Jay Manning visits Bremerton to talk stormwater
Thursday, August 28th, 2008Jay Manning, director of the Washington Department of Ecology, was in Bremerton today to get the lowdown about low-impact stormwater management from folks at the Home Builders Association of Kitsap County.
Art Castle of the association is leading a local group of officials in the development of a “cook book” of low-impact practices designed to dovetail with state rules for managing stormwater.
Kitsap Sun photo
The parking lot at the office of the Home Builders Association happens to be built with pervious asphalt and various kind of pervious pavers. Manning watched as Castle poured water from a hose onto the pervious asphalt. No runoff or pooling was evident, as the water penetrated straight into the pavement.
Castle was glad to have some time to talk with Manning, a native of South Kitsap, because the Home Builders group has run into some regulatory obstacles with respect to the upcoming “cookbook.”
For example, engineers are debating how fast water can pass through pavement within a given design and whether that rate of penetration will hold up over time. Pervious pavement depends on creating “pores” during construction and keeping those pores open as time goes on. Sometimes the owner must use a pressure washer to reopen the pores.
In this example, the debate is about finding an acceptable rate of water penetration for a given design. If the assumed rate is too low, a developer will be required to build a backup stormwater system, such as a pond. That raises the cost of development and discourages the use of low-impact methods.
If the assumed rate of penetration is higher than what actually occurs in a heavy storm, then the water runs off the pavement with no place to go. That leads to flooding of streets and other problems.
Those are the kinds of issues that Castle wanted to address with Manning.
Manning told me that this meeting comes at an opportune time, because his agency must decide how to respond to a recent ruling by the Pollution Control Hearings Board that mandates the use of low-impact development wherever “feasible.” See Kitsap Sun story of Aug. 8.
Manning asked Castle to describe when low-impact development would not be feasible. Castle said he knows of three conditions that would preclude the use of LID: on sites with steep, unstable slopes; in places where you find especially dense clays that cannot pass water; and in areas with high groundwater levels that prevent water from soaking in.
Manning said he faces a decision about whether to appeal the hearing board’s decision to court or else live with it.
“If we live with this decision,” he said to me, “then what’s that going to mean for the Phase 1 permit (larger cities and counties) and the Phase 2 permit (smaller cities and counties)?”
Basically, state requirements would have to be rewritten.
The specific ruling (PDF 212 kb) by the Pollution Control Hearings Board was for Phase 1 jurisdictions, but it signals the board’s position for the Phase 2 hearing, scheduled for October, Manning said. If Ecology does not appeal the ruling to the courts, agency lawyers could try to settle some key issues before the October hearing, he said.


Scripps Interactive Newspapers Group
Recent Comments