ARTICLE VIII. FLOOD HAZARD BOUNDARIES

SECTION 8.1. MINIMUM AREA FOR FLOODPLAIN DELINEATION.

All zones designated A, AH, AO, AE or A1 through A30 on the current Flood Insurance Study, the Flood Insurance Rate Maps and Flood Boundary and Floodway Maps for Pinal County, Arizona, shall constitute the minimum area for management under this Regulation.

SECTION 8.2. OTHER DELINEATIONS.

In areas without delineated flood hazard zones A, AH, AO, AE or A1 through A30, where development is imminent or ongoing, the District may require developers of land to delineate floodplains to be administered under this Regulation. For subdivision and master plan development, the developer shall delineate the 100-year floodplains and erosion setbacks per Arizona State Standards. Such delineations shall be consistent with criteria established by the Director, State Department of Water Resources and may be forwarded to the Federal Emergency Management Agency for adoption. Per 44 CFR Ch.1 et seq., if the State of Arizona has not adopted floodplain regulations, any development on State land shall comply with local regulations. The District may forward to the Federal Emergency Management Agency other delineations obtained from other sources, provided they are determined to be consistent with criteria established by the Director, of the Arizona Department of Water Resources.

Other sources include but are not limited to

(1)  a developer of floodplain property,

(2)  State or County agency,

(3)  any agency which must delineate a floodplain as a result of completion of a flood control structure, or (4) the Federal Emergency Management Agency.

1.  Such delineations shall be submitted to the Floodplain Administrator to be reviewed for technical adequacy. The Floodplain Administrator may forward such delineations to the Arizona Department of Water Resources and to the Federal Emergency Management Agency with a recommendation for approval or denial.

2.  All delineations approved by the Federal Emergency Management Agency are hereby adopted as referenced and shall be included on the Flood Management Maps for Pinal County.

SECTION 8.3 OTHER FLOOD HAZARD BOUNDARIES.

Whenever the District determines through a flood hazard study, watercourse master plan or other flood related study authorized by the Board that a flood related hazard exists due to such factors as high-velocity flows, erosion, sediment transport, deposition, unstable soil conditions or land subsidence, the Floodplain Administrator shall designate such hazard areas on the Flood Management Maps for Pinal County. The Floodplain Administrator shall establish technical criteria and enforce rules and regulations for subsequent development that meet or exceed criteria adopted by the Director, Arizona Department of Water Resources and when appropriate such studies may be forwarded to the Federal Emergency Management Agency.

SECTION 8.4 PUBLICATION OF FLOOD HAZARD BOUNDARIES.

All flood hazard designations as authorized by this Regulation including but not limited to erosion control zones, watercourse master plans, moveable bed watercourses and other special flood related designations and, including all A, AH, AO, AE and A1 through A30 zones on the Flood Insurance Rate Maps for Pinal County, Arizona, shall be shown on the official Flood Management Maps for Pinal County.

For floodplain management purposes, areas which are under current flood hazard study shall be designated by the Floodplain Administrator as preliminary delineations on the Flood Management Maps for Pinal County as the best technical data available pending final approval of the study by the Federal Emergency Management Agency.

SECTION 8.5. PUBLIC NOTICE.

Whenever a flood hazard identification study has been authorized by the Board, the District shall publish a notice concerning the intent and scope of the study and notify affected adjacent political jurisdictions. The District shall also mail information concerning the study or hold a public meeting for the affected property owners.

SECTION 8.6 DETERMINATION IN CASE OF DISPUTE.

If the boundary of any floodplain with an A Zone Delineation, Floodway, Floodway Fringe , Area of Shallow Flooding including Ponding Areas, Alluvial Fans or other flood hazard boundaries is in dispute the Floodplain Administrator shall determine the boundary using the best technical data available. In cases where a revision of the Floodway becomes necessary, the required public notice and public hearing process shall be followed and the necessary information shall be submitted to the Federal Emergency Management Agency.