stream functions pyramid · – channel form, habitat features, number of species – describes...
TRANSCRIPT
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Stream Functions PyramidStream Functions Pyramid
Will Harman, PG
t h it h iwww.s ream‐mec an cs.com
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We are at a 2nd Crossroad
Crossroad # 1
Traditional Channel Design Natural Channel Designg
Transport water quickly; Bed and banks don’t move
Create a dimension, pattern, and profile that transports water and sediment.
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Crossroad # 2
Restoration of Dimension, Pattern, and P fil
Restoration of FunctionsProfile
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What is a Stream Function?
“The physical, chemical, and biological processes that occur in ecosystems ” Cleanprocesses that occur in ecosystems, Clean Water Act (33 CFR 332.2; 40 CFR 230.92)
“ The processes that create and support a stream system.“ EPA Region 10y g
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Stream Function and Structure
• Structural measures evaluate stream condition at a point in timeat a point in time– Channel Form, Habitat Features, Number of SpeciesSpecies
– Describes “How the System Is.”
• Functional Attributes describe processes and• Functional Attributes describe processes and rates (per unit time)– Describes how the system is performing– Describes how the system is performing
Source: Palmer and Bernhardt, 2009
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Why do we need the Pyramid?
• So we don’t incentivize this result and we think about what we’re trying to achieve.
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• So we don’t miss key• So we don t miss key functions and processes during the design g gprocess.
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S d ’t d thi !• So we don’t do this!
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Why are we struggling with success?
W d ’ k h• We don’t ask why.– We don’t link functional lift to functional loss.
d ’ f h f• Because we don’t focus on what functions can be improved and how to restore those functionsfunctions.
• We don’t align the site selection with the functional goalsfunctional goals.– We’re not going to fully restore biological functions with severely degraded watersheds and patchworkwith severely degraded watersheds and patchwork restoration.
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So, what do we do?How can we use the Pyramid to help?How can we use the Pyramid to help?
To Create Better:
• Goals and Objectives
To Create Better:
• Function‐Based Assessment Protocols
• SOP’sSOP s– Debit and Credit Determination Methods
Success Criteria– Success Criteria
– Performance Standards
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To Create Better Goals and Objectives
• Common Goal
– Create a stable dimension, pattern and profile so that the , p pchannel doesn’t aggrade or degrade
• Better Goal
– Reduce sediment supply to improve native fish populations:
• Restore floodplain connectivity,
• Reduce streambank erosion• Reduce streambank erosion,
• Improve bedform diversity, and
• Establish a riparian buffer.
Objectives
Establish a riparian buffer.
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Functional Drivers for C and E Stream TypesC and E Stream Types
• Floodplain Connectivity
• Bedform Diversity
• Streambank Erosion (Lateral Stability)( y)
• Riparian Buffer
• Site Selection• Site SelectionAppropriate Watershed Condition.Adequate hydrology functions.
Requires
Reach scale versus watershed scale understanding.
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Quantitative Objectives
• Floodplain Connectivity• Floodplain Connectivity
– Reduce bank height ratios from 2.0 to 1.0.
– Increase entrenchment ratio from 1.2 to 3.0.Increase entrenchment ratio from 1.2 to 3.0.
• Bedform Diversity
– Convert riffle dominated bedform (95% riffle) to riffle‐pool sequence (70/30).
• Streambank erosion
R d i b 95%– Reduce erosion rates by 95%.
– Reduce erosion rates to reference reach condition.
• Riparian Buffer• Riparian Buffer– Increase buffer width from 0 feet to 50 feet.
