Eco Boulevard

Excerpt from Brand Avenue

Along a new main thoroughfare in the Madrid suburb of Vallecas, ingenious "air trees" made of recycled gasworks are growing.

Equal parts garden folly, architectural icon, town square, and adaptive reuse, the enclosures are the result of a competition won by Madrid design firm ecosistemaurbano:
Ecosistemaurbano were the winners, having come up with a dynamic and futuristic answer to the two goals specified by the competition regarding the main street of Vallecas: to generate social activity and adapt an open space from the bioclimatic point of view. The architects resorted to urgent action with the aim of creating a sort of linear wood at the centre of the boulevard – a green belt of compact vegetation to be grown in the next 15 to 20 years. In the middle of a young tree plantation along the boulevard, they placed three mock gasworks. These constructions will act as focal points for the social life of the new urban settlement, which to date has no public meeting places. At the base of the three so-called “air trees”, each with a diameter of about 20 metres, a slight hollow will accommodate the normal activities of an urban park.
One has been built thus far. Two more are soon to follow.

Inside, each air tree is distinct: the first air tree has "columns of air" on the outside and climbing vines on the inside; the second will gradually be encased in vines on both exterior and interior surfaces; a third will feature vegetation on the exterior and a projection wall on the interior--a 360-degree theater for public use.

The air trees are also energy independent, offering solar-powered cooling in addition to shade:
The first air tree is the result of 16 hemicycles arranged in a circle, covered with a thermal fabric and supported by a lightweight, easily assembled frame, which is identical for the three large “dynamos”. In terms of energy these theatrical scaffoldings are self-sufficient, relying on a system of photovoltaic solar collection. An evaporation and transpiration plant has been devised for the air conditioning of these open spaces, which are situated in a zone that suffers from very high temperatures in summer. Water pumped into tanks at the top of the cylinders will be redistributed in the lower layers, where it will be vaporised. This will lower temperatures by eight to ten degrees in the small circular spaces, thus making them very pleasant places in which to relax.

Volkshaus

Devised by a design group called Landship, (see also Be-haus, A-Kit, and Oji-Group) the Volkshaus concept was intended as a means to realize the simple practicality embodied by the Volkswagen Beetle in a DIY home building system. Bearing some characteristics of a plug-in architecture platform, it uses a system which combines 4x9.5" (105x240mm) wood beams and 4x4" posts connected with a concealed modular steel joint and modular floor, roof, and prefabricated insulated wall panels which nail into place on the post and beam frame. The system integrates both Japanese and western styles of design with modern materials and new eco-sensible systems for energy and climate control, such as a roof trombe wall style heat collector, a roof-peak passive ventilator system, and integrated photovoltaic panels. It has so far been used for about 2000 homes in Japan and is offered in a variety of kits from a community of companies specializing in making products for it. Unfortunately, the exchange rates and the fact that almost all building lumber in Japan is imported makes the cost of importing these kits to the US unattainable.

Sustainable Building Checklist

workinproperty.com 06 March 2007

A checklist has been prepared by Checklist South East to help all parties in the development process consider the true impact of any project.

The checklist is intended for the use of developers to ensure that they have tackled the critical issues in their proposal. Similarly it is adopted by planners when considering an application.
The Checklist takes into account industry standards such as BREEAM, Ecohomes, Urban Design Compendium, National Standards Framework.

The Checklist is divided into sub sections, as taken from their website:

• Climate Change and Energy To ensure that new developments are appropriately adapted to the impacts of present and future climate change and to minimise their own impact on greenhouse gases, flooding, heat gain, water resources and water quality.
• Community
  To ensure that the development supports a vibrant, diverse and inclusive community which integrates with surrounding communities.
• Place Making To ensure that the most sustainable sites are used for development and that the design process, layout structure and form provide a development that is appropriate to the local context and supports a sustainable community.
• Transport and Movement To ensure people can reach facilities they need by appropriate transport modes, encouraging walking and public transport use and reducing the use of private cars for shorter journeys.
• Ecology To ensure that the ecological value of the site is conserved and enhanced maintaining biodiversity and protecting existing natural habitats which can contribute to and enhance the amenity of the area.
• Resources To promote the sustainable use of resources, including the reduction and re-use of wastes, related to both the construction and operation of new developments.
• Business To ensure that the development contributes to the sustainable economic vitality of the local area and region.
• Buildings To ensure that the design of individual buildings does not undermine the sustainability of the overall development.
  Checklist South East allows the various parties to answer the numerous questions on-line, providing policy guidance as well as the relative importance of each question.

An important tool in an ever changing (planning) climate..

New Urbanism & ‘low-impact’ infrastructure

by Philip Langdon
Courtesy New Urban News

Natural drainage systems and other ecologically advanced technologies are coming to walkable communities.

A new urbanist-led charrette in November 2006 recommended that New Orleans be redeveloped with “natural drainage systems” — techniques allowing stormwater to soak into the ground rather than be piped, sometimes full of pollutants, to bodies of water like Lake Pontchartrain.The recommendation, intended for the Gentilly section of the flood-ravaged city, is a sign of new urbanists’ emerging interest in engineering and landscape systems based on processes found in nature.

