Surface Water Management (Title 13) | Environment & Sustainability
b. A proposed project required by this chapter to have drainage review shall meet each of the special requirements which apply to the site and which are described in detail in the Surface Water Design Manual. c. An adjustment to the core requirements or special requirements contained in the Surface Water Design Manual may be proposed pursuant to the terms and conditions for drainage adjustment in the Surface Water Design Manual, subject to the following limitations: i. Proposed projects subject to full or large project drainage review or any project subject to drainage review located within a critical drainage area shall not qualify for an Adjustment from Core Requirement No. 3: (Flow Control), except that: a) Proposed projects subject to full or large project drainage review, not located in a Critical Drainage Area, may be exempt from Core Requirement No. 3 if they meet the Surface Water Design Manual-defined exemption criteria where less than 5,000 square feet of new plus replaced impervious surface will be created and less than ¾ acres of new pervious surface will be added. b) Proposed projects subject to full or large project drainage review, located within Critical Drainage
ii. Proposed projects subject to Full or Large Project Drainage Review or any project subject to drainage review located within a critical drainage area that request a Standard or Experimental Design Adjustment from any Core or Special Requirement, shall declare their intent for an Adjustment with a land use application. Adjustments shall be processed as a Type 2 decision in accordance with SDC 21.09.010. Criteria for granting an adjustment are in the City’s adopted Surface Water Design Manual and City Addendum, Section 1.4.2. Drainage Adjustments not disclosed as part of the land use application shall be processed as a stand-alone Type 2 decision. d. Proposed subdivision and short plat projects shall include outreach and education materials to support the continued maintenance and operation of low impact development best management practices. Such materials shall include an on-site educational kiosk located in a high foot traffic area of the development, educational brochures and handouts, noticing on title, noticing on the final plat of maintenance and operations responsibility, and noticing in the covenants, conditions, and restrictions, when any are applicable. Educational kiosks shall only be required for subdivision plats.
4. Critical drainage areas
a. Development in areas where the department has determined that the existing water quality, flooding, severe erosion, or landslide conditions present an imminent likelihood of harm to the welfare and safety of the surrounding community shall meet special drainage
Areas, may request an exemption from Core Requirement # 3 in accordance with SDC 21.03.050.D.4.e.
Effective | January 1, 2022 Revisions | June 29, 2022
Title 21: Sammamish Development Code | 145
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