16.55.380 Critical area report – Additional requirements for frequently flooded areas.
In addition to the general critical area report requirements of BMC 16.55.210, critical area reports for frequently flooded areas must meet the requirements of this section. Critical area reports for two or more types of critical areas must meet the report requirements for each relevant type of critical area.
A. Prepared by a Qualified Professional. A critical areas report for a frequently flooded area shall be prepared by a qualified professional such as a hydrologist or fluvial geomorphologist.
B. Areas Addressed in Critical Area Report. The following areas shall be addressed in a critical area report for frequently flooded areas:
1. The project area of the proposed activity;
2. All shoreline areas, floodplains, other critical areas, and related buffers within 200 feet of the project area.
C. A critical area report for frequently flooded areas shall contain an assessment of the following site and proposal related information that describes the effects of proposed development on floodplain functions including but not limited to:
1. Storing and conveying floodwater;
2. Reducing peak flows and flow velocities;
3. Reducing redd scour and displacing rearing juvenile fish at the project site and downstream;
4. Maintaining sediment quality in streams;
5. Improving water quality;
6. Development within frequently flooded areas shall be allowed maintaining and improving fish access;
7. The reports shall also include mitigation for adverse effects on floodplain functions.
D. Planning director shall have the authority to require consultation with the Washington Department of Fish and Wildlife or other appropriate agencies. [Ord. 2008-04-037; Ord. 2005-11-092].