Environment & Sustainability | Environmentally Critical Areas
discharges in or upstream of the no-disturbance or landslide hazard areas.
Insurance Study for King County,” as amended, as stated in SMC 15.10.060. The flood insurance study is on file at Sammamish City Hall. The best available information for flood hazard area identification as outlined in SMC 15.10.1302. shall be the basis for regulation until a new flood insurance rate map (FIRM) is issued that incorporates the data utilized under SMC 15.10.1302.
ii. For the portions of proposed subdivisions, short subdivisions and binding site plans that cannot infiltrate runoff up to the 100-year peak flow, at least 25 percent of the portion of the site that cannot infiltrate shall remain undisturbed and set aside in an open space tract consistent with SDC 21.03.020Q. through SDC 21.03.020T. The open space tract shall be located adjacent to any required critical area tracts and shall be designed to maximize the amount of separation between the critical area and the proposed development. If no critical areas tracts are required, the open space tract shall be located to provide additional protection to the no-disturbance area. iii. For the portions of all subdivisions and short subdivisions that cannot infiltrate runoff up to the 100-year peak flow, no more than 35 percent of the gross site area shall be covered by impervious surfaces. For new subdivisions and short subdivisions, maximum lot coverage should be specified for subsequent residential building permits on individual lots.
b. Development in frequently flooded areas shall be subject to the provisions in Chapter 15.10 SMC.
4. Flood hazard areas – Certification by engineer or surveyor
Repealed by Ord. O2005-193.
5. Channel relocation and stream meander areas
Repealed by Ord. O2005-193.
6. Landslide hazard areas – Development standards and permitted alterations A development proposal containing, or within 50 feet of, a landslide hazard area shall meet the following requirements: a. A minimum buffer of 50 feet shall be established from the top and toe of the landslide hazard area. The buffer shall be extended as required to mitigate a landslide or erosion hazard or as otherwise necessary to protect the public health, safety, and welfare. i. The buffer may be reduced to a minimum of 15 feet if, based on a critical areas study, the City determines
3. Frequently flooded areas
a. Frequently flooded areas include all areas of special flood hazards within the jurisdiction of the City of Sammamish. The areas of special flood hazard are identified by the Federal Insurance Administration in a scientific and engineering report entitled “the Flood
that the reduction will adequately protect the proposed development and other properties, the critical area and other critical areas off site.
84 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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