Everglades Agricultural Area

BMP Replacement Water

Chapter 40E-63, F.A.C, Part II

Everglades Agricultural Area

BMP Replacement Water

Chapter 40E-63, F.A.C, Part II

Rule DevelopmentPublic Workshop

August 28, 2006

Rule DevelopmentPublic Workshop

August 28, 2006

Rule DevelopmentRule 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 WaterEAA BMP Replacement Water

Required by 1994 Everglades Forever Actand EvergladesSettlement Agreement

Everglades Hydroperiod Restoration & Improvement Component

Runoff water from EAA would be lost due to BMP implementation

Required by 1994 Everglades Forever Actand EvergladesSettlement Agreement

Everglades Hydroperiod Restoration & Improvement Component

Runoff water from EAA would be lost due to BMP implementation

Original EAA BMP Assumption

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)

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)

May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr

pre-BMP post-BMP

EFA MandateEFA 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

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 TrendEAA Runoff Trend

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

Water Year (Oct. 1st to Sept. 30th)

Ru

no

ff (

kac-

ft)

post-BMP Average(1,128 kac-ft)

pre-BMP Average (baseline)(1,029 kac-ft) 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

Runoff Conveyance Changes

Percentage of EAA Runoff Flowing South to EPA

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

Water Year (Oct. 1st to Sept. 30th)

post-BMP Average(94%)

pre-BMP Average (baseline)(85%

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 EstimatesCurrent Modeling Method

Replacement Water EstimatesCurrent Modeling Method

EAA Runoff Percent Reductions

-60%

-50%

-40%

-30%

-20%

-10%

0%

10%

20%

30%

40%

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

Water Year (Oct. 1st to Sept. 30th)

Red

uct

ion

(%)

Yearly Percent Reductions 5 Year Percent Reductions

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

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 (cont’d)

Reason for Amendments (cont’d)

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 AmendmentsGoal 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 InformationAdditional Information

Technical Contact: Stuart Van Horn,

561-686-8800 (x6628), svanhorn@sfwmd.gov

Rule Procedural Questions: Joyce Rader,

561-686-8800 (x6259), jrader@sfwmd.gov

Visit the SFWMD Rulemaking website at

http://www.sfwmd.gov

Go to: What We Do => Permitting => Rules, Statutes, & Criteria => Rulemaking

Technical Contact: Stuart Van Horn,

561-686-8800 (x6628), svanhorn@sfwmd.gov

Rule Procedural Questions: Joyce Rader,

561-686-8800 (x6259), jrader@sfwmd.gov

Visit the SFWMD Rulemaking website at

http://www.sfwmd.gov

Go to: What We Do => Permitting => Rules, Statutes, & Criteria => Rulemaking