18.08.182 Streams – Designation and rating of streams.
A. Streams are waterbodies with a defined bed and banks and demonstrable flow of water as defined in this chapter. Streams are designated as environmentally critical areas.
B. Stream Classification. Streams shall be designated Type 1, Type 2, Type 3, and Type 4 according to the criteria in this subsection.
1. Type 1 streams are those streams identified as “shorelines of the state” under Chapter 90.58 RCW.
2. Type 2 streams are those streams which are:
a. Natural streams that have perennial (year-round) flow and are used by salmonid fish; or
b. Natural streams that have intermittent flow and are used by salmonid fish.
3. Type 3 streams are those streams which are:
a. Natural streams that have perennial flow and are used by fish other than salmonids; or
b. Natural streams that have intermittent flow and are used by fish other than salmonids.
4. Type 4 streams are those natural streams with perennial or intermittent flow that are not used by fish.
C. Ditches. Ditches are artificial drainage features created in uplands through purposeful human action, such as irrigation and drainage ditches, grass-lined swales, and canals. Purposeful creation must be demonstrated through documentation, photographs, statements and/or other evidence. Ditches are excluded from regulation as streams under this section. Artificial drainage features with documented fish usage are regulated as streams. Drainage setbacks are required as per the city’s surface water manual. (Ord. 1036 § 26, 2006).