In this section

MFLs overview

Read an overview of the District’s MFLs program.

Fluctuating lake levels

Waters in Florida lakes naturally rise and fall over time. Learn why.

Priority list and schedule

Review the multi-year list of water bodies targeted by the District for development of MFLs.

Blue Spring, Volusia County:
Minimum Flow Regime

Learn about the history and development of this special District MFLs rule.

MFL documents

• Minimum flows and levels method of the St. Johns River Water Management District, Florida, U.S.A.
• Adopted minimum flows and levels (Rule 40C-8)
• Draft 2009 Priority Water Body List and Schedule
• Hydrology of Central Florida Lakes (USGS)
• Draft reports (public comment period extended to April 16, 2010)
  • Minimum Levels Determination: Lake Hiawassee, Orange County, Florida (draft 2009) (revised Feb. 5, 2010)
  • Minimum Levels Reevaluation: Sylvan Lake, Orange County, Florida (draft 2009) (revised Feb. 2, 2010)
  • Minimum Levels Reevaluation: Indian Lake, Volusia County, Florida (draft 2009) (revised Feb. 3, 2010)
  • Minimum Levels for Lake Avalon, Orange County, Florida (draft 2009) (revised Feb. 2, 2010)
  • Minimum Levels Reevaluation for Prevatt Lake, Orange County, Florida (draft 2009) (revised Feb. 2, 2010)

Minimum flows and levels program

Florida law (Chapter 373, Florida Statutes) requires Florida’s water management districts to establish minimum flows and levels (MFLs) for water courses, water bodies and aquifers that represent the limit at which further withdrawals would be significantly harmful to the water resources or ecology of an area. The St. Johns River Water Management District developed a multiple MFLs approach to define a long-term hydrologic regime necessary to prevent significant harm. Adopted MFLs are implemented through consumptive use permitting and water supply planning programs. A priority list and schedule for establishing MFLs is submitted annually to the Florida Department of Environmental Protection, as required by law.