qualitative habitat evaluation index...why include habitat assessment? 0 500 1000 1500 habitat...
TRANSCRIPT
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Qualitative Habitat Evaluation IndexQualitative Habitat Evaluation Index
• Qualitative• Habitat• Evaluation• Index
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Clean Water ActClean Water ActTITLE I—RESEARCH AND RELATED PROGRAMS
DECLARATION OF GOALS AND POLICYSEC. 101. (a) The objective of this Act is to restore and maintain
the chemical, physical, and biological integrity of the Nation’s waters.
•Chemical measures are the most developed and relied-on indicators of CWA success.
•Used extensively as surrogates for biological integrity•Linked to biology through laboratory studies•not always a direct correspondence with field observations
•Ohio has well-developed biological measures•Feds trying to elevate the chemical measures to equal status for Ohio
•Habitat quality surprisingly under-regulated•401, 404 certification (very weak protection at best)•Drainage laws functionally supersede CWA•QHEI provides a measure of habitat quality
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Why Include Why Include Habitat Habitat
Assessment?Assessment?
0 500 1000 1500
Habitat Alterations
Siltation
Organic Enrichment
Nutrients
Flow Alteration
Metals
pH
Top Causes of ImpairmentStatewide
1414
1032
865.3
698
637.9
235.1
131.8
Miles Impaired By Cause
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The Importance of HabitatThe Importance of Habitat One of Karr’s Five Factors
Water Qualitydissolved oxygenammoniasediment
Energy Sourceleaf litteralgaeputrescent matter
Hydrologysustained base‐flowflashinesssedimentgeomorphology
Physical Habitatgeologic settingland useposition in watershedcumulative scalegeomorphology
Biotic Interactionspredator‐preyinvasive speciestrophic cascade
Biological
Integrity
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QHEIQHEI
• Visual Method
• Tool For Designating Aquatic Life Uses• Tool For Assessing Causes of Impairment
• Correlated With Biological Integrity
• Associated With Sediment/Nutrient Inputs
• Effects on Biota Occur At Multiple Scales
• Matches Resolution of Biological Data
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Correlated With IBICorrelated With IBI• QHEI and its subcomponents correlated
with IBI at multiple scales
10
20
30
40
50
60
20 30 40 50 60 70 80 90 100
Data by Site All YearsECBP & HELP EcoregionsReference Sites ONLY
y = 15.4 + 0.39x R2= 0.51
Site
Spe
cifi
c IB
I
Site Specific QHEI
10
20
30
40
50
60
20 30 40 50 60 70 80
Data by Huc 11 WatershedIBI Data - 1994-2001
ECBP and HELP Ecoregions
y = 9.98 + 0.43x
R2= 0.43
Mea
n H
uc-1
1 Sc
ale
IBI
Mean Huc-11 Scale QHEI
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Erosion:Particulate PDissolved P
Leaves,WoodyDebris
Bacteria,Fungi
Nutrients & SedimentAre Intercepted byRiparian Biomass
Invertebrates (Shredders,Scrapers)
AlgaeInverts.
