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COMPREHENSIVE FLOODPLAIN MANAGEMENT : Promoting Wise Uses of Floodplains

CA Department of Water Resources/ CIFMCG Workshop. COMPREHENSIVE FLOODPLAIN MANAGEMENT : Promoting Wise Uses of Floodplains. July 2006. Comprehensive Floodplain Management Workshop. Flood Management Economic Analysis. Workshop Modules. Comprehensive FPM NFIP Overview

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COMPREHENSIVE FLOODPLAIN MANAGEMENT : Promoting Wise Uses of Floodplains

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  1. CA Department of Water Resources/ CIFMCG Workshop COMPREHENSIVE FLOODPLAIN MANAGEMENT: Promoting Wise Uses of Floodplains July 2006

  2. Comprehensive Floodplain Management Workshop Flood Management Economic Analysis

  3. 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

  4. Flood Management Economic Analysis • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis • Flood damage analysis models • Multi-objective analysis

  5. Flood Management Economic Analysis • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis • Flood damage analysis models • Multi-objective analysis

  6. Role of Economic Analysis • Objective of an economic analysis--determine if a project represents the best use of resources over its life expectancy • Economic justification--total benefits > total costs based upon comparison of without and with project conditions • Key element of planning process: • Plan formulation • Evaluate feasibility of plans • Assist in decision-making

  7. Role of Economic Analysis • Economic analysis answers these questions: • Should the project be built at all? • Should it be built now? • Should it be built to a different configuration or size? • Will it have a net positive social value?

  8. Role of Economic Analysis • Financial analysis answers questions • Who should pay? • Do they have the ability to pay? • It’s possible to have a project that is economically feasible and financially infeasible or vice versa

  9. Role of Economic Analysis • Economic analysis methods: • Benefit-cost analysis: benefits and costs of proposed projects are measured over the life of the project • Cost-effectiveness analysis: determines the most cost-effective approach of achieving a given objective ($/unit) • Socioeconomic impact analysis: measures changes in regional population and economic activity

  10. Flood Management Economic Analysis • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis • Flood damage analysis models • Multi-objective analysis

  11. Federal Water Resources Planning Guidance • Federal agencies involved in water resources planning must followEnvironmental Principles and Guidelines for Water and Related Land Resources Implementation Studies (US Water Resources Council, March 1983) • US Army Corps of Engineers • US Bureau of Reclamation • Natural Resources and Conservation Service • Tennessee Valley Authority

  12. Federal Water Resources Planning Guidance • Federal objective: “..to contribute to national economic development (NED) consistent with protecting the nation’s environment, pursuant to national environmental statues, applicable executive orders, and other federal planning requirements.”

  13. Federal Water Resources Planning Guidance • P&G establish four accounts: • National Economic Development (NED) • Environmental Quality (EQ) • Regional Economic Development (RED) • Other Social Effects (OSE)

  14. Federal Water Resources Planning Guidance • National Economic Development (NED)--economic value of the national output of goods and services • Water supply • Flood damage reduction • Navigation • Hydropower • Recreation • Commercial fishing

  15. Federal Water Resources Planning Guidance • Environmental Quality (EQ)-- effects on significant natural and cultural resources • Ecosystem restoration • Preservation of historical resources • Preservation of aesthetic resources

  16. Federal Water Resources Planning Guidance • Regional Economic Development (RED)--effects on regional economic activity • Income • Employment • Population

  17. Federal Water Resources Planning Guidance • Other Social Effects (OSE)—all other “relevant” effects • Urban and community impacts • Life, health and safety • Displacement • Long-term productivity • Energy requirements

  18. Federal Water Resources Planning Guidance • NED account is required • Other information that is required by law or which will have a “material bearing on decision-making” should be included in the other accounts • Agencies can establish their own specific guidance based on P&G

  19. Federal Water Resources Planning Guidance • Benefit-cost analysis is required for formal economic analysis of federal programs or projects • Criteria: • Maximum net benefits—Maximize the present value of benefits minus the present value of costs • B/C Ratio—the ratio of the present value of benefits to the present value of costs; must be greater than 1.00

  20. Federal Water Resources Planning Guidance • Corps planning criteria: • Completeness—an alternative must not rely on other activities to function • Effectiveness—an alternative must contribute to at least one of the project’s planning objectives • Efficiency—an alternative must be cost-effective • Acceptability—an alternative must be considered by the general public to be a satisfactory way of addressing identified problems

