Portland International Airport Storm Water Master Plan April 6, 2016 Susan Aha Senior Manager, Water Resources Brian Freeman Manager, Civil Engineering 1
Presentation Overview Why is storm water important to manage? PDX storm water drainage basins Storm Water Master Plan consultant team and goals Connection to PDX Master Plan (Airport Futures) Storm Water Master Plan outcomes Storm water treatment structures Key drainage basins with issues (1, 2, 7, 8, and 9) 2
GUIDING PRINCIPLES Why is Storm Water Important to Manage? Rainfall generates storm water runoff At PDX storm water flows south to the Columbia Slough which is managed for flood control by the Multnomah County Drainage District (MCDD) Storm water quality and quantity at PDX is primarily regulated by Oregon Department of Environmental Quality National Pollutant Discharge Elimination System (NPDES) permits (delegated by EPA): 1200-COLS Municipal Separate Storm Sewer System (City & Port are co-permittees) Deicing 3
Flooded Building at PDX 4
Flooded Roadway at PDX 5
PDX Drainage Basins 6
PDX Drainage Basins 7
Storm Water Master Plan Consulting Team Lead: Gresham, Smith and Partners (GSP) PDX Hydraulic analyses (PDX) Sub-consultants: Geosyntec Consultants: Pollutant analyses HDR Engineering: Marine hydraulic analyses Good Company (ESB): Sustainability and best management practices Zenn Associates (ESB): Outreach Timeline: Contract awarded January 2013 Work completed June 2015 8
Storm Water Master Plan Goals Comply with MS4 and 1200-COLS permit requirements for water quality and quantity Address surface flooding and wildlife attractants Plan for future development and redevelopment Identify aging infrastructure and develop database to support development of an asset management program Develop recommended list of projects for storm system modifications 9
Interrelationships 1. Evaluate existing and future conditions based on: PDX Master Plan Port strategic goals and policies Regulatory requirements Safety Sustainability Natural resources 2. Integrate solutions into short-term and long-term planning and facility management: Capital projects Operations and Maintenance (O&M) projects and activities 10
PDX Drainage Basins and Storm Water Master Plan Outcomes Functioning Well: Basins 3, 4, 5, and 6 Undersized and aging infrastructure: Basin 1, 2 and 7 Wildlife attractant issues: Basins 1, 2, and 8 Complex ownership: Basins 1, 8, and 9 Relatively new undersized infrastructure: Basin 8 Storm water treatment needed: All basins 11
Example of Failing Pipe 12
PDX Storm Water Master Plan Document Storm Water Program Management Program Structure Program Tools Program Resources Storm Water Planning Objectives Issues and Drivers Operation and Safety Risks from Ponding Compromised and Aging Storm Water Assets Regulatory Requirements Triggered by Development & Redevelopment Storm Water System Description Existing Drainage System Overview Existing Water Quality Controls Drainage Basin Descriptions Implementing Storm Water Improvements Location-Specific Needs Location-Specific Solutions Storm Water Management Fact Sheets 13
Airport-Wide Recommended Regional Storm Water Treatment Structures 14
Basins 1&2: Wildlife Attractants, Complex Ownership, Undersized and Failing Infrastructure Outfall 1N Outfalls 1C and 1S 15 Broadmoor PS PS#2
Basin 8: Wildlife Attractants, Undersized Infrastructure, Complex Ownership 16 Outfall 8
Basin 9: Complex Ownership I-205 Mays Lake MAX Outfall 9 ODOT Outfall Pipe Ownership Key City MCDD 17 ODOT Unknown
Basin 7: Undersized and Ageing Infrastructure Outfall 7 18
New Basin 7 Pipe ( Colwood Pipe ) 19
Basin 7 Straw Pipe 20
Basin 7 Straw Pipe 5 Year Storm Event and 100% Collapse 21
Hand Excavation for Diversion Culvert 22
60 Inch Corrugated Metal Pipe 23
Pouring Concrete for the Headwalls 24
Functioning Pipe Work Completed July 1936 25
Conclusion 26