SAN TAN VALLEY — The Pinal County Flood Control District is developing an area drainage master plan for San Tan Valley.
This study will identify flooding issues and develop strategies to mitigate flooding hazards within the growing San Tan Valley area. This study is the first step to generate a comprehensive flood mitigation plan for the San Tan Valley area. Once completed, the study will be used to determine and prioritize future flood mitigation projects. Major tasks include:
- Collecting data
- Seeking community input
- Acquiring topographic data
- Analyzing the Queen Creek watershed east of the Central Arizona Project canal
- Developing a hydraulic model to determine and depict existing flooding hazards
- Devising flood mitigation alternatives
- Recommending a flood mitigation plan
- Describing the watershed
The San Tan Valley watershed is approximately 64 square miles and includes portions of the town of Queen Creek, the town of Florence and the Gila River Indian Community. The watershed is bounded by the San Tan and Goldmine mountains to the west, the CAP canal to the east, the Magma Railroad to the south, and it extends just past Queen Creek Wash to the north.
The CAP canal has a high embankment with only two drainage crossings: along Queen Creek Wash and near the Magma Railroad. The land uses vary throughout the area, consisting of mountains and foothills, large-lot rural residential, agricultural fields and higher-density residential and commercial. San Tan Valley is a rapidly developing area with new subdivisions and commercial developments constantly being designed, permitted and built.
The county set up a survey for residents to report past flooding and submit photos and videos. This will help authorities create a database of known flooding locations and confirm hydraulic modeling within the project area.