Everglades Agricultural Area BMP Replacement Water Chapter 40E-63, F.A.C, Part II Rule Development Public Workshop August 28, 2006 Rule Development Public Workshop August 28, 2006

Rule Development Consensus among interested stakeholders and District staff that BMP Replacement Water should be re-visited July 2006, authorization to enter into Rule Development was provided by District Governing Board to amend the EAA replacement water methodology Consensus among interested stakeholders and District staff that BMP Replacement Water should be re-visited July 2006, authorization to enter into Rule Development was provided by District Governing Board to amend the EAA replacement water methodology

EAA BMP Replacement Water Required by 1994 Everglades Forever Act and Everglades Settlement Agreement Everglades Hydroperiod Restoration & Improvement Component Runoff water from EAA would be lost due to BMP implementation Required by 1994 Everglades Forever Act and Everglades Settlement Agreement Everglades Hydroperiod Restoration & Improvement Component Runoff water from EAA would be lost due to BMP implementation

Original EAA BMP Assumption Water retention in EAA due to implementation of BMPs would equal 20% of total base flow that was discharged from the EAA from 1979 through 1988 (pre-BMP period) pre-BMPpost-BMP

EFA Mandate Replace reductions of flow to EPA from BMP implementation Develop a model for quantifying the amount of water to be replaced Distribution and timing of replacement water should maximize natural balance of EPA Replace reductions of flow to EPA from BMP implementation Develop a model for quantifying the amount of water to be replaced Distribution and timing of replacement water should maximize natural balance of EPA

Replacement Water Implementation The District implemented a BMP Replacement Water rule under Chapter 40E-63, part II (F.A.C) to carry out the EFA requirement Effective since 1995 Minor changes since then to add new EAA structures The District implemented a BMP Replacement Water rule under Chapter 40E-63, part II (F.A.C) to carry out the EFA requirement Effective since 1995 Minor changes since then to add new EAA structures

EAA Runoff Trend Pre-BMP Period Higher Variability Post-BMP Period Reduced Variability Higher Average Runoff Pre-BMP Period Higher Variability Post-BMP Period Reduced Variability Higher Average Runoff

Runoff Conveyance Changes Increase in EAA Runoff Directed to the EPA Decrease in EAA Runoff Directed to Lake Okeechobee Increase in EAA Runoff Directed to the EPA Decrease in EAA Runoff Directed to Lake Okeechobee

Replacement Water Estimates Current Modeling Method Runoff Reduction Observed < Predicted Chart values > 0 Runoff Increase Observed > Predicted Chart values < 0 Runoff Reduction Observed < Predicted Chart values > 0 Runoff Increase Observed > Predicted Chart values < 0

Reason for Rule Amendments Runoff Trend Long-Term analysis of rainfall and flow data from the EAA collected between 1965 and 2000 indicates no reduction in flow since BMP implementation Conveyance Changes More EAA runoff is being directed south to EPA Runoff Trend Long-Term analysis of rainfall and flow data from the EAA collected between 1965 and 2000 indicates no reduction in flow since BMP implementation Conveyance Changes More EAA runoff is being directed south to EPA

Reason for Amendments (contd) Concern over competing demands on Lake Okeechobee; do not want to overestimate demands Concern over Lake Okeechobee water quality and its use as makeup water in EPA Concern over competing demands on Lake Okeechobee; do not want to overestimate demands Concern over Lake Okeechobee water quality and its use as makeup water in EPA

Goal of Rule Amendments Modify model (rule) to more accurately reflect post BMP conditions Ensure that model can also account for EAA Reservoir Project changes to system and selected Regional Feasibility Study Alternative Modify model (rule) to more accurately reflect post BMP conditions Ensure that model can also account for EAA Reservoir Project changes to system and selected Regional Feasibility Study Alternative

Additional Information Technical Contact: Stuart Van Horn, (x6628), Rule Procedural Questions: Joyce Rader, (x6259), Visit the SFWMD Rulemaking website at Go to: What We Do => Permitting => Rules, Statutes, & Criteria => Rulemaking Technical Contact: Stuart Van Horn, (x6628), Rule Procedural Questions: Joyce Rader, (x6259), Visit the SFWMD Rulemaking website at Go to: What We Do => Permitting => Rules, Statutes, & Criteria => Rulemaking