  21. Federal Water Resources Planning Guidance • Corps plans: • National Economic Development—single purpose plan such as flood damage reduction, water supply, navigation, etc. • Ecosystem Restoration—single purpose ecosystem restoration plan • Combined Plan—combines NED and ER purposes • Locally Preferred Plan—recommended by local agencies; may require additional funds from local agency

  22. Flood Management Economic Analysis • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis • Flood damage analysis models • Multi-objective analysis

  23. Flood Damage Reduction Analysis • Types of flood damage: • Physical damage (structures, utilities, autos, crops, etc.) • Income loss • Emergency costs • Lost value of public agency services (police & fire protection, hospitals, etc.) • Lost taxes (property and sales) • Injuries and loss of life • Social disruption

  24. Flood Damage Reduction Analysis • Flood damage can be expressed • Event damage: the damage expected to occur from specific flood events (examples: 10-, 50-, 100-year events); used for emergency planning • Expected annual damage: the “average annual” damage for all events that could be expected to occur in any given year; used for project B/C analyses

  25. Flood Damage Reduction AnalysisExample: Event and Expected Annual Damage Source: USACE, Lower Cache Creek Feasibility Study, 2003

  26. Flood Damage Reduction Analysis Damage ($) Expected Annual Damage 0.002 0.005 0.01 0.02 1.00 Frequency

  27. Flood Damage Reduction Analysis Models • Corps HEC-FDA • Expected annual damage used in benefit-cost analysis • Project performance statistics used in risk analysis and levee certification • Incorporates uncertainty using “Monte Carlo” procedures www.hec.usace.army.mil/software/hec-fda/hecfda-hecfda.html

  28. Flood Damage Reduction Analysis Models • HEC–FDA Project Performance Statistics • Expected annual exceedance • Long-term risk • Conditional non-exceedance

  29. Flood Damage Reduction Analysis Models • Expected annual exceedance • The annual probability of flooding taking into account all different types of events • Example: 0.10 or 10% chance of flooding in any given year

  30. Flood Damage Reduction Analysis Models • Long-term risk • The probability of flooding over a long period of time • Example: 0.30 or 30% over a 25 year period

  31. Flood Damage Reduction Analysis Models • Conditional non-exceedance • The probability of passing a specified flood event • Example: 90% probability of passing a 100 year event • Used in certifying levees

  32. Flood Damage Reduction Analysis Models • FEMA HAZUS • GIS-based program • Can be used to asses flooding, hurricane and earthquake hazards • Default hydraulic and structural inventories for communities included in its databases • www.hazus.org • FEMA Riverine B/C Software • Spreadsheet-based program • Hazard Mitigation Grant Programs • bchelpline@dhs.gov

  33. Flood Management Economic Analysis • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis • Flood damage analysis models • Multi-objective analysis

  34. Multi-Objective Analysis • Agencies, ASFPM are advocating MOM projects • Achieve multiple benefits at lower costs • Greater support from diverse groups of stakeholders • More likely sources of financial support

  35. Multi-Objective Analysis • Monetary values can be assigned to most water management benefits (water supply, flood damage reduction, hydropower, etc.) • Multi-objective projects often include ecosystem restoration • Problem—how do we evaluate ecosystem benefits?

  36. Multi-Objective Analysis • Three approaches for including ecosystem benefits in economic analysis: • Cost-effectiveness ($/unit) • Tradeoff analyses (assign “points” to unit and $ benefits) • Benefit-cost analysis ($’s)

  37. To Monetize or Not to Monetize Ecosystem Benefits? • Decision depends upon: • Agency guidance • Available data (quantity/quality environmental outputs) • Identify/quantify environmental outputs and link with human services (water supply, flood damage reduction, recreation, etc.) • Comfort level (what’s a bunny worth??) • No approach is perfect!

  38. To Summarize… • This module has discussed • Role of economic analysis in water resources planning • Federal water resources planning guidance • Flood damage analysis and models • Intro to multi-objective analysis • More info on Federal and state (DWR) economics guidance can be found at: www.economics.water.ca.gov

  39. What’s Next? • Ecosystem Valuation Methods

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