Wetlands, Streams and Steep Slopes Code Update
A public open house is currently scheduled for October 9, 2018 at the Tukwila Community Center, 12424 42nd Avenue S, Tukwila 98168. The open house will run from 5-7 PM with a presentation at 5:30 PM.
Elements of the Update include:
- Comparison of existing code to Best Available Science and development of a gap analysis to identify consistencies.
- Development of a Departures Report, as required, identifying and explaining proposed deviations from Best Available Science.
- Outreach to affected property owners throughout the City to include mailings, newspaper articles, webpages, and an open house.
- Integration of tree retention, removal and replacement requirements for trees and vegetation in sensitive areas.
The Community Affairs and Parks Committee was briefed about the update process on June 26, 2018.
To get on the interested party list:
Contact Tukwila Planning Department, at Minnie.Dhaliwal@TukwilaWA.GOV, 206-431-3685.
WETLANDS AND STREAMS CODE UPDATE
Since then the Department of Ecology established new guidance on Best Available Science for wetlands and the Department of Fish and Wildlife established new guidance on Best Available Science for streams .
The City’s consultant, The Watershed Company, prepared a Gap Analysis Report which will be used to draft the new rules. This document provides a review of the City’s existing regulations, noting gaps where existing regulations may not be consistent with Best Available Science.
What is best available science?
Best available science or BAS is the most current science relative to the functions and values of the critical areas, including the role of buffers in protecting wetland and stream functions and fish and wildlife. Under the GMA (RCW 36.70a.175), best available science must be used to designate and protect critical areas and to take measures to preserve and enhance anadromous fisheries, such as salmon (fish born in fresh water and spends most of its life in the salt water and return to fresh water to spawn).
What are wetlands and what is their importance?
“Wetland” means those areas that are inundated or saturated by groundwater or surface water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include bogs, swamps, marshes, ponds, lakes and similar areas.
Wetlands do not include those artificial wetlands intentionally created from nonwetland sites, including but not limited to irrigation and drainage ditches, grass-lined swales, canals, detention facilities, wastewater treatment facilities, farm ponds, landscape amenities or those wetlands created after July 1, 1990 that were unintentionally created as a result of the construction of a road, street or highway. However, those artificial wetlands intentionally created from non-wetland areas to mitigate conversion of wetlands as permitted by the City shall be considered wetlands.
Wetlands and their associated buffers are important in that they help maintain water quality; store and convey storm and flood water; recharge ground water; provide fish and wildlife habitat; and serve as areas for recreation, education, scientific study and aesthetic appreciation.
What are streams and what is their importance?
“Watercourse” means a course or route formed by nature or modified by man, generally consisting of a channel with a bed and banks or sides substantially throughout its length along which surface water flows naturally, including the Green/Duwamish River. The channel or bed need not contain water year-round. Watercourses do not include irrigation ditches, stormwater runoff channels or devices, or other entirely artificial watercourses unless they are used by salmonids or to convey or pass through stream flows naturally occurring prior to construction of such devices.
Streams and their associated buffers are important in that they provide important fish and wildlife habitat and travel corridors; help maintain water quality; store and convey storm and flood water; recharge groundwater; and serve as areas for recreation, education, scientific study and aesthetic appreciation.
City of Tukwila contact: Minnie Dhaliwal at 206-431-3685 Minnie.Dhaliwal@TukwilaWA.gov