A. The Floodplain Administrator shall require Floodplain Use Permits for proposed construction and other development within all flood-related erosion-prone areas, as determined by lateral migration analysis described in the Town’s drainage criteria manual or in other predetermined, documented evidence. Areas generally most susceptible to lateral erosion and scour include, but are not limited to, locations of historical stream/wash meandering, locations where poorly defined or poorly consolidated banks occur, wash reaches characterized by changes in the direction, velocity, or amount of streamflow, and locations in the proximity of stabilizing features or structures such as rock outcrops or bridges. Alternative safe limits for erosion setbacks may be considered if approved in writing by the Floodplain Administrator based on an acceptable engineering study prepared and sealed by an Arizona registered professional engineer. However, at no time shall a setback be less than twenty-five (25) feet from an unprotected bank, and not less than fifteen (15) feet for a protected bank.

B. Permit applications shall be reviewed to determine whether the proposed site alterations and improvements will be reasonably safe from flood-related erosion, and will not cause flood-related erosion hazards or otherwise aggravate the existing hazard.

C. If a proposed development or structure including associated permanent features such as a patio wall or swimming pool or any other feature is found to be in the path of flood-related erosion, or would increase the erosion hazard, such improvements shall be relocated or adequate protective measures shall be taken to avoid aggravating the existing erosion hazard.

D. Areas within the erosion setback may be used for suitable open space purposes, such as for outdoor recreation and wildlife habitat areas, and for other activities using temporary and portable structures only. ((O)21-06, 11/17/2021; (O)17-04, 04/05/2017; (O)05-35, 10/05/2005)