22.08.210 Stormwater management facilities.
Stormwater management (detention and treatment) facilities are necessary elements of development. If designed correctly and managed properly they can produce multiple benefits within the shoreline jurisdiction.
A. Policies.
1. Stormwater facilities should not be located in areas where there would be an adverse impact to existing shoreline ecological functions.
2. Stormwater management facilities should be designed to incorporate low impact development techniques whenever possible.
B. Regulations.
1. Stormwater management facilities shall be located outside of critical areas and their required buffers except as specified in BMC 22.08.010(B)(4), Shoreline buffers, and shall be subject to the requirements in BMC 22.08.120, Shoreline modifications/stabilization.
2. Stormwater management facilities shall be subject to the policies and regulations in BMC 22.08.110, Water quality, stormwater, and nonpoint pollution.
3. Stormwater management facilities shall provide a minimum of enhanced treatment as defined by the latest version of the Department of Ecology Stormwater Manual for Western Washington, and as further specified in Chapter 15.42 BMC, as amended, and per BMC 22.08.110, Water quality, stormwater, and nonpoint pollution.
4. When stormwater management facilities are proposed within shorelines and adjacent to required buffer areas, they shall be designed to provide additional riparian vegetative cover and increase or improve existing habitat corridors including habitat for anadromous fish.
5. New stormwater conveyance facilities (outfalls) shall not be constructed within required shoreline or critical area buffers unless no other feasible alternative exists.
6. Individual shoreline permits shall include a requirement that an applicant prepare a stormwater management facility maintenance program for a five-year period that includes the following elements:
a. Frequency and detail of maintenance of the facilities (this includes but is not limited to catch basin insert and vault cartridge replacement, removal of noxious vegetation, pipe and overflow clean-out and outfall and diffuser maintenance);
b. Copy of signed and implemented contract verifying the entity that will perform the maintenance action and the frequency of the maintenance; and
c. A maintenance report shall be submitted to the planning department each year for five years from the date of issue of the original shoreline permit. [Ord. 2013-02-005 § 2 (Exh. 1)].