These TMDLs address certain nutrient and DO impairments in the Kissimmee River Basin. Specifically, the nutrient and/or DO TMDL rules being proposed for adoption are for Lake Jackson, Lake Cypress, Lake Holden, Lake Kissimmee, and Lake Marian. These waterbodies were verified for nutrient impairments due to elevated chlorophyll a concentrations and due to low DO for Lake Jackson, using the methodology established in Chapter 62-303, F.A.C., Identification of Impaired Surface Waters. The methodologies used to develop the TMDLs were model simulations using the Hydrological Simulation Program – Fortran (HSPF) model. This rulemaking has been given an OGC case number 11-0653.