Tag Archives: climate change

Sustainable Stormwater Management by Tom Liptan

Sustainable Stormwater Management – a Review

March 8, 2018

Sustainable Stormwater Management: A Landscape-Driven Approach to Planning and Design

Sustainable Stormwater Management: A Landscape Driven Approach to Planning and Design

Preview the book at Timer Press: http://www.timberpress.com/books/sustainable_stormwater_management/liptan/9781604694864

by Thomas Liptan, with writer David Santan, Jr

strikes an optimistic note about the future of our cities in an era of climate change:

Indeed, the cities of the future will be garden cities. Not for aesthetics, though beauty will follow as a by-product, but for the energy savings, water management, shelter from extreme heat and precipitation, noise buffers, and perhaps most importantly the habitat and urban wildlife these plants will support. Our cities will come alive with people, plants, and creatures thriving in interdependent coexistences” (p252)

Primary author, Tom Liptan, is hoping to change the nature of urban design itself.  As a sustainable cities advocate, such change is a vision that I share.

Liptan adds yet another term to the sustainable stormwater management lexicon: landscape stormwater management. No American city has implemented more of these LSM approaches than Portland, Oregon (where they both live—as does this reviewer). Portland has roughly 7,000 green stormwater facilities in place—including a few in its downtown! They not only manage stormwater, they “conserve water and energy, reduce urban heat island effect and thermal gain in waterways, recharge groundwater supplies, create habitat and support biodiversity, buffer noise, and provide a healthier, more adaptive, more resilient infrastructure”(p18). I will add that they make a walk or bike ride more pleasant and interesting and they are cheaper and more effective than pipes as well!

Tabor 2 River Green Street

This Green Street planter at SE 41st & Clay is one of Portland’s 7,000 landscape stormwater facilities. The Tabor to the River project where this street lies https://www.portlandoregon.gov/bes/47591 saved the city $63M and added multiple benefits. Image by PlanGreen, taken Winter 2018.

I first met primary author, landscape architect, Tom Liptan, in the early 90’s when he gave a presentation for a local builders group on green roofs in Europe. He issued a call for us to start applying green roof technology in Portland. Ultimately, Liptan became the Ecoroof Technical Manager in the Sustainable Stormwater Division of the City’s Bureau of Environmental Services (BES). Today we participate together  in Portland’s Green Roof Info Thinktank (GRIT). He and I were early advocates for restoring Portland area streams—a movement that gave impetus to the practices in this book.

This book is not just about Portland and its 7,000 LSM facilities. It’s about a design philosophy that puts the water in the landscape rather than storm drains and pipes. And it uses examples of LSM design from all over the world. Although it has lots of information you’d find in a manual: site assessment, site design, construction, inspection, cost considerations, operations and maintenance—it’s style and unusual organization makes it far more interesting than most manuals or handbooks.

As a professional who has long-criticized gizmo green, I appreciate Liptan’s statement that “a good designer relies on principles of design rather than products.” He won my heart when he exhorts us to “look first to native materials and natural systems” and employ “Design with native plants first and foremost.” It’s not immediately apparent to me that many designers in Portland actually do that—so Liptan and I have a lot more exhorting to do. I’m hoping this book and my review will help.

Sustainable Stormwater Management is organized into two major sections: Landscape Stormwater Design: Water Management from a Landscape Architectural Perspective and Landscape Stormwater Management: Vegetative Approaches to Water Management. The four chapters of the first section cover guiding principles, economics, policy and politics and something of an exhortation to the landscape architecture profession that Liptan sees as the potential leaders of this movement.

It is true that landscape architects have a jealously-guarded stranglehold over specifying plants in commercial facilities in Oregon. As a streams and natural areas restoration volunteer and native plant/ecology focused tour leader, I throw up my hands about this stranglehold every time I examine a rain garden or stormwater planter facility in Portland and see mostly over-used, alien ornamental species—some of which are invasive elsewhere. And I’ve spent much time reporting deliberately planted INVASIVE species in the past.

I now advocate that only those trained (formally or informally) in ecological restoration be allowed to design Portland’s stormwater facilities. (Just like most architects get little training in urban design, most landscape architects get little training in plants before they get their credentials—though the latter seems to be a more tightly kept secret.) Liptan admits this later in the book: Addressing the engineering, architecture and landscape architecture disciplines: “Water, soil and plants as stormwater management elements are new territory and we all have a lot to learn”(p249). “Good designers are not born but educated. . .Better education for designers and city review staff can reduce the waste of money and space.” (p250) Portland would do well to reward and learn from those of us who agree with Liptan.

