King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Normative Flow Studies King County Department of Natural Resources.

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Presentation transcript:

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Normative Flow Studies King County Department of Natural Resources Water and Land Resources Division

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Establishing links between flow regimes and aquatic ecosystem health - Using a normative flow approach to guide river restoration in the PNW

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Flow Regimes and Restoration Historical conditions Ecological processes Prioritization Design

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Geology Climate Regional Vegetation Runoff regime Sediment supply LWD supply Land Use Pollution Roads CIP’s Floodplain Development Restoration/LWD Flow Regime Habitat Structure & Dynamics Biotic Condition (Salmon Viability)

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler GEOLOGY, CLIMATE Flow variables Unaltered flow regime Ecological Condition ‘Reference Condition’ Geomorphological, Biotic, Biogeochemical Variables Key Flow Variables Key Ecological Indicators

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Why has this not been done in PNW? Most information from: –Semi-arid/arid regions –Hydroelectric/irrigation diversions Single-species bias Focus on minimum flows ‘Noise’ associated with effects of urbanization Several efforts underway (TNC, King Co., Ecology….)

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Approach How have flows been altered? How has this impacted PNW rivers? Types of hydrologic alteration Ecological effects of flow alteration

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Predicted Ecological Effects Literature review –Focus on 1998-present –Most common flow alterations –Most common ecological responses –Empirical relationships What is relevant to PNW?

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Literature Review: Suites of Common Ecological Effects Q t Connectivity Life-history strategies Habitat complexity Community attributes

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Longitudinal Lateral Vertical Exchange of matter and energy: Flood pulse Nutrient cycling Productivity/food web support Access to habitats: Refugia All life-stages Population Viability: Dispersal Migration Recruitment Changes in Flows  Connectivity

Changes in Flow  Habitat Complexity Species Diversity Life-history Diversity Genetic Diversity Population Structure Population Persistence Productivity  Channel form  Patch complexity  Disturbance regime Complex, Diverse Simple, Uniform

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Changes in Flow  Life-history Q t Seasonality; Predictability; Variability Timing first floods Life-history strategies: Recruitment/spawning Life-spans, age at first reproduction Stable baseflows, drought

Changes in Flow  Communities Q t Seasonality; Predictability; Variability Community attributes: Diversity Range expansions/contractions Invasibility

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Evaluate Flow Changes: Indicators and Metrics Connectivity Habitat Complexity Life-history Traits Community Attributes

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Habitat Complexity Number of: Geomorphic surfaces Channel islands Un-vegetated patches Length channel segments Patch turnover rates Structural diversity Size classes trees Rates channel migration  Spatial  Temporal

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Life-History Traits Relative abundances/Presence-absence of life-history traits: –Timing of spawning runs –Number of runs –Length of reproductive season –Short-lived vs. long-lived species –Age at first reproduction –Generations/year –Tolerant/Intolerant

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Approach Can we use flow regimes to design better river restoration? Predict effects of flow alteration on river health Evaluate restoration actions under range of flow regimes

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Flow Regimes and Restoration Historical flow regimes/existing constraints Current flow regimes/limitations Prioritization Design Historical Feasible Stewardship, Enhancement Priority 2 Priority 1 Restoration

Timing of peak flows A-seasonal high or low flows ‘Flashiness’ Frequency overbank flows Prioritization

King County Normative Flow Project Parametrix, King County, Herrera, & Foster Wheeler Restoration Design Feasibility Potential for success Goals and targets Historical Feasible Stewardship, Enhancement Priority 2 Priority 1 Restoration

Frequency peak flows Magnitude peak flows Flow Regime Geomorphic Response Velocity Bedload transport capacity Depth of bedload scour (in relation to egg pocket depths) Grain size Biotic Response – Individual, Population Egg/alevin survival Population size (fall spawners) Salmon to cutthroat Invertebrate diversity Species diversity Life-history diversity Biotic Response – Community Composition