Predators
Herbivores
FishPredators
Sunlight isLimited By
the RiparianVegetation
Two-WayMovement ofSediment &
NutrientsWoody Debris
SlowsExport ofSediments & Increases
Conversion of Nutrients toDesirable Biomass Insectivorous
Fish
Humans Bird,Mammal
Predators
Riparian Width
Good Stream Habitat
Major Downstream Exports: I. Desirable Biomass (e.g., fish, plants, birds, mammals, sensitive species) II. Low Sediment DeliveryIII. Water Quality Suitable for ALL Uses
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One-Way Movem entof Sedim ent &
Nutrients IntoStreams
Erosion:Sediment withParticulate PDissolved P
Fine SedimentBedload with
Algae & Detritus
Lack of Woody DebrisIncreases E xport &
Conversion of Nutrients toUndesirab le Biom ass
Filt er Feed ingInvertebrates,Detritivores
Herbivores
Direct Sunlight Affects100% of Channel;
Light is Not a LimitingFactor
Grasses Comprise Majority ofRiparian “Buffer”
Predators:Invertebrates
Rapid Turnover of Nutrients(“Short Spirals”) is a Key
Characteristic
Nitrates viaSubsurfaceDrainage
Predators:Birds, Mammals
Modified Stream Habitat
External energyis required tomaintain modifiedenvironment andmaintain agricul-turalproduction Major Downstream Exports:
I. Nutrients & Undesirable Biomass (e.g., algae, detritivores, tolerant species)II. High Sediment Delivery
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QHEI: Six Major Categories of QHEI: Six Major Categories of MacrohabitatMacrohabitat
• Substrate – Size, Quality• Instream
Cover –
Type, Quality, Amount
• Channel Quality – Sinuosity, Riffle/Pool Development, Channelization, Stability
• Riparian Width, Type, Bank Stability
• Pool, Riffle/Run –
Depth, Morphology, Current Types, Riffle/Run Substrates
• Stream Gradient –
Standardized by Stream Size
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QHEIQHEIField Field SheetSheet
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QHEIQHEIBackBackSideSide
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QHEI HeaderQHEI Header
• Standard River Code & RM• Stream Name• New Station ID• Location Description• Date• Scorer• Lat/Long
Qualitative Habitat Evaluation Index Field Sheet QHEI Score:River Code: RM: Stream:
MBIMBI
Station ID:Date:
Location:Scorer: Latitude: Longitude:
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Substrate MetricSubstrate Metric
Substrate
Max 20
1] SUBSTRATE (Check ONLY Two SubstrateTYPE BOXES; Estimate % presentTYPE POOL RIFFLE POOL RIFFLE SUBSTRATE ORIGIN SUBSTRATE QUALITY
-BLDR /SLBS[10] -GRAVEL [7] ____ _ ___Check ONE (OR 2 & AVERAGE) Check ONE (OR 2 & AVERAGE)
-BOULDER [9]____ ____ -SAND [6] ____ _ ___ -LIMESTONE [1 ] SILT: - S ILT HE AVY [-2]
-COBBLE [8]____ ____ -BEDROCK[5] ____ _ ___ -TILLS [1] -SILT MODERATE [-1]
-HARDPAN [4]____ ____ -DETRITUS[3] ____ _ ___ -WETLANDS[0] -SILT NORMAL [0]
-MUCK [2]____ ____ -ARTIFICIAL[0]____ _ ___ -HARDPAN [0] -SILT FREE [1]
-SILT [2] ____ ____ -SANDSTONE [0] EMBEDDED -EXTENSIVE [-2] -RIP/RAP [0] NESS: -MODERATE [-1]
-4 or More [2] -LACUSTRINE [0] -NORMAL [0]NUMBER OF SUBSTRATE TYPES:(High Quality Only, Score 5 or >) -3 or Less [0] -SHALE [-1] -NON E [1]COMMENTS_____________________________________________-COAL FINES [-2]_________________________________________
____ ____ -Lg BOULD. [10]
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Good Substrate QualityGood Substrate Quality
Heterogeneoussize and types
Cleanfree from siltnot embedded
Parent Materialtill and limestone bestclay and muck worst
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Substrate MetricSubstrate Metric
• Identify Two Predominant Substrate Types
– By Amount or Function
• Two boxes in case one type is only dominant type (e.g.,
bedrock)
• Lines after boxes for checking or estimating % of all
substrate types present
• Pebble count procedure provides good training for assessment of substrate 1] SUBSTRATE (Check ONLY Two SubstrateTYPE BOXES; Es
TYPE POOL RIFFLE POOL RIFFLE-BLDR /SLBS[10] -GRAVEL [7] ____ _ ___Ch
-BOULDER [9]____ ____ -SAND [6] ____ _ ___
-COBBLE [8]____ ____ -BEDROCK[5] ____ _ ___
-HARDPAN [4]____ ____ -DETRITUS[3] ____ _ ___
-MUCK [2]____ ____ -ARTIFICIAL[0]____ _ ___
-SILT [2] ____ ____
-4 or More [2] NUMBER OF SUBSTRATE TYPES:(High Quality Only, Score 5 or >) -3 or Less [0] COMMENTS_____________________________________________
____ ____ -Lg BOULD. [10]
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Substrate Size CategoriesSubstrate Size Categories