The far longer second section, Landscape Stormwater Management: Vegetative Approaches to Water Management, has most of the data, tables, rules of thumb and cautions that you might find in a manual. But, with its pleas for further research, rallying cries for creative approaches, page-after-page of captioned photos and its call to design with nature using native materials, this book goes beyond a manual.

Sandy Boulevard Rain Garden

Sandy Boulevard Green Street Rain Garden in Hollywood Neighborhood of Portland. Image by PlanGreen.

Chapter 5—Water-Accepting Landscapes—is the chapter that covers Rain Gardens and Stormwater Planters, Green Streets, and Rainwater Harvesting amongst other topics. Liptan barely uses the term bioswale conceding that it is like a long rain garden. Rather he distinguishes between rain gardens with their sloped sides and planters with their vertical structural sides. Besides that there are three types of either system: 1) infiltration landscapes, 2) partial infiltration landscapes, and 3) flow-through landscapes.

Although Liptan devotes only a half page of text under the heading “Green Street” he does have ten pages with captioned photos of green streets.   The reader can find more green street commentary in his discussions of Nashville’s Deaderick Street, Seattle’s SEA Street, Ballard (Seattle) Roadside Rain Garden Project, Portland’s Tabor to the River, Halsey Green Street and Headwaters at Tryon Creek projects. In fact much of the latter half of Chapter 5 on Site Design is devoted to making green streets work better—covering such areas as site assessment, sizing, directing flows, plantings and soils, construction, plumbing, cost considerations and operations and maintenance (O&M). (Although I understand “The intent is to focus on the outcome of the approach rather than a specific type of implementation. . .,” I found this organization a bit confusing.)

I’ve long been impressed by Tom Liptan’s minimalist approach: “The ideal LSM design should never need irrigation, pruning, or fertilization.” He cautions that O&M plans must state explicitly how plantings should be managed, otherwise most landscape contractors will default to their standard approach: “Spray it, soak it, mow it, blow it away.” Ninety percent of street planters in Portland are not irrigated—resulting in huge O&M savings. (However, as a Green Street Steward in downtown Portland, last summer I was begging nearby retailers to water the downtown planters I steward so that they wouldn’t lose any more plants.)

Most of Chapter 6—Vegetative (Living) Cover of Impervious Surfaces—is devoted to what Portland

Central Library Ecoroof in downtown Portland

Central Library Ecoroof in downtown Portland. Image courtesy of Timber Press.

calls ecoroofs, with Liptan using the more generalized term “vegetative roofs” to appeal to a wider audience. However he moves through vegetative walls, vegetative planters, trees, and vines before returning to research on vegetative roofs and then to their design.

He is again minimalist: Simpler vegetative roof designs found in Europe are “as good or better than most North American designs.” I would be disappointed if I didn’t see the Red Cinder Ecoroof design that Liptan developed in Portland. It’s comprised of a moisture mat, soil, and sedums planted in red cinder mulch. It’s low cost, low-maintenance, self-sustaining with no irrigation and adaptable to any roof or membrane system AND it protects the roof membrane, manages stormwater and creates habitat. “The sedums with the red cinder retard colonization by other plants for many years,” maintains Liptan.   Some additional recommendations he makes for vegetative roofs: 1) some kind of mineral mulch if not red cinder—for both moisture retention and shading the soil; 2) integrate solar panels on your roof so the plants can benefit from the shade; 3) manage solar reflections on vegetation where possible—one solution is to cover dead plants with a thin layer of rock to protect the soil and perhaps allow some plants to return.

Tanner Springs Park

Tanner Springs Park doesn’t really daylight Tanner Creek, just replicates such daylighting. But the nearby nature it brings in is great for education. Image by PlanGreen.

Chapter 7 asks the reader to think about how much impervious surface we really need then moves on to discussing porous pavement, depaving and stream daylighting. Liptan sees a bright future for buried creeks to reappear in our cities proclaiming that “A daylighted stream can be the nexus for the dramatic green transformation of an entire neighborhood.” Both the daylighting and depaving movements have been led for many years by unpaid volunteers who have formed non-profits and enlisted more volunteers to get the work done. I’m glad to see Liptan exhorting design professionals to do more in this arena.

