This memorandum describes (1) the potential applicability to Pima County of a national initiative to institute reforms in floodplain management; and (2) an assessment of the effectiveness of Pima County's Riparian Habitat Mitigation Ordinance (attachment). An inter-departmental team was formed to formulate specific proposals for consideration as part of the Riparian Protection Element of the SDCP and the major plan amendment to the County's comprehensive plan.

This study is intended to assess flood risk, and identify flood hazards based on those risks, for the Beaver Dam area from the Beaver Dam Wash. The hydrologic and hydraulic results are intended for risk assessment and emergency management purposes only. The results of this study should not be considered as “best available technical information” for floodplain management purposes.”

Flooding and erosion within the Ranch Estates subdivision during the 2007 summer monsoon season raised the concerns of homeowners. This study addresses the impact of recent improvements in the drainage area upstream; provides updated flood-hazard mapping for the area, and identifies mitigation measures that could be implemented by the affected homeowners to address their flood/erosion hazards.