In recent years, environmental activists have argued that rain should be handled in a more natural fashion — through “rain gardens,” bioswales, and other ecological features — instead of relying heavily on underground pipes and other conventional engineering mechanisms. A growing number of new urbanists are moving toward this ecological approach.Inquiries by New Urban News found nature-based environmental techniques being incorporated into projects and plans ranging from Traditional Neighborhood Developments (TNDs) in North Carolina and Pennsylvania to urban neighborhoods and HOPE VI public housing redevelopments in Portland, Oregon, and Seattle. (An article on using stormwater management to enhance civic spaces is on page 5 of the December 2006 issue.)

The approach is known by many names, including high-performance infrastructure, natural drainage systems, bioretention, low-impact development, and sustainable stormwater management. “’Laying lightly on the land’ is perhaps the best term we have,” says Tom Low, the Charlotte, North Carolina-based director of town planning for Duany Plater-Zyberk & Company (DPZ). “It basically means using less pipe. The water sheets across the surface. The amount of surface pavement per dwelling unit is reduced.”

Low led a group that last month completed a study of a TND called Griffin Park, to be built in Greenville County, South Carolina. The study looks at building Griffin Park as a TND with conventional engineering versus building it as a TND with a more nature-based system. The natural approach envisions less pavement, fewer curbs and gutters, less storm sewer pipe, and fewer storm sewer inlets, thereby reducing some of the development’s costs. The study is expected to be used to promote natural drainage options among new urbanists.

THE NATURAL APPROACH

For Woodsong, a 22-acre TND in Shallotte, North Carolina, developer Buddy Milliken insisted on natural methods of handling rainwater. In front of a series of cottages on narrow lots is a concrete street 300 feet long and 10 feet (one lane) wide. The center of the street consists of a three-foot-wide strip of pervious concrete. Rain seeps through the porous pavement and a rock subbase and enters the ground, rather than being concentrated in storm drains and pipes. The narrow, curbless street, passing within about seven feet of the houses, helps replenish an aquifer. At the same time, it helps create a more relaxed and intimate setting, making the properties more valuable.

A ditch that cut across the mostly wooded property prior to development has been modified by installing “small check dams or gabions to slow the water down,” Milliken says. Advocates of natural drainage often sum up the basic principles in these words: “Slow the water down, spread it around, and get it into the ground.” Rain from roofs may be captured in cisterns or directed into rain gardens — mild depressions filled with natural material that absorbs the water and gives it time to percolate into the soil. “These are very, very simple things,” says Milliken.

Low devised Woodsong’s neighborhood plan, which includes a man-made wetland in one area and a pond in another. Milliken says that in a conventional development the pond might have been dug in an out-of-the-way spot and then ringed by a chain-link fence. The detention and retention ponds that have proliferated in recent decades are often unsightly and hard to maintain — a waste of valuable real estate. Milliken chose instead to place the pond in a prominent location, in front of a group of houses, forming a neighborhood centerpiece which helps to control rainwater and let it soak into the ground.

At the edges of the pond are four small constructed wetland bays that slow and filter the water before it enters the pond. Mary Vogel, principal in PlanGreen in Washington DC advises against ponds because, among other things, their water may heat up, harming fish life. However, Peg Staeheli, principal in SvR Design Company in Seattle, says a detention pond is needed in some situations to control the water flow. Woodsong’s pond is apparently an aesthetic plus, which has translated into stronger real estate values.“Everything we’ve done has been with the intent to get a financial return —not necessarily the next day,” Milliken says of Woodsong, which he has been building since 1999. “New Urbanism and the environment are mutually reinforcing.”The Oct. 29-Nov. 3 Gentilly charrette, led by Andres Duany and covering 17 New Orleans neighborhoods, recommended using natural drainage systems to absorb water, decrease flooding, and lessen pollution in the runoff, much of which goes into Lake Pontchartrain untreated. Vogel says one instrument is “roadside bioswales — concave gardens planted with native perennial plants and trees — [which] increase absorption and add beauty and resiliency to the environment.” These can be placed between streets and sidewalks.

New Orleans contains many road medians (New Orleanians call them “neutral ground”) that were damaged by last year’s flooding. The intention is to dig into some of these medians and install a mix of soil conditioners, organic mulches, and rock, capable of holding and gradually dispersing a large quantity of water. The economics are favorable, says Vogel. “Whereas conventional street and storm drain maintenance costs increase over time as the result of aging materials, pipes, and drains, natural drainage systems actually become more effective over time, as plants and trees mature.”

One city that is a leader in combining natural drainage with walkable streets and neighborhoods is Seattle, where sustainable stormwater management has been advocated by the Puget Sound Action Team and has been put into practice by firms such as SvR Design. SvR designed High Point, a mixed-income, 34-block, 1,600-unit Hope VI project that features vegetated and grassy swales, porous concrete sidewalks, and front-yard rain gardens. South Lake Union, a large mixed-use development to be built north of downtown Seattle, may also employ natural drainage. (For techniques at High Point, see www.thehighpoint.com or www.svrdesign.com.)