Liptan’s is a captivating vision for change in the way we design/re-design our cities. I hope more designers and advocates too will take to heart a fragment from the book that is going up on my bathroom mirror: “…the door to creativity stands open. Enter unencumbered by the boxes of conformity, and be amazed.”

____________

Mary Vogel is a CNU accredited planner and founder of PlanGreen, a Woman Business Enterprise in Portland, OR that has paddled upstream for years to bring ecosystem services to excellent urban design. After achieving on-the-ground restorations and some important policy accomplishments in several of Portland’s and the region’s long-range plans pro bono, she would like to get paid work—perhaps outside of Oregon where she can best use her skills.

PlanGreen’s City Council Priorities – Fossil Fuels and Housing

Jan.6, 2017

On November 9, the day after what for me was a cataclysmic election, and on most Wednesdays and Thursdays until the end of 2016, I found a haven in Portland City Council meetings.  Not only did I take solace in offering testimony myself, but cheering on the testimony of citizens as young as GRADE SCHOOL age.  Most of us–certainly the young– wanted Portland to not only continue, but increase its progressive agenda.  The last Council accomplished much in those final two months, but there is still plenty left to do.  Inspired by former mayoral candidate, Sarah Iannarone, I offer my own TO-DO list for Mayor Ted Wheeler and the new City Council.

Sunnyside School Student Testifying before Portland City Council, Nov. 9, 2016.

Sunnyside School Student Testifying before Portland City Council, Nov. 9, 2016. PlanGreen

In 2017, let’s help the City of Portland continue its leadership on climate change by addressing fossil fuels–both by reducing demand and by limiting their usage, transport and storage in Portland.  We also need to divest the city’s money in them¹.

Reducing Demand for Fossil Fuels

  • Make every neighborhood more walkable. This includes
    • Adopt strong Residential Infill/Missing Middle policy to create the population levels to support the services in each neighborhood that folks want to walk to.
    • Adopt Parking Management Policy improvements that help to manage demand–the type sought by Portlanders for Parking Reform and PBOT’s own Citywide Parking Strategy and its proposed Residential Parking Permit Program.
    • Strengthen the Central City 2035 Plan re: trees and streetscape adding to the plan wider sidewalks and street trees to make downtown streets more than car sewers for commuters. (BTW, while I appreciate the need to give more focus to East Portland, as Iannarone suggests, the West End of downtown still has a predominantly low-income population, many of whom are people of different ethnic origins and races. And many use walkers or wheelchairs.)
    • Insist on a revision of the Portland Art Museum Rothko Pavillion plan seeking to close off Madison Street plaza. Instead, focus on strengthening downtown walkability and resilience–e.g. negotiate a “Madison Walkway” between SW 11th and 12th to break up this superblock.  Oppose any other property owner proposing to make downtown less walkable rather than more walkable!
  • Since the greenest building is one that is already there, work with the Unreinforced Masonry Building owners in the West End—including the Art Museum—to do seismic upgrades so that fewer buildings need to be replaced after a seismic event. (PAM is not technically a URM, rather brick veneer; however, it was built in the 1930s and has not been seismically upgraded to today’s standards.)
  • Phase out the use of studded tires that are the #1 cause of road damage and hence asphalt resurfacing—a very intensive use of fossil fuels. [I know that this is a State issue, but Portland must add this to its Legislative Agenda–see Preserving Oregon’s Roads.

Limiting Fossil Fuel Transport and Storage 

Sierra Club and 350 PDX (I’m an active member of both) have played a leadership role here–along with my friends at Center for a Sustainable Economy.  I testified at the last Council’s hearings on the no new Fossil Fuel Facilities policy and stand ready to help defend it–and to help Portland get enabling legislation to REQUIRE seismic upgrades on existing fossil fuel storage facilities.

The Housing Crisis

  • In the absence of other immediately available options, partner with the member organizations of the Village Coalition  to find additional spots where the homeless can self-organize into “tiny house villages”. This way we’ll waste less human energy—releasing it to help in the climate change effort.
  • Ban no cause evictions and pursue other tenants’ rights policies in Mayor Wheeler’s Tenants Bill of Rights published during the campaign.
  • Support the Community Land Trust concept that seeks to take housing off the private commodity speculative market and put it into public trust.  This model gives participants security, equity and legacy in their housing.  Over 50 years ago, the founders of the CLT concept saw this as a new model for land tenure in America–not just a band-aid to the system to help the low-income.  I’d like to see the City of Portland help its own CLT, Proud Ground, revive the idea that there is a new model of housing for all incomes–one that has a tremendous body of law and practice already established.