• Boulder: > 10”• Boulders as slabs: flat
rather than round pieces
• Cobble: 2.5”
to 10”
• Gravel: 1/12”
to 2.5” (note wide range)
• Sand: gritty texture
• Silt: greasy texture, inorganic
• Muck: decayed organic material
• Detritus: leaves, sticks, wood
• Hardpan: usually clay, hard gummy surface
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Substrate MetricSubstrate Metric
• Substrate Diversity– Number of substrate types
• More substrate types = more “niches”• Many fish and macroinvertebrate
species are
associated with specific substrate types
• Substrate Origin– Informational– From where did the substrates originate?
• Bedrock, tills, alluvial sediments, colluvial
sediments?
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Substrate OriginSubstrate Origin• Limestone: Often contains
fossils, easily scratched
with knife, usually
bedrock or flat boulders
and cobbles• Tills: Sediments deposited
by glaciers; particles often
rounded. Can be carried
into non‐glaciated areas• Wetlands: Usually organic
muck and detritus• Hardpan: Clay – smooth,
usually slippery
• Sandstone: Contains
rounded fragment of sand
“cemented”
together
• Rip/Rap: Artificial boulders• Lacustrine: Old lake bed
sediments• Shale: “Claystone,”
sedimentary rock made of
silt/clay, soft and cleaves
easily• Coal Fines: Black fragments
of coal, generally SE Ohio
only
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Pebble Count Methodologies
• Wolman Pebble Count
• Zig‐Zag
Pebble Count
• Riffle Stability Index• Others
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Boulder‐Cobble
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Boulder slabs
Bedrock
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Gravel and cobble
Sand and detritus
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Artificial ‐
concrete
Artificial ‐
riprap
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Hardpan
Silt/clay
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Substrate OriginsSubstrate Origins
Glacial tills
Bedrock
Estimate % presentE SUBSTRATE ORIGIN
Check ONE (OR 2 & AVERAGE
-LIMESTONE [1 ] SILT -TILLS [1] -WETLANDS[0] -HARDPAN [0] -SANDSTONE [0] EMB -RIP/RAP [0] NES -LACUSTRINE [0] -SHALE [-1]
__-COAL FINES [-2]______
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Coal fines
Riprap
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Silt Cover & Silt Cover & EmbeddednessEmbeddedness
• Pervasiveness of silt cover & embeddedness
• Smother habitats
• Reduce oxygen penetration• Fines fill interstitial spaces
S
N SUBSTRATE QUALITYERAGE) Check ONE (OR 2 & AVERAGE)
SILT: - S ILT HEAVY [-2] -SILT MODERATE [-1] -SILT NORMAL [0] -SILT FREE [1]
EMBEDDED -EXTENSIVE [-2]NESS: -MODERATE [-1]
-NORMAL [0] -NON E [1]
____________________________________
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Silt CoverSilt Cover
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Silt Heavy
Silt Normal
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Clean Gravel Substrates
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EmbeddednessEmbeddedness
• Sands, other fines cover larger
substrates
• “Dunes”
indicate high bedload
• Can often dig down to larger substrates
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Embeddedness
–
Side View
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Embeddedness
– Sediment Buildup
• Import of fines > export
• Results in “agradation of sediments in riffles and pools
• Symptom can be “spongy”
deposits of
sands and fine gravels that smother larger
riffle particles
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Substrate Substrate EmbeddednessEmbeddednessRiffle
Riffle
Pool
Pool
Little/No Embeddeness:< 25 of station - only in natural
depositional areas
Riffle
Riffle
Pool
Pool
Low Embeddeness:25-50% of station - some
outside of naturaldepositional areas
Riffle
Riffle
Pool
Pool
Moderate Embeddeness:50-75% of station - poolsusually heavily embedded
Riffle
Riffle
Pool
Pool
Extensive Embeddeness:>75% of station - pools & riffles
usually heavily embedded
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Substrate Metrics Strongly Substrate Metrics Strongly Correlated with IBI, MetricsCorrelated with IBI, Metrics
• Affects overall community structure• Decrease substrate quality leads to loss of
sensitive species• Decreasing substrate quality leads to increase
in omnivores• Decrease substrate quality leads to decrease
in many sport fish species (e.g., smallmouth bass).
