Project Details

Gila Bend Area Drainage Master Plan Update

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Project Contact: Valerie Swick
Region: SW
District: 5 - Steve Gallardo
Phase: Planning & Studies

Gila Bend ADMP Update
The off-site hydrology was updated using the current NOAA 14 rainfall depths. The on-site hydrology is analyzed using two-dimensional analysis to better determine where the stormwater is ponding, especially upstream of the Gila Bend Canal. The study area for the two-dimensional analysis includes the area south of Interstate 8 (for about 1.5 miles to the south), State Route 85 to the west, Indian Road to the north, and approximately Butterfield Trail to the east. The area is about eight square miles.

This update to the original study will analyze the recommended stormwater facilities to determine if they are still needed as well as any modifications to the original concepts.

The Updated Gila Bend ADMP
The revised ADMP recommends focusing efforts on the Sand Tank Wash levee, the Bender Wash overchute over the Gila Bend Canal, and the Scott Avenue Wash levee. The District with work with the Town to develop opportunities for funding the projects.

Original Gila Bend ADMP (completed in 2002)
The purpose of the original Gila Bend ADMP was:

  1. To identify existing drainage problems and to develop corrective measures.
  2. To develop an overall drainage plan that would provide a tool to ensure that future growth provides adequate stormwater conveyance without adversely impacting existing development.
The planning area covered approximately 48 square miles bounded by the Gila River to the north, Citrus Valley Road to the west, Barry Goldwater Gunnery Range to the south, and the section line east of the Gila Bend Municipal Airport to the east. At the time the study was initiated, there had been a considerable amount of land development interest in this area. The Gila Bend ADMP provides the the town of Gila Bend with structural and non-structural recommendations to properly plan for the stormwater conveyance needs of the anticipated growth.

The ADMP identified three broad recommended solutions: a set of floodwater management tools for guiding future development, flood control structures to be implemented by development, and flood control structures to be publicly funded. The third component centers on recommended improvements on Sand Tank Wash, including reconstruction of the Sand Tank Wash levee upstream of the Gila Bend Canal, and construction of a Gila Bend Canal overchute on Bender Wash, a retention basin upstream of Interstate 8 and an upstream floodwater detention facility.


The District updated the hydrologic model and the mitigation plan for the Gila Bend Area Drainage Master Plan (ADMP) watershed in April, 2015. The purpose of the update was to: update the hydrologic models from the Gila Bend ADMP using the new NOAA 14 rainfall depth and the latest version of the DDMSW; identify any significant differences between the existing and the updated hydrologic models; and make recommendations for need of further analyses.

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