Qualitative Habitat Evaluation Index
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Qualitative Habitat Evaluation Index
Bradley HansenJohn Nieber
Department of Bioproducts and Biosystems Engineering
For BBE 4535/5535Fall 2011
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Qualitative Habitat Evaluation Index (QHEI)
• The QHEI was developed by the Ohio EPA for assessment of habitat loss due to sediment
• It can evaluate whether habitat is a limiting factor for a fish community, and which factors are the likely stressors
• It can also help determine both the source of the sediment and the effects on the stream
• Correlated to fish IBI scores
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Consists of 6 Metrics• Substrate• Instream Cover• Channel Morphology• Riparian Zone and Bank Erosion• Pool – Riffle Quality• Map Gradient
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Substrate
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Riffle
Pool
Riffle
Pool
Pool
None Low Moderate Extensive
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Metric 2: Instream Cover• Type• Amount
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Instream Cover
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Metric 3: Channel Morphology
• Sinuosity – number of bends in the reach• Development – pool-riffle complex• Channelization – human made channel
modifications• Stability – bank and channel stability
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Channel Morphology
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stability channelization
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Pool/Riffle Development
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Metric 4: Riparian Zone and Bank Erosion• Width
– Floodplain • Quality
– Landuse• Bank Erosion
– Stability
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Riparian Zone
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Metric 5: Pool-Riffle Quality• Max. DepthPool and Riffle• CurrentVelocity estimate• MorphologyPool-Riffle width
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Pool-Riffle Quality
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Metric 6: Map Gradient• Channel slope - Measure stream lengthbetween two contoursdivide by contourinterval
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Map Gradient
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Individual metrics
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Score
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Qualitative Habitat Evaluation Index• It can evaluate whether habitat is a
limiting factor for a fish community, and which factors are the likely stressors
• It can also help determine both the source of the sediment and the effects on the stream