Portland International Airport Storm Water Master Plan June 22, - - PowerPoint PPT Presentation

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Portland International Airport Storm Water Master Plan

June 22, 2016

Susan Aha – Senior Manager, Water Resources Brian Freeman – Manager, Civil Engineering

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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)

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• 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

GUIDING PRINCIPLES

Why is Storm Water Important to Manage?

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Flooded Building at PDX

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Flooded Roadway at PDX

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PDX Drainage Basins

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PDX Drainage Basins

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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

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• 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

Storm Water Master Plan Goals

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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

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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

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Example of Failing Pipe

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• Program Structure
• Program Tools
• Program Resources

Storm Water Program Management

• Issues and Drivers
• Operation and Safety Risks from Ponding
• Compromised and Aging Storm Water Assets
• Regulatory Requirements Triggered by Development & Redevelopment

Storm Water Planning Objectives

• Existing Drainage System Overview
• Existing Water Quality Controls
• Drainage Basin Descriptions

Storm Water System Description

• Location-Specific Needs
• Location-Specific Solutions
• Storm Water Management Fact Sheets

Implementing Storm Water Improvements

PDX Storm Water Master Plan Document

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Airport-Wide Recommended Regional Storm Water Treatment Structures

15 PS#2 Broadmoor PS Outfall 1N Outfalls 1C and 1S

Basins 1&2: Wildlife Attractants, Complex Ownership, Undersized and Failing Infrastructure

16 Outfall 8

Basin 8: Wildlife Attractants, Undersized Infrastructure, Complex Ownership

17 Outfall 9 ODOT Outfall

Pipe Ownership Key City MCDD ODOT Unknown

I-205 Mays Lake MAX

Basin 9: Complex Ownership

18 Outfall 7

Basin 7: Undersized and Ageing Infrastructure

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New Basin 7 Pipe

(“Colwood Pipe”)

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Basin 7 Straw Pipe

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Basin 7 Straw Pipe –

5 Year Storm Event and 100% Collapse

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Hand Excavation for Diversion Culvert

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60 Inch Corrugated Metal Pipe

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Pouring Concrete for the Headwalls

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Functioning Pipe – Work Completed July 1936

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Conclusion