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Framework for Function‐Based AssessmentsAssessments
• Functional AssessmentsF t li t d i id– Focus on parameters listed in pyramid
– Acknowledge the hierarchy
l d ff– Tailor to different regions
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Assessments for Different Reasons
• Mitigation Related
• Departure from Stability and Restoration Potential
• Watershed Management and Planning
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Assessments for Different Reasons
• Mitigation Related– Assess lost functions at permitted impact site
– Assess functional lift at mitigation site
– Basis for credit determination and performancep
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Assessments for Different Reasons
• Departure from Stability and Restoration Potential– Hydrologic Changes
– Geomorphic Assessments
– Physiochemical and Biological Healthy g
– Restoration Potential
• Watershed Management and PlanningWatershed Management and Planning
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Assessments for Different Reasons
• Watershed Management and Planning– Watershed scale
– ID healthy sub‐watershedsy
– ID unhealthy sub‐watersheds / reaches and the stressor
– Develop management plan to restore functions• Use all appropriate tools, like restoration, BMPs, preservation, etc.
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Framework for Mitigation SOPs
• SOPsM f t ti f di i tt d– Move from restoration of dimension, pattern, and profile to functions.
Better link between impact site and mitigation– Better link between impact site and mitigation site.
Applies to:– Applies to:• Debit and Credit Determination Methods
• Functional AssessmentFunctional Assessment
• Performance Standards
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Rural Piedmont: South Fork Mitchell RiverDarnell / Harman ReachDarnell / Harman Reach
• Not a mitigation project• Funded by the NC Clean Water Management Trust Fund
• Mitchell River Watershed Coalition and Surry Soil and Water Conservation District
• Watershed scale effort• Design by Michael Baker Corporationg y p
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Pre‐Restoration Condition
Wid d b k iWidespread bank erosionChannel is re‐adjusting pattern
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Pre‐Restoration Condition
Cross-section 7+50
FeatureStream Type BKF Area BKF Width BKF Depth
Max BKF Depth W/D BH Ratio ER BKF Elev TOB Elev
Riffle 76 27.77 2.74 4.16 10.15 1.5 >357.20 87.84 89.95
100
105
110
atio
n (ft
)
85
90
95
Ele
va
80600 650 700 750 800 850
Bankfull FloodproneStation (ft)
Moderately Incised. BHR = 1.5
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Pre‐Restoration Profile
108
South Fork Mitchell River - Longitudinal Profile
98
103
108
TW
LTOB
88
93
Elev
atio
n RTOB
WS
RBKF
LBKF
78
83
100 300 500 700 900 1100 1300 1500
BENCH
100 300 500 700 900 1100 1300 1500
Station
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Functional Lift
• Hydrology
H d li• Hydraulic
• Geomorphic
• Physiochemical
• BiologicalBiological
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Hydrology
• No lift– No change in rainfall / runoff relationship
– No change in design discharge (bankfull)g g g ( )
– No change in flow duration
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Hydraulics
• Floodplain Connectivity– Bank Height Ratio reduced from 1 5 to 1 0Bank Height Ratio reduced from 1.5 to 1.0
– Entrenchment ratio did not change
• Flow Dynamics• Flow Dynamics– Reduced average channel velocities
d d h f lb / f– Reduced shear stress from 0.85 to 0.67 lbs/sqft
– Reduced stream power
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Existing Reference Designg g
Floodplain Connectivity
Before AfterBefore After
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Floodplain ConnectivityDarnell Reach Post Construction 2003 2004 2005 2006 2007
90
92
94
Darnell Reach Post Construction 2003, 2004, 2005, 2006, 2007Cross-section 9+45 -- Riffle
84
86
88
Elev
atio
n (f
t)
80
82
0 20 40 60 80 100 120
E
Distance (ft)1/27/2003 3/26/2004 3/22/2005 3/29/2006 2/27/2007 Bankfull1/27/2003 3/26/2004 3/22/2005 3/29/2006 2/27/2007 Bankfull
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Geomorphic
• Sediment Transport CompetencyReduced average depth from 3 4 to 2 5– Reduced average depth from 3.4 to 2.5
– As‐built depth matches required depth
S di T C i• Sediment Transport Capacity– Not quantitatively assessed
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Geomorphic
• Channel Evolution– Pre‐restoration condition
• E moving towards a Gc – F – C –E
– Restored to a C/E/
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Geomorphic
• Lateral Stability– Did not do before and after BEHI assessments, ,which could be used for functional lift
– Used cross section surveys to show lateral stability y yafter restoration construction.
