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CA Department of Water Resources/ CIFMCG Workshop. COMPREHENSIVE FLOODPLAIN MANAGEMENT : Promoting Wise Uses of Floodplains. July 2006. Comprehensive Floodplain Management Workshop. Natural Floodplain Functions, Services and Societal Values. Workshop Modules. Comprehensive FPM

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COMPREHENSIVE FLOODPLAIN MANAGEMENT : Promoting Wise Uses of Floodplains


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comprehensive floodplain management workshop

Comprehensive Floodplain Management Workshop

Natural Floodplain Functions, Services and Societal Values

workshop modules
Workshop Modules
  • Comprehensive FPM
  • NFIP Overview
  • FPM No Adverse Impact Strategies
  • Natural Floodplain Functions and Societal Values
  • Flood Management Economic Analysis
  • Ecosystem Evaluation Methods
  • Case Study
  • Technical and Financial Assistance
natural floodplain functions
Natural Floodplain Functions
  • Floodplain functions includes all the physical, chemical and biological processes that sustain floodplains
  • Floodplains perform a multitude of complex and interrelated functions which:
    • Provide biological support
    • Provide valuable goods and services to society
natural floodplain functions1
Natural Floodplain Functions
  • If we can identify “societal” goods and services, then we might be able to develop monetary values
  • If we can assign monetary values, then we can include them in economic analyses
  • Including them in economic analyses helps us better evaluate projects that include ecosystem restoration
floodplain functions services and societal values
Floodplain Functions, Services and Societal Values
  • Natural Floodplain Functions
    • Manage Flows
    • Maintain Water Supplies
    • Maintain Water Quality
    • Maintain Soil Quality
    • Maintain Air Quality
    • Maintain Plant and Animal Habitats
floodplain functions services and societal values1
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
manage flows
Manage Flows
  • Functions
    • Transport water, nutrients and organisms
    • Spread and retain surface and subsurface water
    • Moderate speed, force, depth and timing of flows
    • Maintain base flows
    • Maintain sediment balance
    • Maintain connectivity between channel and floodplain
  • Societal values
    • Protection of life and property
    • Avoided flood/sediment control infrastructure costs
    • Value of flow-related goods and services
manage flows1
Manage Flows
  • Examples
    • USACE estimate of annual wetland flood control benefits for Charles River, MA -- $17 Million/YR or $2,042/wetland acre
    • Minnesota DNR cost estimate to replace wetlands flood storage in the state -- $300/AF
    • Washington DNR cost estimate for a replacement storm water retention system equivalent to lost forestlands -- $2.4 Billion
    • The degradation of one mile of Louisiana coastal dunes ands vegetation could increase hurricane damage by about $64,000
floodplain functions services and societal values2
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
maintain water supplies
Maintain Water Supplies
  • Functions
    • Increase surface water storage
    • Promote groundwater recharge
  • Societal Values
    • Value of goods and services produced with additional water supplies
    • Avoid water supply infrastructure costs
maintain water supplies1
Maintain Water Supplies
  • Examples
    • USACE estimate of annual wetland water supply benefits for Charles River, MA – 100,000 gallons/day or
    • About $17 per day less than local district costs or
    • About a $6,000 annual savings in water supply costs
floodplain functions services and societal values3
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
maintain water quality
Maintain Water Quality
  • Functions
    • Filter nutrients and impurities from runoff
    • Process organic wastes
    • Moderate water temperature fluctuations
  • Societal Values
    • Value of goods and services produced with improved water quality
    • Avoid water treatment infrastructure costs
    • Avoid damages to plumbing, fixtures and appliances
maintain water quality1
Maintain Water Quality
  • Examples
    • Louisiana tidal wetlands provide $2,500 worth of water treatment benefits per acre/year
    • Charles River Basin wetlands can replace water treatment capital costs of $85/acre plus $1,475 in maintenance and operation costs
    • South Carolina wetlands provide a least cost substitute for a water treatment plant costing $5 million
    • Lake County (CA) estimates that the Middle Creek Ecosystem Restoration Project would remove up to 40% of the phosphorus entering Clear Lake
floodplain functions services and societal values4
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
maintain soil quality
Maintain Soil Quality
  • Functions
    • Detention of particulates, compounds and elements
  • Societal Values
    • Value of goods and services produced with improved soil quality
    • Avoid soil treatment costs
  • Examples
    • Seasonal flooding in the Cosumnes River floodplain provides benefits for the 1,000 + acres planted in organic rice and pasture
floodplain functions services and societal values5
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
maintain air quality
Maintain Air Quality
  • Functions
    • Removal of atmospheric carbon by vegetation (carbon sequestration)
    • Vegetation humidifies atmosphere and moderates air temperatures
  • Societal Values
    • Avoided air pollution treatment costs
    • Value of improved health and comfort
    • Improved property values
maintain air quality1
Maintain Air Quality
  • Examples
    • National Park Service estimates that the value of pollution removal by trees in Chicago is about $1 million/year
    • A single rural tree can remove up to 50 lbs of particulates per year
    • Trees can provide ambient temperature mediation and help reduce heating and cooling costs
floodplain functions services and societal values6
Floodplain Functions, Services and Societal Values
  • Manage Flows
  • Maintain Water Supplies
  • Maintain Water Quality
  • Maintain Soil Quality
  • Maintain Air Quality
  • Maintain Plant and Animal Habitats
maintain plant and animal habitats
Maintain Plant and Animal Habitats
  • Functions
    • Maintain characteristic and diverse plant and animal communities
    • Provide habitat interspersion and connectivity
    • Provide breeding and feeding grounds
    • Protect habitat for species of special concern
    • Maintain ecological succession
maintain plant and animal habitats1
Maintain Plant and Animal Habitats
  • Societal Values
    • Value of goods and services associated with habitats
    • Improved property values
    • Enhanced economic development
    • Preservation values
    • Avoided habitat enhancement/replacement costs
    • Recreation
maintain plant and animal habitats2
Maintain Plant and Animal Habitats
  • Examples
    • Urban stream restoration projects increased adjacent residential property values by $4,500 to $19,000
    • Riparian/wetlands restoration at new detention basins valued at $8,600 - $50,000/acre based upon regional mitigation bank costs
    • Riparian/wetlands habitat restoration valued at $3,200/acre based upon foregone commercial development opportunities of similar property sold to a land trust
maintain plant and animal habitats3
Maintain Plant and Animal Habitats
  • Examples (Cont’d)
    • Unit day values for recreational activities (exs: camping, $24; picnicking, $21; biking, $61; boating, $51)
    • Habitat restoration can stimulate economic development (exs: Napa, San Luis Obispo)
to summarize
To Summarize…
  • Floodplains perform a multitude of complex and interrelated functions which:
    • Provide biological support
    • Provide valuable goods and services to society
  • Functions include:
    • Manage flows
    • Maintain water supplies
    • Maintain water quality
    • Maintain soil quality
    • Maintain air quality
    • Maintain plant and animal habitats
to summarize1
To Summarize…
  • If we can assign monetary values to floodplain functions and services, we can include them in economic analyses
  • Including them in economic analyses helps demonstrate benefits for multi-objective projects
  • More info?? See DWR/EPA study reports at:

www.economics.water.ca.gov/documents.cfm

what s next
What’s Next?
  • Flood Management Economic Analysis