Project Details

Sun Valley Area Drainage Master Plan Update

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Project Contact: Theresa Pinto
Region: W
District: 4 - Clint L. Hickman
Phase: Planning & Studies
Description:

The initial Sun Valley ADMP was completed in December 2006.  The primary issues at that time were high development pressure and the large alluvial fan floodplains within the study area (e.g., about 41 square miles or 23% of the area is mapped within the 100-year floodplain).   The Sun Valley ADMP included recommended solutions that focused on constructing large detention basins and walled levee corridors along 65 miles of washes.  The initial project cost was estimated to be $610M.  Some of the benefits of the solutions were that the solutions would provide regional flood control systems that could be used to drain downstream tributaries, reduce flood risks by removing the alluvial fan uncertainties, and eliminate or significantly reduce the size of the floodplains. 

In the Sun Valley ADMP Update, the hydrology and hydraulics will be modeled using new topographic mapping, FLO-2D modeling, and the updated NOAA 14 rainfall.  The recommended alternatives will be refined based on the updated model results and include non-structural flood risk reduction measures.  The study will include significant coordination with the City of Buckeye, property owners and developers, the Arizona State Land Department, and other stakeholders. 

Most of the Sun Valley area is undeveloped but development pressure exists and refining the flood hazard mitigation alternatives and plan will be helpful for the City of Buckeye and property owners so that they can make better, more informed decisions about managing flood hazards and reducing flood risks.  Water conservation measures, including green infrastructure, and other environmental issues will be evaluated during the study.  In addition, some of the alluvial fans will be evaluated to determine if they are inactive; if they are inactive, then some of the floodplain maps could be updated to reflect the existing flood hazards.   

The hydrology and hydraulics modeling started in February 2019 and will be completed by January 2020.  Future work assignments will include stakeholder coordination and alternatives development. 

Status:

Started January 2019



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