Portland needs to nurture the budding activism of the school children and Millennials who gave testimony on a variety of climate-related issues over the past year by re-doubling on its progressive policy.  As Tavis Smiley admonishes on PBS “Keep the Faith!”

¹I hope that our efforts will inspire those in other cities–especially Millennials–to work locally to get their own cities do likewise–making those cities more sustainable and resilient too.  As much as I value Millennials’ migration to our city, I know we need them more in places where the fight may seem harder.

Mary Vogel is founder and principal of PlanGreen and a downtown neighborhood land use and transportation advocate.

Mycoremediation with “Spongy Parking Lots”

Aug 2, 2015

Portland’s Old Town China Town neighborhood has an abundance of surface parking lots.  In fact, it has far too many to be a vibrant neighborhood much less an expression of the eco-city that Portland purports to be.  I’ve joined with five other professional women to try to change that.  If we can’t see these central city lots immediately redeveloped to higher and better uses that house people and businesses, we at least want to see them become better parking lots–SPONGY PARKING LOTS.

Spongy Parking Lots Video image

Image borrowed from PDX Downtowner You Tube site.

My friend, Ruth Ann Barrett coined that term and even made a video about Spongy Parking Lots to share with her neighbors in Old Town/Chinatown.  She has friends who visit from California and she’s embarrassed to show them how much we waste water here in Portland.  When it rains, the water from those parking lots heats up and captures whatever pollutants vehicles leave behind on its way to the nearest storm sewer.  The surface parking lots are paved in asphalt and are major contributors to the urban heat island effect that raises the temperature as much as 10° over areas with open land and vegetation.  In turn, the extra heat increases the energy needed to cool interior spaces, and puts an extra strain on the grid by exacerbating peak energy loads and hence carbon footprint/climate change. It also contributes to smog formation adding even more public health impacts resulting from excessive outdoor temperature.

Spongy trail in an old growth forest. Photo by PlanGreen

Spongy trail in an old growth forest. Photo by PlanGreen

We’ll return to all that in a moment, but I first want you to remember walking on a trail in the woods where your feet just seemed to bounce on the earth beneath them.  That’s because that soil was kept porous and, yes, spongy, by the mycelium forming a thick mat that was turning wood to soil under your feet.  Those mycelium have fruiting bodies that we call mushrooms–which may or may not be visible during your walk.

Mycelium on log

The white stuff in this photo is mycelium. It will spread throughout the log and ultimately decompose it–creating spongy soil. Photo by PlanGreen.

That mycelium looks a bit like a very dense spider web criss-crossing to create quite a network.   It gets its nutrition by decomposing the cellulose in the log.  The ability of mycelium of mushrooms in the category of “white rot fungi”  to decompose cellulose is related to their ability to decompose numerous other substances as well: bacterial toxins such as e-coli and fecal coliform as well as polycyclic aromatic hydrocarbons(PAHs).  Research also shows their ability to transform  bunker fuel oil, explosives, polychlorinated biphenyls (PCBs), and organochlorine pesticides–substances we hope we won’t find in OTCT parking lots.

Ecotrust Parking Lot

Built in 2001, the parking lot at Ecotrust is an outstanding model of a “Spongy Parking Lot”. It probably even has a few mushrooms by now. Photo by PlanGreen

We do have models for Spongy Parking Lots nearby.  My favorite is at the Jean Vollum Natural Capital Center (aka Ecotrust) in the adjacent Pearl District neighborhood.  Often on a summer day, the cars are kicked out of this pleasant parking lot for an array of fairs, festivals and farmers’ markets.  If you enlarge this photo, you will see that the lot is paved with light colored porous pavers and that those trees are planted in bioswales that also hold an array of mostly native plants.  You will see that  the parking spaces drain into those bioswales. which are about 2.5 feet deep.  Not only do the soils and plants in  the bioswales infiltrate the water from the parking lot within 24 hours, they also cool the water and filter the pollutants that come from our vehicles and pets.

BES Sediment Testing Chart

HCID-TPH is a screen to determine the presence and type of petroleum products that may exist in water or soil. Table from BES 2010 Stormwater Monitoring Report referenced below.