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EmbeddednessEmbeddedness
Little to none
Moderate
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10
20
30
40
50
60
None Low Moderate High
Data by Site, All YearsECBP & HELP Ecoregions
Reference Sites Only
Site
Spe
cifi
c IB
I
QHEI Embeddedness Rating
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Substrate Score Substrate Score vsvs
IBIIBI
0
10
20
30
40
50
60IB
ISubstrate Metric
Low High
Substrate Metric Score
0 10 20
EWH
WWH
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Smallmouth Bass vs QHEI SubstrateSmallmouth Bass vs QHEI Substrate
0
5
10
15
20
25
0-4 5-8 9-12 13-16 17-20 > 20
Wadeable Reference Sites
Rel
ativ
e N
umbe
r of
Sm
allm
outh
Bas
s Substrate Score
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8 10 12 14 16 18
WARMOUTH SUNFISH
REDEAR SUNFISH
PUMPKINSEED SUNFISH
ORANGESPOTTED SUNFISH
BLACK CRAPPIE
GREEN SUNFISH
LARGEMOUTH BASS
BLUEGILL SUNFISH
WHITE CRAPPIE
LONGEAR SUNFISH
SPOTTED BASS
ROCK BASS
SMALLMOUTH BASS
QHEI Substate Metric
Weighted Substrate Score5 10 15 20
LEAST DARTER
BLACKSIDE DARTER
JOHNNY DARTER
DUSKY DARTER
EASTERN SAND DARTER
ORANGETHROAT DARTER
CHANNEL DARTER
GREENSIDE DARTER
FANTAIL DARTER
LOGPERCH
RAINBOW DARTER
BANDED DARTER
SLENDERHEAD DARTER
BLUEBREAST DARTER
VARIEGATE DARTER
TIPPECANOE DARTER
SPOTTED DARTER
RIVER DARTER
QHEI Substate Metric
Weighted Substrate Score
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Instream Cover/ StructureInstream Cover/ Structure MetricMetric
Cover
Max 20
2]I NSTREAM COVER(Structure)
(Give each cover type a score of 0 to 3; see back for instructions) AMOUNT: (Check ONLY One orTYPE: Score All That Occur check 2 and AVERAGE )
___UNDERCUT BANKS [1] ___POOLS> 70 cm [2] ___OXBOWS, BACKWATERS [1] - EXTENSIVE > 75% [11]___OVERHANGING VEGETATION [1] ___ROOTWADS [1] ___AQUATIC MACROPHYTES [1] - MODERATE 25-75% [7]___SHALLOWS (IN SLOW WATER) [1] ___BOULDERS [1] ___LOGS OR WOODY DEBRIS [1] - SPARSE 5-25% [3]___ROOTMATS [1] COMMENTS:______________________________________________ - NEARLY ABSENT < 5%[1]3] CHANNEL MORPHOLOGY: (Check ONLY One PER Category OR check 2 andAVERAGE )
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Cover MetricCover Metric• Scores the types and amounts of cover available as habitat.
