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Crafting Stormwater Programs. Oregon Coastal Planners Fall Network Meeting October 9, 2008 Florence Event Center Alissa Maxwell, PE. Major Stormwater Program Elements. Design Standards Development Review and Inspection Stormwater Master Plan and Management Plan Stormwater Utility

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crafting stormwater programs

Crafting Stormwater Programs

Oregon Coastal Planners Fall Network Meeting

October 9, 2008

Florence Event Center

Alissa Maxwell, PE

major stormwater program elements
Major Stormwater Program Elements

Design Standards

Development Review and Inspection

Stormwater Master Plan and Management Plan

Stormwater Utility


design standards
Design Standards


  • Requirements and Engineering Standards for new developments
  • Preserve water quality, protect downstream watercourses, limit erosion
  • Set a level playing field for proposed developments

Design Standards should be:

  • Consistent with Environmental Regulations
  • Regionally appropriate
  • Tailored to local community concerns
design standards1
Design Standards


  • Flow Control
  • Water Quality Treatment
  • Conveyance
  • Erosion Control


  • Calculation Methods
  • Low Impact Design
  • Source Control
  • Maintenance

Thresholds and Exemptions:

  • Flow control not appropriate near major waterways or ocean
  • 5,000 sf impervious or 1 acre total development
  • Reduced requirements for single lot developments
design standards2
Design Standards

Performance Based

  • Developer must prove certain outcomes will be met
  • Municipal staff must review and approve designs and analysis methods
  • Data intensive
  • High cost for every project

Design Based

  • Identifies a set of acceptable facilities, BMPs, and analysis methods
  • Developers know the rules ahead of time
  • Clearer review guidelines for municipal staff
  • Predictable, consistent requirements and costs
development review and inspection
Development Review and Inspection
  • Planning Submittal
    • General facility overview
    • Background Investigations – soils, wetlands, etc
  • Construction Plan Submittal
    • Engineering Details
    • Design Report
  • Inspections
    • Erosion and Sediment Control measures
    • Stormwater Facility Installation
    • Final Site Stabilization
stormwater master plan and management plan
Stormwater Master Plan and Management Plan
  • Stormwater Master Plan
    • Identifies Infrastructure needs now and in the Future
  • Stormwater Management Plan
    • Outlines Activities and Operations

Management Plan Topics:

  • Inventory and Mapping
  • Maintenance
    • Frequency, Standards, Budget, Staffing, Equipment
  • Capital Program
    • From Stormwater Master Plan, Needs Inventory, or Regional Planning
  • Public Education
  • Regulatory Compliance
stormwater utility
Stormwater Utility
  • Dedicated Funding Source
  • Separate Stormwater Program Operating Budget
    • Used for operations, maintenance, and capital projects
  • Increasingly Common in Pacific Northwest

Funding Sources:

  • Utility fee on all properties
    • Rates based on impervious coverage
    • Typically $4-$12/month per residential property
  • SDCs for new development
  • Grants, Loans, Bonds
  • Adopt Design Standards
  • Adopt Stormwater Master Plan and/or Management Plan
  • Establish Utility Structure and Rates
  • Prohibit Illicit Discharges
  • Establish Enforcement Authority

Model ordinances are available

next steps for coastal communities
Next Steps for Coastal Communities
  • Partner together to establish Design Standards
    • Cost and Time Effective
    • Consistent standards through the region
    • Base standards on accepted best practices and existing manuals
  • Adopt Ordinances and/or Stormwater Utility
    • Use model ordinances tailored to local needs
    • Widespread adoption helps develop community and council support
  • Partner to develop and distribute educational material

EPA Training Webcasts

Free live and archived webcasts on stormwater program topics.

Stormwater Manager’s Resource Center

Technical tools and resources; slide shows, manuals, checklists, and model ordinances.

Center for Watershed Protection

Research, design manuals, program guidelines, and model ordinances.

Puget Sound Partnership

Publications from the Puget Sound Action Team – the leading resource for low impact development guidance in the Pacific Northwest.

resources design manuals
Resources: Design Manuals

City of Portland BES Stormwater Management Manual

Clean Water Services Design and Construction Standards

Stormwater Management Manual for Western Washington

ODOT Hydraulics Manual

DEQ Erosion and Sediment Control Manual

Rogue Valley Stormwater Quality Design Manual

Central Oregon Stormwater Manual

contact information
Contact Information

Alissa Maxwell, PE

Water Resources Engineer | Otak, Inc

541.385.9960 |