Surface Water Management (Title 13) | Environment & Sustainability
a. Has an urban plan development land use designation in the Sammamish comprehensive plan land use map; b. Would, at full buildout of the project site, result in 50 acres or more of new impervious surface within a drainage subbasin or a number of subbasins hydraulically connected across subbasin boundaries; or c. Has a project site of 50 acres or more within a critical aquifer recharge area, as defined in this Title. 42. Licensed civil engineer. A person registered with the state of Washington as a professional engineer in civil engineering. 43. Maintenance. Those usual activities taken to prevent a decline, lapse or cessation in the use of currently serviceable structures, facilities, equipment or systems, if there is no expansion of the structure, facilities, equipment or system and there are no significant hydrologic impacts. “Maintenance” includes the repair or replacement of nonfunctional facilities or the replacement of existing structures with different types of structures, if the repair or replacement is required by one or more environmental permits or to meet current engineering standards and the functioning characteristics of the original facility or structure are not changed.
46. Municipal separate storm sewer systems or “MS4”. A conveyance or system of conveyances that is owned by the City of Sammamish that discharges to waters of the U.S., designed or used to collect or convey stormwater (e.g., storm drains, pipes, ditches), not a combined sewer, and not part of a sewage treatment plant, or publicly owned treatment works. 47. National Pollutant Discharge Elimination System or “NPDES”. The national program for controlling pollutants from point source discharges directly into waters of the United States under the Clean Water Act. 48. National Pollutant Discharge Elimination System permit. An authorization, license or equivalent control document issued by the Environmental Protection Agency or the Washington State Department of Ecology to implement the requirements of the NPDES program. 49. Native vegetated surface. A surface in which the soil conditions, ground cover and species of vegetation are like those of the original native condition for the site, as more specifically set forth in the Surface Water Design Manual. 50. Natural discharge location. The location where runoff leaves the project site under existing site conditions as defined in the Surface Water Design Manual. 51. Natural surface water drainage system. Such landscape features as rivers, streams, lakes and wetlands. This system circulates water in a complex hydrological cycle. 52. New impervious surface. The creation of a hard or compacted surface such as roofs, pavement, gravel or dirt or the addition of a more compacted surface such as the
44. Manager. The City manager or designee.
45. Master drainage plan. A comprehensive drainage control plan for projects subject to large project drainage review and intended to prevent significant adverse impacts to surface water and groundwater, both on and off sites.
Effective | January 1, 2022 Revisions | June 29, 2022
Title 21: Sammamish Development Code | 137
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