Project Details

Upper East Fork Cave Creek ADMS Update

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Project Contact: Tim Murphy
Region: N
District: 3 - Bill Gates

The Upper East Fork Cave Creek Area Drainage Master Study Update is a regional drainage study to be conducted in north central Phoenix by the Flood Control District of Maricopa County. The study will analyze a 17 square mile area bounded by the Central Arizona Project canal to the north, Cave Creek to the west, the Middle Indian Bend Wash ADMS to the east and the Arizona Canal Diversion Channel ADMS to the south (see study area map). The area is mainly residential with commercial corridors along major roadways.

When the area was last studied by the District in 1986, just over half of the area was developed, with about one third of the area within the jurisdiction of Maricopa County. Over the past 25 years, most of the area has been developed and the entire area has been annexed by Phoenix. As a result, the population in the area has increased dramatically. There are approximately 47,500 structures in the study area and the estimated population is 97,500. The study needs to be updated to reflect the changes in the area using updated, detailed 2-foot contour mapping and a more technically sound approach to hazard identification.

The purpose of the study is to investigate, identify and assess existing flooding problems. A comprehensive list of known flooding problems impacting the study area will be developed through flooding information provided by the city of Phoenix, as well as a review of previous drainage studies that have identified drainage issues. Public meetings will also be held to gather information on flooding problems from study area residents.

A FLO-2D model will be used to develop the hydrologic and hydraulic information. The updated 2-foot contour mapping developed for the study will be used in the development of the FLO-2D models. The 100-year and 10-year 6- and 24-hour storms will be considered. The final products of the FLO-2D models will be a series of maps depicting flow rates and flow depths for the study area.

A Hazus model will also be developed to determine the number of structures that could be damaged by flooding, and the dollar value of the damages.


The study was completed in December 2017.

The consultant prepared Fact Sheets for the Northtown Community and the Sandra Terrace areas. These Fact Sheets were shared with City of Phoenix and others, and are available in the Document Section. All of the study findings and modeling results have been shared with the City of Phoenix. The Final Report along with the FLO-2D and Hazus models have been placed in the District's library.

The ADMS study started in March 2015 with the consultant initially focusing on collecting existing data for the entire study area and development of the FLO-2D models. After completion of the FLO-2D models the District and City reviewed the results and worked with the consultant to identify the most at risk areas, and develop solutions for a few select areas.

On June 13, 2017 a presentation was made to the Northtown HOA Board, and on June 21, 2017 there was a meeting with the property owners along Sandra Terrace and Paradise Lane between 14th and 16th Street. Copies of these presentations are available in the Document Section.

Near the end of the study the consultant was tasked with developing several additional mitigation measures for the Northtown Community that focused on providing relief from smaller and more frequent flood events. While these additional mitigation measures may not provide much relief during the 100-year event, they are less costly and the Northtown Community might be able to implement some of these measures. Several of these additional measures are included in the Fact Sheet for the Northtown Community.

In the Document Section there are several FEMA publications that have information on ways homeowners can use retrofitting techniques to reduce flooding damage to their homes and utilities. Several of these methods may require permits from the City and the use of a Registered Professional Engineer. The City should be contacted before undertaking any of these retrofitting techniques.

Available Documents

Document Name Type Size
Fact Sheet - Northtown Community December 2017 PDF 5 MB
Fact Sheet - Sandra Terrace December 2017 PDF 3 MB
FEMA - Homeowner Guide To Retrofitting - Brochure 2009 PDF 1 MB
FEMA - Homeowner's Guide To Retrofitting - Publication 2014 PDF 54 MB
FEMA - Protecting Building Utility Systems From Flood Damage PDF 39 MB
Northtown HOA Board PowerPoint Presentation June 13, 2017 PDF 4 MB
Sandra Terrace Area PowerPoint June 21, 2017 PDF 5 MB
Study area map PDF 1 MB
Study Area Map 2017 PDF 0.2 MB

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