– Undercut banks– Rootwads and Rootmats
– Boulders– Logs and other LWD
– Aquatic Macrophytes
– Pools– Overhanging Vegetation– Backwaters and Shallows
2]I NSTREAM COVER(Structure)
(Give each cover type a score of 0 to 3; see back for instructions)TYPE: Score All That Occur
___UNDERCUT BANKS [1] ___POOLS> 70 cm [2] ___OXBOWS, BACKWATERS [1]
___OVERHANGING VEGETATION [1] ___ROOTWADS [1] ___AQUATIC MACROPHYTES [1]___SHALLOWS (IN SLOW WATER) [1] ___BOULDERS [1] ___LOGS OR WOODY DEBRIS [1]
___ROOTMATS [1] COMMENTS:______________________________________________
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New Cover MetricNew Cover Metric• Instructions for scoring the alternate cover metric:
Each cover type should receive a score of between 0 and 3, Where:
• 0 - Cover type absent; • 1 - Cover type present in very small amounts or if
more common of marginal quality; • 2 - Cover type present in moderate amounts, but not
of highest quality or in small amounts of highest quality;
• 3 - Cover type of highest quality in moderate or greater amounts. Examples of highest quality include very large boulders in deep or fast water, large diameter logs that are stable, well developed rootwads in deep/fast water, or deep, well-defined, functional pools.
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Rootwads/LogsRootwads/Logs
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High Quality High Quality RootwadRootwad
• Sycamore among the best quality
• Large diameter roots
• Best when in deep water
• Best when in or adjacent to fast water
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BouldersBoulders• Examine all cover
types to determine whether they are
functional!
Functional Boulder: In
Deep, Fast Water
Non‐Functional Boulder:
In Shallow Water &
Embedded
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Aquatic Aquatic MacrophytesMacrophytes
• Only macrophytes, not algae or diatoms
• Emergent or submergent
• Great nursery areas• Improve riffle quality by
making riffles narrower and deeper
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Undercut BanksUndercut Banks• Needs to be in deep enough water and undercut enough
to provide function as cover• If undercut is part of rootwad count as rootwad, not as
undercut
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RootmatsRootmats
• Fine fibrous roots of willows and other
plants
• Small fish may use these as cover or feed
on invertebrates that colonize them
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Logs and Logs and Woody DebrisWoody Debris
• Habitat forming functions
• Fish cover• Macroinvertebrate
production, especially in big rivers
• Bank protection
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Large Logpiles = Big FishLarge Logpiles = Big Fish
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Overhanging Overhanging VegetationVegetation
• Shading• Refuge from avian
predators (e.g.,
kingfishers, herons)• Terrestrial food• Does not include high
canopy
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Oxbows, Backwaters, & Side Channels
• Oxbows, backwaters, and side channels are excellent nursery habitat
• Sequester/transform nutrients
• Spawning areas (e.g., northern pike, muskie)
Oxbow
Backwater
10
20
30
40
50
60
Absent Present Absent Present
IBI
Aquatic PlantsOxbows, Backwaters,
Sidechannels
N = 317
N = 105N = 431
N = 10
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Shallows in Slow WaterShallows in Slow Water• Y‐O‐Y fish use margin areas to feed and
escape predators
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Amount of CoverAmount of CoverCover
Max 20
AMOUNT: (Check ONLY One orcheck 2 and AVERAGE ) - EXTENSIVE > 75% [11] - MODERATE 25-75% [7] - SPARSE 5-25% [3] - NEARLY ABSENT < 5%[1]
E )
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Cover vs IBICover vs IBI
10
20
30
40
50
60
0-4 5-8 9-12 13-16 17-20
IBI
Cover Metric Score
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Channel
Max 20
SINUOSITY DEVELOPMENT CHANNELIZATION STABILITY MODIFICATIONS/OTHER - HIGH [4] - EXCELLENT [7] - NONE [6] - HIGH [3] - SNAGGING - IMPOUND.
