Lower Columbia River Field Guide to Water Quality Friendly Development
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Reduced Impervious Surfaces

Narrow or shared driveway
Narrow parking lot spaces
Narrow travel lanes


Permeable Surfaces

Permeable pavement
Permeable pavers
Turf block
Gravel
Cobbles

Roof Systems
Ecoroof
Roof garden

Rainwater Harvesting Systems
Rain Barrels
Cisterns

Landscape Systems
Trees
Contained planter box
Infiltration planter box
Flow-through planter box
Vegetated/grassy swale
Vegetated filter strip
Vegetated infiltration basin
Sand filter


Subsurface Systems

Soakage trench/dry wells/French drain

Conveyance
Downspout disconnection
Curb alternatives


   

Trees

Site:
Buckman Terrace
Owner:
Pendergast and Associates
Address:
303 NE 16th Avenue
Contact:

 

Comments:
Pendergast and Associates went out of their way to save these large street trees in NE Portland. Street trees have been proven to significantly reduce stormwater impacts. Large, evergreen, or broad leaf trees tend to capture the most rainfall.


Site:
Irvington Neighborhood
Owner:

Address:
NE Portland’s Irvington Neighborhood
Portland, OR 97212
Contact:
Sara Murphy
503.281.1132

 

Comments:
In many older neighborhoods large street trees are the norm. However, many cities now limit the size of street trees – requiring much smaller trees to minimize interference with wires and sidewalks. While valid concerns, large trees do a much better job of capturing and holding rainfall in leaves and braches, allowing for high levels of evapotranspiration and absorption.



Site:
Irvington Neighborhood
Owner:

Address:
NE 21st Avenue and Brazee
Portland, OR 97212
Contact:

 

Comments:
In addition to their stormwater benefits, trees have many other environmental advantages, including lowering air temperature and improving air quality.


Site:
SE Portland
Owner:

Address:
SE Portland
Contact:

 

Comments:
Even relatively young trees can provide the broad canopy that help capture and hold rainfall. On this SE Portland street, street trees on both sides of the street easily form a nice canopy. In addition to their stormwater benefits, trees also provide habitat, aesthetic appeal, visual screening, and windbreaks. They also increase property values.


Site:
Treeless Street
Owner:

Address:
Many neighborhoods throughout the lower Columbia River area
Contact:

 

Comments:
Streets without trees are often less visually attractive and are missing out on an easy affordable way to benefit the environment.