Section 373.042, F.S., requires the District to establish minimum flows and levels for lakes, wetlands, rivers and aquifers within the District’s boundaries. Section 373.0421(3), F.S., further requires the District to periodically reevaluate and revise adopted minimum flows and levels. This rulemaking is necessary to adopt new guidance and minimum levels for Lakes Church and Echo, located in Hillsborough County. The establishment and periodic evaluation of minimum levels is required by statute to ensure that the minimum hydrologic requirements of the water resources and ecology of these lakes are maintained. The revised minimum and guidance levels for Lakes Church and Echo are being developed using previously peer-reviewed, Governing Board adopted methods.