- MODERATE [3] - GOOD [5] - RECOVERED [4] - MODERATE [2] - RELOCATION - ISLANDS - LOW [2] - FAIR [3] - RECOVERING [3] - LOW [1] - CANOPY REMOVAL - LEVEED
- NONE [1] - POOR [1] - RECENT OR NO - DREDGING - BANK SHAPINGRECOVERY [1] - ONE SIDE CHANNEL MODIFICATIONS- IMPOUNDED [-1]
3] CHANNEL MORPHOLOGY: (Check ONLY One PER Category OR check 2 andAVERAGE )
Channel Morphology MetricChannel Morphology Metric
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Channel Condition MetricChannel Condition Metric
• Four measures related to channel condition
• Sinuosity (pool formation)
• Pool/Riffle Development
• Channel Modification
• Channel Stability
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SinuositySinuosityRatio of Channel Length to Downvalley Distance
No Sinuosity
LowSinuosity
Bend Poorly Defined
ModerateSinuosity
1
2
3
HighSinuosity
1
2
34
56
Function: Creates depth and habitat heterogeneity, more habitat per unit distance
SINUOSITY - HIGH [4] - MODERATE [3] - LOW [2] - NONE [1]
3] CHANNEL MOR
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DEVELOPMENT - EXCELLENT [7] - GOOD [5] - FAIR [3] - POOR [1]
RPHOLOGY: (Check
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Development Development ‐‐
Riffle/Pool Riffle/Pool ComplexesComplexes
• Pool ‐
slow current velocity; greater depth
• Riffle ‐
fast current velocity and shallow depth; water surface
is visibly broken• Run ‐
rapid flow and deeper than riffles; generally located
downstream from riffles; water surface is not visibly broken• Glide ‐
flat, “canal‐like”
flow; shallow, generally poor habitat
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RiffleRiffle‐‐Pool DevelopmentPool Development
Excellent Good Fair Poor
Pool> 1 m deep,well defined
0.7- 1.0 m deep, well
defined
Some depth variation
Shallow if present
Glide Not Dominant Not Dominant Common Predominant
RiffleDeep, well
defined riffles with large substrates
Defined riffles, large substrates
Poorly defined riffles or
riffles absent
Absent or shallow with fine substrate
Run > 0.5 m deep, well defined
Deep, well defined Usually absent Absent
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Good DevelopmentGood Development
Well‐definedriffle‐pool‐runsequences
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Poor DevelopmentPoor Development
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No No ChannelizationChannelization
CHANNELIZATION] - NONE [6] - RECOVERED [4] - RECOVERING [3] - RECENT OR NORECOVERY [1]- IMPOUNDED [-1]
ONLY One PER Categ
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RecoveringRecovering
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Recent Channelization or No Recovery
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Stable Channel CharacteristicsStable Channel Characteristics
• Mature Riparian• Deep Pools• Stable, vegetated non‐
eroding banks• Large diameter,
unembedded substrates
• Well defined pools and riffles
STABILITY M - HIGH [3] - MODERATE [2] - LOW [1]
egory OR check 2 andA
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Channel InstabilityChannel Instability
• Signs of Instability:– Unvegetated Point
Bars
– Shallow, Fine Diameter, Diagonal
Riffle Features
– High Bedload– Bank Erosion
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Channelization and StabilityChannelization and Stability• Simplifies habitat
– no living space except for
species that exploit disturbance
• Not an equilibrium state– requires maintenance
– leads to instability, especially
bank erosion
•Reduces the use of the waterbody
to conveyance only – as currently
practiced.
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ModificationsModifications
CMODIFICATIONS/OTHER - SNAGGING - IMPOUND.
