Frequently flooded areas shall be those floodways and associated floodplains designated by the Federal Emergency Management Agency (FEMA) flood hazard classifications as delineated on the most current available Flood Insurance Rate Maps for the city, or as subsequently revised by FEMA, as being within the 100-year floodplain, or those floodways and associated floodplains delineated by a comprehensive flood hazard management plan adopted by the city, as being within the 100-year floodplain or having experienced historic flooding; or channel migration zones (CMZ) identified through mapping provided in the city's SMP inventory, analysis and characterization report. The CMZ is considered to be that area of a stream channel which may erode as a result of normal and naturally occurring processes and has been mapped consistent with WAC 173-26-221(3)(b).
(Ord. 25-14 § 1.01; Ord. 12-18 § 1 (Exh. A))
A. 
The approximate location and extent of flood hazard areas within the city of Richland's planning area are shown on the sensitive areas maps adopted as part of this SMP, including, but not limited to, the most current available FEMA Flood Insurance Rate Maps (FIRM) and channel migration zone (CMZ) mapping provided in the city's SMP inventory, analysis and characterization report. These maps should be used as a general guide only for the assistance of property owners and the city of Richland to identify and designate flood hazard areas.
B. 
Applicants for shoreline development or modification may submit a site-specific CMZ study if they demonstrate these conditions do not exist on the subject property and the map is not accurate. The CMZ study must be prepared consistent with WAC 173-26-221(3)(b), and may include, but is not limited to, historic aerial photographs, topographic mapping, flooding records, and field verification. The CMZ must be prepared by a licensed geologist or engineer with at least five years of applied experience in assessing fluvial geomorphic processes and channel response.
(Ord. 25-14 § 1.01; Ord. 12-18 § 1 (Exh. A))
A. 
All development within frequently flooded areas shall comply with Chapter 23.12 RMC, Floodplain Use District, Chapter 22.16 RMC, Flood Damage Prevention, the city's shoreline master program, the International Building Code regarding structural safeguards to reduce risk to human life, health and property from flooding, and other pertinent ordinances and codes.
B. 
Any use or development shall not alter the normal movement of surface water in a manner that would cause the unnatural diversion of floodwater to otherwise flood-free areas.
C. 
CMZs shall be regulated as uses in Chapter 23.12 RMC, Floodplain Use District, and shall apply only to the Yakima River.
(Ord. 25-14 § 1.01; Ord. 12-18 § 1 (Exh. A); Ord. 59-19 § 5)