Theresa Basin Flood Control Study

Theresa Basin Watershed BoundaryCity of Deltona Public Works Department has commissioned a detailed drainage study of the Theresa Basin. The approximately 35-square-mile watershed includes the eastern half of the City of Deltona and is generally bounded by Doyle Rd (County Road 4162) to the south, Interstate 4 to the west, the Cities of DeLand and Lake Helen to the north, and the Deep Creek Basin to the east. The entire watershed lies within the St. Johns River Water Management District (SJRWMD) and includes portions of the Cities of DeLand and Lake Helen, as well as unincorporated Volusia County.

The Theresa Basin is hydrologically-closed; stormwater drains to a series of interconnected lakes which generally can only recover through groundwater recharge and evapotranspiration. This makes the basin particularly sensitive to large storm events like 2022’s Hurricanes Ian and Nicole, which raised water levels in the chain of lakes by up to 3.5 feet and resulted in widespread, persistent flooding that did not fully recede until the Spring of 2023.

Goals to be achieved under this effort include:

  • Update the City’s stormwater models to include more recent development since 2016
  • Produce a comprehensive planning tool for identifying and addressing flooding concerns in the watershed;
  • Develop and evaluate conceptual capital improvements and stormwater management strategies to reduce extent and duration of flooding for large storm events;
  • Update the 100-year flood zone maps to supplement existing FEMA products and/or support the amendment of current FEMA maps.

This website will serve as the dashboard for project status updates, upcoming public meetings, and public input requests. In addition, a short, pre-recorded public meeting presentation will be available on the website.

The City of Deltona will hold a public meeting on Wednesday, January 31st, 2024, from 6:00pm to 8:00pm at the Center at Deltona which can be attended either remotely using the provided Microsoft Teams link or in person at the venue listed below. The remote and in-person meetings will occur at the same time.

In-Person Meeting Venue

The Center at Deltona 1640 Dr. M.L.K. Blvd, Deltona, FL 32725. Please contact Tuan Huynh at 386-878-8970 or to reserve a seat at the in-person meeting as capacity is limited to 700 people. Seating availability will be provided on a first-come, first-serve basis.

Contact Us

There are several opportunities to submit questions and comments regarding this project. Comments are welcomed throughout this effort. All comments received by February 29, 2024 will become part of the public record.

Submit questions and comments via:

  1. E-mail: Tuan Huynh, P.E., City Engineer, at, Subject line: “Theresa Basin Flood Control Study – Public Feedback”
  2. Telephone: Call 386-878-8970 and cite your questions and comments under the “Theresa Basin Flood Control Study”
  3. U.S Mail: Deltona Water, Re: Theresa Basin Flood Control Study, 255 Enterprise Road, Deltona, FL 32725
  4. During the public meeting on Wednesday, January 31st, 2024.
  5. Using the Feedback Form below on this webpage.

ADA Accommodation: Persons with disabilities needing assistance should contact the ADA Coordinator, Kat Kyp, 48 hours before the meeting at (386) 878-8572. Public participation is solicited without regard to race, color, national origin, age, sex, religion, disability, or family status.