- RELOCATION - ISLANDS - CANOPY REMOVAL - LEVEED
- DREDGING - BANK SHAPING - ONE SIDE CHANNEL MODIFICATIONS
dAVERAGE )
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0
10
20
30
40
50
60
0-2 3-6 7-10 11-13 14-16 17-20
IBI
Channel Condition Metric
Channel Metric Score
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Riparian
Max 10
4]. RIPARIAN ZONE AND BANK EROSION-(check ONE box per bank or check 2 and AVERAGE per bank) River Right Looking DownstreamRIPARIAN WIDTH FLOOD PLAIN QUALITY (PAST 100 Meter RIPARIAN) BANK EROSION
L R (Per Bank) L R (Most Predominant Per Bank) L R L R (Per Bank) -FOREST, SWAMP [3] -CONSERVATION TILLAGE [1] -NONE/LITTLE [3] -SHRUB OR OLD FIELD [2] -URBAN OR INDUSTRIAL [0] -MODERATE [2] -RESIDENTIAL,PARK,NEW FIELD [1] -OPEN PASTURE,ROWCROP [0] -HEAVY/SEVERE[1]
-FENCED PASTURE [1] -MINING/CONSTRUCTION [0]
Comments:
- WIDE > 50m [4]
- MODERATE 10-50m [3]- NARROW 5-10 m [2]
- VERY NARROW <5 m[1] - NONE [0]
- VERY WIDE > 100m [5]
Riparian Zone and Bank ErosionRiparian Zone and Bank ErosionMetricMetric
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Woody Riparian QualityWoody Riparian Quality
• Effects increase in
importance as they
accumulate in a watershed:
Death of a Thousand Cuts!• Bank stabilization• Assimilation/storage of
nutrients and sediment• Temperature moderation
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Riparian WidthRiparian Width
• Riparian vegetation includes trees, shrubs and wetlands; not grasses
• Select one width or two and average for each bank, then average banks together
4]. RIPARIAN ZONE AND BRIPARIAN WIDTH
L R (Per Bank)
- WIDE > 50m [4]
- MODERATE 10-50m [3]- NARROW 5-10 m [2]
- VERY NARROW <5 m[1] - NONE [0]
- VERY WIDE > 100m [5]
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Functional Riparian Zone in ActionFunctional Riparian Zone in Action
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Adjacent Land Use/ FloodplainAdjacent Land Use/ Floodplain
• Area outside of existing
riparian that can strongly
affect stream via runoff
• Screening data, most
accurate data from photos or
GIS
FLOOD PLAIN QUALITY (PAST 100 Meter RIPARIAN)L R (Most Predominant Per Bank) L R -FOREST, SWAMP [3] -CONSERVATION TILLAGE [1] -SHRUB OR OLD FIELD [2] -URBAN OR INDUSTRIAL [0] -RESIDENTIAL,PARK,NEW FIELD [1] -OPEN PASTURE,ROWCROP [0] -FENCED PASTURE [1] -MINING/CONSTRUCTION [0]
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Shading
• In streams with good habitat, good riparian shading and elevated nutrients, effects of these nutrients may be somewhat moderated by limiting light penetration
• Sunlight is match thrown on nutrient fuel
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Excess Nutrients + No Shade =
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Bank ErosionBank Erosion
• Scores based on Streambank Soil Alteration Rating of
Platts et al. (1983)
• In many cases bank erosion is greatest
source of bedload
• False banks are considered eroded
Riparian
Max 10
River Right Looking DownstreamBANK EROSION
L R (Per Bank) -NONE/LITTLE [3] -MODERATE [2] -HEAVY/SEVERE[1]
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Riparian encroachment ultimately leads to Riparian encroachment ultimately leads to bank destabilization and bank erosionbank destabilization and bank erosion
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False BanksFalse Banks
• False banks are formed when stream
banks are trampled by livestock and a
steep bank is formed back from the
waters edge
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Pool/Glide and Pool/Glide and Riffle/Run MetricRiffle/Run Metric
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PoolPool‐‐Glide & RiffleGlide & Riffle‐‐Run QualityRun Quality
• Deeper pool = better pool• Deeper riffles & runs = better quality• Diversity of current velocities best• Morphology of riffles/pools affects
characteristics and quality
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Riffle‐Pool Morphology
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RiffleRiffle• areas of the stream
with fast current velocity and shallow depth;
• the water surface is visibly broken by rocks, boulders, etc.
