Prioritizing Fish Passage Remediation Decision Assisting Tools

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Prioritizing Fish Passage Remediation Decision
Assisting Tools
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Prioritization Factors
Intrinsic Potential of Habitat
Remediation Prioritization and No Remediation
Threshold Determination
Efficacy
Risk
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Fuzzy MembershipGradient
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IF xgt2 then y-0.035714285(x) 1.0714285 IF xlt2
then y1
Habitat Value
0
30
0
15
Stream Gradient
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Fuzzy MembershipBedwidth
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Habitat Value
IF xlt10 then y (0.1)(x) (0) IF xgt10 then y
y 1
0
15
0
10
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Stream Bedwidth (meters)
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Fuzzy MembershipPool Frequency
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Habitat Value
IF x lt 0.5 then y (1.98)(x) 0.01 IF xgt0.5
then y 1
0
1
0
0.5
Pool Frequency (pools/meter)
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Prioritization FactorsIntrinsic Potential of
Habitat
Intrinsic Potential of Habitat (IPH) Quality
and Quantity of Habitat Upstream of Xing
IPH (Gradient Bedwidth Pool Frequency) / 3
Length of Habitat
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• Habitat Survey
• of
• Streams Associated with Culverts not meeting
• Fish Passage Standards

A.K.A. UA Surveys
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Objectives

• Determine Reach characteristics upstream of
  Red culverts for use in prioritizing fish
  passage remediation at road crossings
• Geographically position and attribute fish streams

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Survey Measurements
Extent of Fish Habitat
Streams (main channel and tributaries) are
surveyed upstream of the road either 1,000 meters
or the total extent of fish habitat, whichever is
the lesser.
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Survey Measurements

• Extent of Fish Habitat

• Fish Presence

• Stream Bedwidth

• Stream Gradient

• Pool Frequency

• Streambank Control

• Bankfull Width

• Incision Depth

• Process Group

• Stream Class

• GPS Coordinates

• Migration Barriers

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GPS Cover of UA Survey
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Length of Fish Habitat Upstream of Red Culverts
n 1,058
Mean 445 meters Median 241 meters
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Length of Fish Habitat Upstream of Red
Culverts(0 to 100 meters)
n242
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Number of Habitat Surveys Upstream of RED
Culverts
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Length of Fish Habitat Upstream of RED Culverts
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Prioritization Factors
Intrinsic Potential of Habitat
Remediation Prioritization and No Remediation
Threshold Determination
Risk
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Prioritization FactorsRisk
Risk Factors that Impose Risk to Fish Populations

• Risk Factors
• Barrierity or the degree of barrier imposed by
  the culvert
• Species Richness Anadromous vs. Resident Stream
  Reach
• Watershed Scale Effects
• Cumulative Effect proportion of watershed
  obstructed by all xings
• Reach Effect proportion of watershed obstructed
  by specific xing

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Prioritization FactorsRisk
Barrierity Proportion of the design flow that
the design fish is unable to pass through the
culvert. (Juvenile Barrierity Adult Barrierity)
/ 2 Provides a value between 0 and 1
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Prioritization FactorsRisk
Species Richness Anadromous vs. Resident Stream
Reach Proportion of obstructed stream reach that
is anadromous. Anadromous obstructed stream
length / total obstructed stream length Provides
a value between 0 and 1
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Prioritization FactorsRisk
Watershed Scale Effects Cumulative Effect
(CE) proportion of watershed obstructed by all
xings in watershed. Total length of obstructed
habitat in watershed divided by total potential
habitat in watershed. Reach Effect (RE)
proportion of watershed obstructed by specific
xing. Length of obstructed habitat upstream of
specific xing divided by total potential habitat
in watershed. Watershed Scale Effects (CE
RE) / 2 Provides a score between 0 and 1
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Prioritization FactorsRisk
Risk Barrierity Species Richness Watershed
Scale Effects / 3 Provides a value between 0 and
1
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Prioritization Factors
Intrinsic Potential of Habitat
Remediation Prioritization and No Remediation
Threshold Determination
Efficacy
Risk
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Prioritization FactorsEfficacy
Efficacy The capacity to produce the desired
effect. .fish passage
Factors Monetary Cost Probability of Success
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Probability of Success

• Probability of Success is the likelhood that a
  fish passage replacement structure will provide
  AOP and perform as designed.
• Factors effecting Success
• Gradient -
• Stream Width small stream are more difficult
  then larger stream due to water losses (thru fill
  and intergranular flow)
• Woody debris dominated and fine grained systems

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Probability of Success
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Cost Factor Calculation
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Efficacy Score
Efficacy is defined as the capability of
producing the desired outcome.
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Decision Cube
Priority Increases
Increase
Efficacy
Increase
Increase
Risk
Habitat Potential
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Priority Score for the CUBE
Priority Score Distance from origin
Priority Score (Xorigin-X2)2
(Yorigin-Y2)2 (Zorigin-Z2)2
X Habitat Potential Y Efficacy Z Risk
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