It's raining again. Rainwater collects in the hollows of red geranium petals, puddles in the low spots of paved streets and plowed fields. In the country, a stream swollen with runoff flows deeper than it did a day before, foaming where it had barely rippled, its water tinged with brown from a tea of old alder leaves but still clear enough to reveal every rock in its bed. In town, water runs over scraps of paper stuck fast to the pavement, laps the edges of an old plastic lid, while raindrops pock the surfaces of dark puddles. Nearby, a comet of iridescence, a great, prismatic, glistening blob with curving tail, adorns the cracked concrete of a gas station. An hour later the comet is gone, its iridescence moving inexorably toward Puget Sound.
Not surprisingly, surface runoff turns out to be the main source of toxic chemicals in the Sound. ("Runoff called top pollutant in the Sound," screamed the Seattle Post-Intelligencer's lead headline on Saturday, Dec. 1.)
This isn't exactly startling news. In fact, it isn't news at all. Stormwater is the main source of water pollution in Puget Sound, writes John Lombard in his 2006 book, Saving Puget Sound. Stormwater "also affects water quantity, dramatically increasing peak flows and the 'flashiness' of streams ... and decreasing base flows during dry periods." By screwing up the natural flow pattern, it alters the populations and species of plants and critters living in the streams. By flowing off the land in fierce torrents, it gouges out stream beds. And it's expensive. Flooding and landslides like the ones we've seen throughout the Northwest this week cost millions every year. Then there's the cost of trying to control and decontaminate stormwater. "The region probably spends more than $1 billion each year to meet stormwater requirements," Lombard writes.
A 2006 report on "Damages and Costs of Stormwater Runoff in the Puget Sound Region" [160K PDF], prepared by geologist Derek Booth and two University of Washington colleagues, found that "[a]nnual stormwater program budgets ... range from hundreds of thousands to millions of dollars, with typical annual costs of approximately $100/person within a stormwater utility district." Booth and his colleagues reported that the city of Bellingham "has estimated $300,000-$500,000/year in additional funds would be required to keep up with current technologies and population growth beyond the $4.8 million currently budgeted. On a larger scale, Snohomish County identified 220 recommended projects with a total project cost of $85 million (representing a per capita expense of about $130)."
But we're not doing enough. In a generally upbeat conversation about restoring Puget Sound, Gov. Chris Gregoire conceded last spring that "where we're not making good progress is in areas like stormwater." UW professor of earth and space sciences David R. Montgomery wrote in the Seattle Post Intelligencer last March that he was "thrilled to see the rollout of Gov. Chris Gregoire's new 'science-based' Partnership for Puget Sound – until I read beyond the executive summary." Reading further, Montgomery found that "buried on page 43 of Appendix A, was a startling admission by the partnership's own scientific working group: 'The strategies listed are not likely to be sufficient to achieve ecosystem goals.' ... [T]here it is in black and white," Montgomery wrote. "The plan won't work." He went on to criticize "[r]eliance on standards in a storm water runoff manual which itself states 'land development as practiced today is incompatible with the achievement of sustainable ecosystems.'" Last year, he was one of 14 scientists who signed a letter to the partnership arguing that the existing plan wasn't likely to get the job done. He subsequently explained that if clean water laws were actually enforced, the current system would probably deal well enough with pollution – but pollution doesn't pose the main threat to salmon or to the natural systems on which salmon rely. Our fixation on pollution helps mask the real problem: a hydrologic pattern in which rainfall runs off across the paved surface of the land, instead of soaking into soil, then making its way slowly to rivers and streams. In an undisturbed catchment, Derek Booth explains, stormwater can stay in the soil for weeks, or even months. Most of the expensive retention ponds required for new development are designed to hold water for only a day or two. "One is led really inexorably toward ways of storing water in the soil," Booth maintains. Step one may be to "make sure there's still enough of that soil column to store the water. We only make it harder when our development style is to strip the land," he says.
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