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Lateral Stability
94
Darnell Reach Post ConstructionCross-section 3+90 -- Pool
88
90
92
ft)
84
86
Elev
atio
n (f
80
82
0 20 40 60 80 100 120Distance (ft)
1/27/2003 3/26/2004 3/22/2005 3/29/2006 2/27/2007 Bankfull
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Bed Form Diversity
• Percent Riffle and Pool
P l D h V i bili• Pool Depth Variability
• Substrate Distributions
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R P i i 1Rosgen Priority 1
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Profile Design94
90
92
Bankfull
Bankfull & TOB86
88
Bankfull
80
82
84
76
78
80
0 200 400 600 800 1000 1200 1400 1600 1800
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fil Af iProfile After Restoration
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Percent Riffle and Pool
Bed Form Before Restoration Percentage
Year 5 Restoration PercentagePercentage Percentage
Riffle 51 46
Pool 49 54
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Cross Vane Too Highg
Downstream Cross Vane Upstream Riffle
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Substrate Variability
90
100
Darnell Reach Wide Sediment Distribution 2002-2007
Darnell 2003
50
60
70
80
ativ
e Pe
rcen
t Darnell 2004
Darnell 2005
20
30
40
50
Cum
ula
Darnell 2006
Darnell 2007
0
10
0
0.01 0.1 1 10 100 1000 10000Particles Finer Than (mm)
2002 B/4 Restoration
Particles Finer Than (mm)
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Pre and Post Beaver Dam
Summer 2008Winter 2008
Summer 2008
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Physiochemical Functional Lift
• Not measuredDO– DO
– Temperature
– pH
– Conductivity
– Nutrients
• Discussion
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Biological Functional Liftg• Primary Production – not measured
• Macroinvertebrate Communities– Ken Bridle, Ecologic
• Fish Communities– Stamper AquaticsStamper Aquatics
• Riparian Communities
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Macroinvertebrate Communities
Station 2003 2004 2005 2006 2007Total Number of Taxa
Project 35 54 46 31 51
Downstream 39 48 35
Station 2003 2004 2005 2006 2007Total Number of Organisms
Project 135 294 278 149 286
Downstream 186 362 184
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Fish Communities
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Volunteer Monitoring 2007‐8
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Riparian Communities
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Riparian Communities
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Wetland Communities
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Volunteer Wetland Monitoring
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Fun for the whole family …
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Mountain Stream ExampleMitchell River Mickey ReachMitchell River, Mickey Reach
• Drainage Area = 0.45 square miles
• Channel Slope = 3.5%
• Bankfull Discharge = 55 cfsBankfull Discharge = 55 cfs
• Bankfull Cross Sectional Area = 14 ft²
( )• D50 = 31 mm (Coarse gravel)
• Rosgen Stream Type = B4
• Design by Michael Baker Corporation
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Existing Condition
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Before Restoration Profile
Mickey Reach Profile Chart
500 TWLTOB
490
495
(ft)
RTOBWSRBKFLBKF
480
485
Elev
atio
n
470
475
1000 1100 1200 1300 1400 1500 1600 1700
7 pools out of 3,300 feet of channel
Station (ft)
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2005Before
2004
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2009 Ph t2009 Photos
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Pool to Pool Spacing / Bankfull Widthd T t l N b f P land Total Number of Pools
Year Min Max Total #
2002 1 >100 7 Existing Condition
2003 2 16 29
2005 0 5 9 53
As‐built Condition
2005 0.5 9 53
2006 0.5 9 50
2007 0.6 8 48
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Lower end of project
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Riparian Buffer
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Functional Summary
• Improved floodprone area connection in lower reach.– Converted G to B
• Improved bed form diversity– 7 pools to ~50 pools– Maintained pool to pool spacing
• Improved wetland / bog• Created riparian buffer
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Thank You