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Red Butte LOMR • JE Fuller

Red Butte LOMR

Problem

  • Existing approximate Zone A FIRM mapping was outdated and inaccurate.
  • Lack of detailed floodplain information made permitting in the area difficult.

Approach

  • JEF utilized FLO-2D to perform hydrologic modeling of upstream contributing watersheds and hydrologic and hydraulic modeling of flow in the study area.
  • JEF also utilized the FEMA three-stage approach to alluvial fan identification and mapping for the Cochise Stronghold Canyon Wash.

Solution

  • JEF prepared revised FIRM mapping with Zones A, AO2, AO1 and Shaded X zones for the Richland Ranchettes study area.
  • The revised FIRM mapping included AO mapping with velocities for the Cochise Stronghold Canyon alluvial fan.
  • The revised mapping was approved by FEMA on January 17, 2011

Location

Pima County,  Arizona

Client

Pima County Flood Control District

Project Leads

John Wallace