Surface Water Management (Title 13) | Environment & Sustainability
6. Best management practices or “BMP’s”. Any schedule of activities, prohibitions of practices, maintenance procedure or structural and/or managerial practice approved by King County that, when used singly or in combination, prevents or reduces the release of pollutants and other adverse impacts to surface water, stormwater and groundwater. 7. City. The City of Sammamish, Washington, or, as indicated by the context, may mean any official, officer, employee or agency representing the City in the discharge of his or her duties. 8. Closed depression. An area greater than 5,000 square feet at overflow elevation that is low-lying and that has no or such a limited surface water outlet that the area acts as a stormwater retention facility
wetlands. The constructed elements of the conveyance system include gutters, ditches, pipes, catch basins, channels and most flow control and water quality treatment facilities. 12. Critical drainage area. An area that drains to Pine Lake or Beaver Lake, and all landslide hazard drainage areas as mapped or as determined by the City. Site specific evaluation shall be made to assess all areas. Critical drainage areas require more restrictive regulation than citywide standards afford in order to mitigate water quality,
flooding, severe erosion, or landslide problems that result from the cumulative impacts of development and urbanization. Department. The department of public works or its successor.
13.
Clean Water Act. 33 U.S.C. 1251 et seq., as amended.
9.
14. Development. Any activity that requires a permit or approval, including, but not limited to, a building permit, clearing and grading permit, shoreline substantial development permit, conditional use permit, special use permit, zoning variance or reclassification, subdivision, short subdivision, urban planned development, binding site plan, site development permit or right-of-way use permit. “Development” does not include a Class I, II, III or IV-S forest practice conducted in accordance with Chapter 76.09 RCW and WAC Title 222 or a Class IV-G nonconversion forest practice, as defined in SDC 21.04.040, conducted in accordance with Chapter 76.09 RCW and WAC Title 222 and a county-approved forest management plan.
10. Construct or modify. To install a new drainage pipe or ditch or make improvements to an existing drainage pipe or ditch, for purposes other than maintenance, that either serves to concentrate previously unconcentrated surface and stormwater runoff or serves to increase, decrease or redirect the conveyance of surface and stormwater runoff. “Construct or modify” does not include installation or maintenance of a driveway culvert installed as part of a single-family residential building permit. 11. Conveyance system. The drainage facilities and features, both natural and constructed, that provide for the collection and transport of surface water or stormwater runoff. The natural elements of the conveyance system include swales and small drainage courses, streams, rivers, lakes and
Effective | January 1, 2022 Revisions | June 29, 2022
Title 21: Sammamish Development Code | 133
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