•
Functions:–
High production zone for
macroinvertebrates
–
Spawning area for many
sensitive species
–
Feeding area for species
groups such as darters
–
Oxygenation
–
Filtration and pollution
assimilation (high surface area
relative to the volume of water
passing through and over)
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Engineered Riffles Trickling Sand Filter
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RunRun• areas of the stream that have
rapid flow but lack the depth
discontinuity of a riffle;• runs are deeper than riffles with
faster current velocity than pools;• generally located down‐stream
from riffles where the stream
narrows; • the stream bed is often flat
beneath a run and the water
surface is not visibly broken.
• Functions:– Spawning Area– Feeding Area– Oxygenation– Macroinvertebrate
Production
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Riffle/Run CharacteristicsRiffle/Run Characteristics
• What is depth of better
riffle and run areas?
• Measure depths in areas
that are clearly run or
riffle
• Are substrates coarse or
fine?
• Are substrates in
riffle/run area
embedded?
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PoolPool• an area of the stream with
slow current velocity;
• depth greater than riffle
and run areas;
• the stream bed is often
concave;
• stream width frequently is
the greatest;
• the water surface slope is
nearly zero.
• Functions:– Low Flow Refugia– Nursery Area– Resting Area– Cover
5.]POOL/GLIDE AND RMAX. DEPTH
(Check 1 ONLY!) - >1m [6]
- 0.7-1m [4] - 0.4-0.7m [2]
- 0.2- 0.4m [1] - < 0.2m [POOL=0]
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GlideGlide
• Flat, “canal‐like”
flow
• Shallow, generally poor habitat
• Transitional in natural streams
• Can be predominant in channelized and
altered streams
PO O L
•
Functions:
‐
Shallow nursery areas
‐
Invertebrate production
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Stream FlowStream Flow
• Not explicitly measured in QHEI
• Reflected in certain metrics
• Can be limiting to aquatic life in many
instances• Consider flow regime
when interpreting data
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Current Velocities in Streams
Eddy FastModerateCURRENT VELOCITY [ POOLS & RIFF
(Check All That Apply) -EDDIES[1] -TORRENTIAL[-1]
-FAST[1] -INTERSTITIAL[-1] -MODERATE [1] -INTERMITTENT[-2]
-SLOW [1]____________________________________
-VERY FAST[1] -NONE [-1]
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Sharp drop from front to back of rod and boot indicates fast current velocities
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0 1 2 3 4 5 6 7 8
TIPPECANOE DARTER
BLUEBREAST DARTER
SPOTTED DARTER
VARIEGATE DARTER
SLENDERHEAD DARTER
BANDED DARTER
EASTERN SAND DARTER
GREENSIDE DARTER
RAINBOW DARTER
LOGPERCH
CHANNEL DARTER
DUSKY DARTER
FANTAIL DARTER
BLACKSIDE DARTER
JOHNNY DARTER
ORANGETHROAT DARTER
LEAST DARTER
RIVER DARTER
QHEI Riffle Metric
Weighted Riffle Score
Large, Fast, Deep RifflesLow Embeddedness
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Gradient MetricGradient Metric
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Calculating Stream GradientCalculating Stream Gradient
• Locate site on topo map
• Find upstream and downstream contour
line crossings• Calculate miles
between contours• E.g. 640’
–
630’/1.5
miles = 6.67’/mile
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Gradient Metric ScoreGradient Metric Score
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To the streams!!