1. (a) The dam owner shall update all inundation map(s) at least every 10 years from the map preparation date of the dam, and sooner under conditions that include, but are not limited to, the following:

   1. (1) Anytime there is a significant change to the dam or critical appurtenant structure, or
   2. (2) Anytime there is a significant change to downstream development or terrain.

2. (b) When an inundation map is being updated for its 10-year cycle, a new model simulation may not be required.

   1. (1) If all the following conditions are met, a new model simulation is not required:

      1. (A) No significant change to the dam or critical appurtenant structures,
      2. (B) No significant change to downstream development or terrain,
      3. (C) No significant changes to model assumptions, and
      4. (D) No significant changes to inundation modeling state-of-practice.

   2. (2) If a new model simulation is not performed for a 10-year map update, the dam owner shall submit the following:

      1. (A) Updated map(s) with updated aerial imagery, critical facilities, map preparation date, the California-licensed professional civil engineer's seal, along with all map requirements in section 335.10.
      2. (B) A written explanation of why a new model simulation is not required, as described in section 335.16(b)(1), and all changes made to update the inundation map(s).
3. (c) A new model simulation must be performed if there is a significant change to the dam, critical appurtenant structures, downstream development or terrain, model assumptions, or inundation modeling state-of-practice. In this case, the dam owner shall submit the map(s), geospatial files, and technical memorandum per section 335.14. The technical memorandum must include a description of all changes to the model and map(s).

Note: Authority cited: Sections 6078 and 6162, Water Code. Reference: Sections 6006, 6007 and 6161, Water Code; and Section 6700, Business and Professions Code.

History

1. New section filed 10-19-2017 as a deemed emergency pursuant to Water Code section 6162; operative 10-19-2017 (Register 2017, No. 42). A Certificate of Compliance must be transmitted to OAL by 4-17-2018 or emergency language will be repealed by operation of law on the following day.

2. New section refiled 4-16-2018 as a deemed emergency pursuant to Water Code section 6162; operative 4-18-2018 (Register 2018, No. 16). A Certificate of Compliance must be transmitted to OAL by 7-17-2018 or emergency language will be repealed by operation of law on the following day.

3. New section, including amendments, refiled 7-12-2018 as an emergency pursuant to Water Code section 6162; operative 7-18-2018 (Register 2018, No. 28). A Certificate of Compliance must be transmitted to OAL by 10-16-2018 or emergency language will be repealed by operation of law on the following day.

4. Certificate of Compliance as to 7-12-2018 order, including renumbering of former section 335.16 to section 335.14, renumbering of former section 335.6 to 335.16 and amendment of section heading, section and Note, transmitted to OAL 10-16-2018 and filed 11-29-2018; amendments effective 11-29-2018 pursuant to Government Code section 11343.4(b)(3) (Register 2018, No. 48).