Surface Water Management (Title 13) | Environment & Sustainability
31. Full drainage review. The evaluation required by SDC 21.03.050D. for any proposed project, unless the project is subject to simplified drainage review, targeted drainage review, direct drainage review or large project drainage review, that: a. Would result in 2,000 square feet or more of new plus replaced impervious surface; or
acceptable to the director. “Performance guarantee,” “maintenance guarantee” and “defect guarantee” are considered subcategories of financial guarantee.
27. Flood hazard reduction plan. A plan and all implementing programs, regulations and procedures including, but not limited to, capital projects, public education activities and enforcement programs for reduction of flood hazards and prepared in accordance with RCW 86.12.200. 28. Flow control best management practice. A small-scale drainage facility or feature that is part of a development site strategy to use processes such as infiltration, dispersion, storage, evaporation, transpiration, forest retention, and reduced impervious surface footprint to mimic predeveloped hydrology and minimize stormwater runoff. “Flow control best management practice” includes the methods and designs specified in the Surface Water Design Manual. 29. Flow control facility. A drainage facility designed to mitigate the impacts of increased surface and stormwater runoff generated by site development in accordance with the drainage requirements in this Section. A flow control facility is designed either to hold water for a considerable length of time and then release it by any combination of evaporation, plant transpiration or infiltration into the ground or to hold runoff for a short period of time and then release it to the conveyance system. 30. Forest practices. Any activity conducted on or directly pertaining to forest land and relating to growing, harvesting, or processing timber, as defined in Chapter 222-16 WAC.
b. Would result in 7,000 square feet or more of land disturbing activity.
32. Groundwater. All waters that exist beneath the land surface or beneath the bed of any surface water. 33. High-use site. A commercial, industrial or road intersection site that generates a higher than average number of vehicle turnovers or has other characteristics that generate the potential for chronic oil accumulation. “High-use site” includes:
a. A commercial or industrial site subject to:
i. An expected daily traffic count greater than 100 vehicles per 1,000 square feet of gross building area; ii. Petroleum storage or transfer in excess of 1,500 gallons per year, not including routine fuel oil storage or transfer; or iii. Use, storage or maintenance of a fleet of 25 or more diesel vehicles each weighing over 10 tons; or b. A road intersection with average daily traffic counts of 25,000 vehicles or more on the main roadway and 15,000 or more vehicles on any intersecting roadway,
Effective | January 1, 2022 Revisions | June 29, 2022
Title 21: Sammamish Development Code | 135
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