|Creative rain tank (Photo by Buster Simpson)|
by Cynthia Barnett, from Orion, UTNE Reader: http://www.utne.com/community/water-conservation-zm0z14jfzwil.aspx
Contrary to reputation, the urban pallor is not borne of rain, which falls almost imperceptibly from silvery clouds that match the nearby waters of Puget Sound.
Rather, the gloom rises from the cement hardscape.
The busy streets are paved dark gray, the wide sidewalks beside them light gray. The skyscrapers rise in shades of gray. The hulking freeways, ramps, and overpasses: gray. The monorail track and its elephantine pillars: gray.
Trudge the sidewalks northwest to Seattle’s Belltown neighborhood, hang a left on Vine Street toward the sound, and a 10-foot-tall, bright blue rain tank pops from the dullness, tipped whimsically toward a red brick office building.
Atop the tank, green pipes in the shape of fingers and a thumb reach out, the stretched index finger connected to a downspout from the rooftop. Rainwater flows from roof to finger to palm to thumb, from which it pours to a series of descending basins built between the sidewalk and the street. They, in turn, cascade to landscaped wedges growing thick with woodland plants.
For two blocks, as Vine slopes toward the sound, water trickles down a runnel and through street-side planters, shining stones, and stepped terraces, enlivening the roadway with greenery, public sculpture, and the sounds of falling water.
The project, called Growing Vine Street, began as a small, water conservation effort among residents and property owners to turn their stretch of a former industrial neighborhood into an urban watershed.
Twenty years later, it is a big part of the answer to the largest single source of pollution fouling Puget Sound and most of the major bays and freshwater ecosystems of the United States - stormwater.
The gray shellac of a city repels more than the imagination. When rain flows along streets, parking lots, and rooftops rather than percolating into the ground, it soaks up toxic metals, oil and grease, pesticides and herbicides, feces, and every other scourge that can make its way to a gutter.
This runoff impairs virtually every urban creek, stream, and river in Washington. It makes Pacific killer whales some of the most PCB-contaminated mammals on the planet. It’s driving two species of salmon extinct, and kills a high percentage of healthy coho within hours of swimming into Seattle’s creeks, before they’ve had a chance to spawn.
Returning some of nature’s hydrology to the cityscape can make an enormous difference - or could - as more individuals, businesses, and neighborhoods remake their bit of the terra firma.
Washington State University scientists have found that streets with rain gardens clean up 90 percent or more of the pollutants flowing through on their way to the sound. Green roofs reduce runoff between 50 and 85 percent and can drop a building’s energy costs by nearly a third.
Cisterns like the one on Vine Street solve two problems, reducing runoff and capturing water for outdoor irrigation - which in summer can account for half a city’s freshwater demand.
Read more: http://www.utne.com/community/water-conservation-zm0z14jfzwil.aspx#ixzz32pjeBFcp