Section 335.8 - Technical Memorandum(a) A technical memorandum shall be prepared for each dam system to document the modeling used to develop inundation maps. The technical memorandum shall include the following: (1) Name and location of the dam and critical appurtenant structures.(2) Description of the dam, including the materials and methods of construction and a description of each critical appurtenant structure. Identify elevations of the crest, upstream, and downstream toes. Provide a description of the outlet(s), including capacity. Provide justification for appurtenances that are not considered critical appurtenant structures by the dam owner.(3) Reservoir storage capacity curve that shows the relationship between reservoir elevation and volume from the base of the reservoir to the dam crest. Elevation shall be specified as feet above NAVD88.(4) Brief summary of the following: (A) Modeled failure scenario(s) for the dam system, including the scenario described in section 335.6(a)(5), if applicable. For each failure scenario, include the breach hydrograph immediately downstream of the dam or critical appurtenant structure in tabular and graphical formats.(C) Modeling assumptions of the meteorological loading condition, type of reservoir routing, downstream roughness or other friction coefficients, and initial conditions of downstream watercourses.(D) Breach parameters for each failure scenario submitted in tabular format. Provide an explanation for breach parameter selection.(E) Type of terrain data used, including any modifications made to the terrain.(F) Any sensitivity analyses of the model, including the model's response to changes made to the roughness or other friction coefficients.(G) Modifications made to stabilize the model or accelerate its computational runtime, if applicable, and the effects such modifications have on the modeled inundation results.(H) Determination of the inundation boundary per section 335.10(c).(5) The signature, seal, and license number of the California-licensed professional civil engineer responsible for preparing the technical memorandum.Cal. Code Regs. Tit. 23, § 335.8
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 A Certificate of Compliance must be transmitted to OAL by 4-17-2018 or emergency language will be repealed by operation of law on the following day.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 repealer of former section 335.8, renumbering of section 335.12 to section 335.8 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). Note: Authority cited: Sections 6078 and 6162, Water Code. Reference: Sections 6160 and 6161, Water Code; and Section 6700, Business and Professions Code.
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 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 repealer of former section 335.8, renumbering of section 335.12 to section 335.8 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).