walls sloped indicating widening has stopped?
Is there an up stream reservoir?
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Should this stream type have a floodplain?
How wide should it be?
How wide is it?
Is the stream channel incised or over sized?
Has widening begun?
Are most terrace walls sloped indicating widening has stopped?
Is there an up stream reservoir?
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2002
Should this stream type have a floodplain?
How wide should it be?
How wide is it?
Is the stream channel incised or over sized?
Has widening begun?
Are most terrace walls sloped indicating widening has stopped?
Is there an up stream reservoir?
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2) Where beaver dams are present, they
are active and stable
Beaver must be present or the dam is causing hydrologic effectsSufficient building materials must be presentSufficient food supply must be presentUsually a single dam is subject to high storm events
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Are beaver dams currently acting as hydrologic modifiers?
Are beaver present?
Are beaver actively maintaining the dam?
Is there sufficient food to support the beaver?
Is the dam self-sustaining, e.g., significant vegetation is rooted in the dam?
Is the beaver dam a single large dam?
Are the beaver dams in a complex?
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Are beaver dams currently acting as hydrologic modifiers?
Are beaver present?
Are beaver actively maintaining the dam?
Is there sufficient food to support the beaver?
Is the dam self-sustaining, e.g., significant vegetation is rooted in the dam?
Is the beaver dam a single large dam?
Are the beaver dams in a complex?
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Are beaver dams currently acting as hydrologic modifiers?
Are beaver present?
Are beaver actively maintaining the dam?
Is there sufficient food to support the beaver?
Is the dam self-sustaining, e.g., significant vegetation is rooted in the dam?
Is the beaver dam a single large dam?
Are the beaver dams in a complex?
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1992
1995
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3) Sinuosity, width/depth ratio, and gradient are in balance with the landscape setting (i.e., landform, geology, and bioclimatic region)
Question has three parts Sinuosity Width/Depth ratio Gradient
All three must be “yes” for the answer to be “yes”
Must be appropriate for the site
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Is the stream actively eroding and building point bars?
Are there indications of channel straightening?
Does the sinuosity appear to be appropriate for the valley bottom type?
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Is the stream actively eroding and building point bars?
Are there indications of channel straightening?
Does the sinuosity appear to be appropriate for the valley bottom type?
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Width/Depth Ratio
Base Flow
Bankfull
Bankfull Width / Average Bankfull Depth
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“most streams cross-section are not parabolic or semicircular (dish-shaped) in shape along the straighter reaches” Leopold 1994
“Rather, they are usually trapezoidal in shape with distinctlydeveloped streambanks” Leopold 1994
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Overwidened bankfull inidcators Bank slumping and shearing Woody species growing within the channel Dish-shaped banks
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Width/Depth Ratio Is the stream channel dish-shaped? Are the streambanks barren or dominated by increaser or colonizing
species? Are streambanks undercut and/or slumping? Are the streambanks jagged (like a saw blade)? Is the floodplain the appropriate size (see question 1)?
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Width/Depth Ratio Is the stream channel dish-shaped? Are the streambanks barren or dominated by increaser or colonizing
species? Are streambanks undercut and/or slumping? Are the streambanks jagged (like a saw blade)? Is the floodplain the appropriate size (see question 1)?
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Is the channel incised?
Does the channel appear to be straightened?
Does the sinuosity appear to be appropriate for the valley bottom type?
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Is the channel incised?
Does the channel appear to be straightened?
Does the sinuosity appear to be appropriate for the valley bottom type?
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4) Riparian-wetland area is widening or has achieved potential extent
Question has two parts Is riparian/wetland area widening?
As the water table raises, riparian/wetland area can expand outward
As a stream channel narrows, the riparian/wetland areas expands toward the center of the channel
Or, Has it reached potential extent? Stream in a stable condition
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Does the stream have the potential or capability to make a riparian area?
Are riparian species present only because their established roots still reach the water table?
Are riparian/wetland species regenerating?
Are upland species invading the riparian area?
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Does the stream have the potential or capability to make a riparian area?
Are riparian species present only because their established roots still reach the water table?
Are riparian/wetland species regenerating?
Are upland species invading the riparian area?
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Is the channel narrowing?
Are point bars increasing in size?
Is the floodplain fully developed?
Is upland vegetation such as sagebrush dying?
Is the channel incised?
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Is the channel narrowing?
Are point bars increasing in size?
Is the floodplain fully developed?
Is upland vegetation such as sagebrush dying?
Is the channel incised?
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5) Upland watershed is not contributing to riparian degradation
Is there riparian/wetland or water quality degradation coming from the uplands Watch wording carefully
Not contributing “Yes” Contributing “No”
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Are there major changes in the watershed above this point such as logging, mining, agriculture, high road density, or vegetative manipulation?
Is there sufficient precipitation to cause increase flow as a result of these changes?
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Are there major changes in the watershed above this point such as logging, mining, agriculture, high road density, or vegetative manipulation?
Is there sufficient precipitation to cause increase flow as a result of these changes?
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Is there evidence of channel degradation because of increased flow from the watershed?
Is there evidence of sediment from the upland degrading the riparian area?
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Is there evidence of channel degradation because of increased flow from the watershed?
Is there evidence of sediment from the upland degrading the riparian area?
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Natural Riparian Resources
Landscape & Soil
Water
Vegetation