Portland Ecoroof Program

Portland Ecoroof Program

Sustainable Stormwater Division

Bureau of Environmental Services

City of Portland

Tom Liptan, Landscape Architect 503

823 7267

www.portlandonline.com/bes

Pollinator on Portland EcoroofCristo, my grandson

Portland, Oregon

Portland, Oregon 1804

Portland today

20 sq. miles rooftops

45 sq. miles pavement

Portland Tomorrow

35 sq. miles rooftops? sq. miles pavement

Total land/water area 140 sq. miles

Portland Industrial District

Conventional Roofs

High stormwater runoff volumes and peak flows.

Health issues; heat, glare, mosquitoes.

Roofs are fraught with problems Are they sustainable?

Ecoroofs on industrial buildings in Linz, Austria

Ecoroof

Ecoroof

Ecoroof

EcoroofEcoroof

Ecoroof

Ecoroof Design

Drainage Mats Drainage Channels

My Garage Ecoroof installed 1996

City of Portland Ecoroof Program

• Technical Assistance

• Outreach and education

• Industry Development

• Performance Monitoring

• Financial Incentives

• Zoning Code Bonus 33.510

• Cost and Technology Analysis

• Public Works Code Option 17.38

• City policy, ecoroofs on city owned buildings

• Partnerships: Academia, Building Owners, Industry, Trade Organizations, Regulatory Agencies

Dragonfly takes flight

from downtown ecoroof

Multnomah Co. Building before Ecoroof

Multnomah Co. Building with Ecoroof

Portland Building Ecoroof

Portland Building Mechanical Penthouse before EcoroofPortland Building Penthouse Before Ecoroof

Portland Building PenthouseEcoroof

Portland Building Ecoroof

Portland Building Ecoroof

M Financial Ecoroof

Swan Island Pump Station

Solar hot Water and PVs on Village Ecoroof

PV Units over ecoroofs

Turning Torso Building - Malmo, Sweden

Stormwater

Raingarden

Stormwater ManagementEcoroofs work; but not all are equal; is it the growing media (soil)?

• Ecoroof Annual Rainfall Retention– Hamilton west 58%: 4.5 inch media

– Hamilton east 24%: 2 inch media

– Garage 29%: 2 inch media

– Multnomah Building 15%: 6 inch media

– PSU Building 25%: 4 inch media

– Metro Ecoroof _?_: 3 inch media

– Portland Building Ecoroof 67%: 3 inch media

– OSU 26 Test Plots ? 4 inch media

• Ecoroof Peak Storm Intensity Mitigation– Hamilton west 97%: 4.5 inch media

– Hamilton east 90%: 2.5 inch media

– Multnomah Building 86%: 6 inch media

– Portland Building 93%: 3 inch media

• Ecoroof water quality– Hamilton east & west: high copper, zinc and phosphorous.

– Portland Bldg: copper, zinc, Lead and phosphorus.

25

City of Portland

Ecoroof Cost AnalysisTopics evaluated

» Stormwater Management (private)

» Energy

» Roof longevity

» HVAC (heating and cooling equipment)

» Stormwater (public)

» Carbon reduction

» Air quality

» Habitat

Topics to be addressed in future studies

» Urban Heat Island Reduction

» Carbon Sequestration

» Building Envelop and Acoustics

» Amenity

» Property value

» Open space

» Biodiversity

» Watershed Health

» Human Health

» Jobs and industry

Portland Grey and Green Initiative:

Natural Areas Restoration

Raingardens,

Green Streets,

Ecoroofs,

Urban Trees,

PORTLAND

ECOROOFS

square footage acreage number

Total Built 370,260 8.5 139

Grey to Green - post July 1, 2008

Known Potential 190,500 4.37 28

In Design 75,990 1.74 15

In Construction 95,650 2.2 9

Complete 100,188 2.3 12

Tabor School before rain-garden

Tabor School Rain-garden

Mt Tabor School Raingarden/Urban Cooling Garden

OMSI Parking Lot Stormwater Infiltration Swales

Drawn by: Kevin Perry

NE Siskiyou Green Street – Stormwater Curb Extensions

Before

After

Sandy Blvd - Infiltration Planter

Design 2005

Ecoroof

Sandy Blvd - Infiltration Planter 2007

(2001 Photo)

Tryon Creek Headwaters Project

Rain garden

Creek Restoration

Daylighted CreekEcoroof

Creek

Improvement Street Removed

Tryon Creek Headwaters

Apartments and Rowhouses

Tryon Headwaters - before

Tryon Headwaters - after

Does the city need this street and grass traffic separator?.

Street removed: New Creek, plantings still to be completed

Headwaters Raingarden

Headwaters Raingarden

Headwaters Raingarden

Headwaters Raingarden

Headwaters Raingarden and daylighted creek