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Spook Hill ADMP |
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Flood Control District of Maricopa County , Mesa
 The purpose of the Spook Hill Area Drainage Master Plan (ADMP) Update was to expand the existing Spook Hill Area Drainage Master Study (ADMS) conducted in July 1987 by quantifying the extent of flooding problems, to incorporate existing drainage structures into the model, and to develop alternative solutions to flooding problems for the 36 square miles of contributing watershed. The primary objectives of this study are to develop the most practicable solution to address the flooding issues within the watershed and to mitigate the potential increase in runoff due to development in order to preserve the ability of the Buckhorn–Mesa Project to provide protection to lands downstream from future 100-year flood damages. An additional objective is to determine what would be necessary to remove the jurisdictional status of the FRS (dam) structures and thereby relieve the District of the liability and ongoing maintenance associated with them. This study will also coordinate issues related to construction of the proposed Red Mountain Freeway and its impact on the existing and proposed condition.
- In the Level I Analysis (Alternative Development) Phase , the project team collected information in the project area on the cultural, environmental, visual character, and ecological resources. Multi-use opportunities and physical constraints were also identified during this process. Using this information, conceptual project flood control alternatives were generated and the alternatives were ranked in a matrix with the highest-ranking alternatives advancing to the Level II Analysis phase.
- In the Level II Analysis (Alternative Analysis) Phase , the project team evaluated and documented the pros and the cons of each flood control alternative selected in the Level I analysis. Detailed cost estimates were be prepared which included design, major construction items, rights-of-way, and major utility relocations. The project team sought input from the public and the stakeholders regarding the alternatives and the Level II Analysis will conclude with a preferred alternative, which will be studied in detail as part of the Level III Analysis.
- In the Level III Analysis (Recommended Alternative) Phase , the project team will refine the design and cost estimate for the preferred alternative and prepare 15% construction plans.
The construction of the proposed Red Mountain Freeway in the flood pool of the Spook Hill FRS presented an opportunity for the project team to develop an alternative that satisfied the non-jurisdictional objective and, at the same time, permitted a savings of over $30 million for ADOT.
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