What could be better?  Well, Portland monitors the effectiveness of its bioswales and some of the latest soil sampling data¹ shows that E-coli and heavy oil results were variable, but levels were higher than the background soil sample sites located nearby but outside of the stormwater facilities. Metal and PAH levels found in stormwater facilities were generally similar to those found in background sample soils.  While these results show that soils in bioswales are likely taking up E-coli and heavy oil from runoff that would otherwise go down a storm drain, soil results could be CLEANER THAN THE BACKGROUND SAMPLES in all categories tested: E-coli, heavy oil, metals and PAHs.  If mycelium running through the bioswale made the soil spongier and more absorbent and if those same mycelium could help the plants thrive by “eating” more of the pollutants, then I maintain we would have an even spongier parking lot.  A spongier parking lot could better utilize and clean the water running off it into bioswales.  As its trees and plants grow better with less pollutants in its soil, the spongier parking lot will decrease the urban heat island effect even more and become an important strategy for both mitigating and adapting to climate change.

I hope you will read my previous three short blogs on mycoremediation/mycofiltration (http://plangreen.net/blog) to better understand the technology I am proposing.  I plan one more mycoremediation blog on monitoring.

_____________________________

¹Bureau of Environmental Services • City of Portland 2010 Stormwater Management Facility Monitoring Report

 

PDX Climate Action Plan 2015 Needs Urban Design

June 24, 2015  Testimony of Mary Vogel, PlanGreen to Portland City Council

There is a great deal to like in the Portland/MultCo Climate Action Plan 2015 and I applaud it as far as it goes. But one of the things missing is attention to URBAN DESIGN not just Urban Form. It needs to include implementation actions on evaluating existing land use policies that shape urban design for impact on climate change. That mandate could be included on p. 80, Urban Form and Transportation Chapter under either Decision-Making or Planning Scenarios Evaluation.

Here’s one example!  We need to change a policy that:

NW Townhouses w/short driveways and garages that dominate the sidewalk. The trees are on the wrong side of the sidewalk and will not last long in their present location.

NW Townhouses w/short driveways and garages that dominate the sidewalk. The trees are on the wrong side of the sidewalk and offer no protection or additional shade to the pedestrian. They will not last long in their present location. Cars parked in these driveways will block pedestrian passage altogether. Photo by PlanGreen

 

Promotes private automobile use

 

Leads to less community interaction

 

Makes our sidewalks less safe and useable for pedestrians

 

 

NW Townhouse w/van blocking sidewalk

This NW Portland sidewalk is partially blocked by this van. Note the driveway apron that usurps 1.5 public parking spaces on the street.

Displaces on-street parking spaces that make pedestrians feel safer

Usurps public parking space

Makes sidewalks less useable by pedestrians

 

 

 

 

SW Hamilton Townhouses - No street trees

This SW neighborhood street is adjacent downtown. It has the requisite off-street parking, but no street trees or landscaping to protect residents from the freeway above–or give them incentive to walk anywhere.

Disrupts the look and feel of the neighborhood

Displaces street trees that both protect and add comfort for the pedestrian

Displaces garden space that could be used to grow food

 

 

 

 

That is the requirement for off-street parking for every new house more than 500’ from a transit stop. Please make sure that a review of this policy and other existing policies is part of the Climate Action Plan.  That will greatly strengthen the plan!

I’m adding  a couple of examples that were not in my original testimony in order to show both the worst and best of Portland’s central city urban design with regard to parking.

NW 24th Ave Garages - Abominable Streetscape

I know you’re thinking this is the BACK of the property but its the FRONT on a street in one of the densest neighborhoods in Portland, OR–NW 24th Ave. Similar streetscapes are not uncommon in NW Portland.

                                                                                                    Even Portland’s numerous graffiti artists don’t seem to find these garage doors compelling places for their art–even though the doors front a street in one of the densest and most popular neighborhoods in Portland.

Most pedestrians don’t find this wasteland a compelling place to be either.  In fact, they cross the street in order to avoid them.  How does such awful urban design continue to exist in one of the most popular neighborhoods in Portland?

 

NW Pettygrove Condo Garage with single curb-cut

This NW Pettygrove condo building w/garage has a single curb-cut and is an example of how off-street residential parking should be handled–if it is necessary at all.

Okay, we can keep some off-street parking.  In really popular neighborhoods that folks from the suburbs flock to on evenings and weekends, residents with cars can really benefit from off-street parking.  This 12 unit condo building with it’s single driveway and garage exists immediately adjacent another abomination like the one above at NW 23rd & Pettygrove in Portland.  This building is an example of how off-street parking should be done–if it is done at all.

 

Let me know your thoughts!  I will pass them on to Portland policymakers and planners.