2011 water quality & ra compliance update
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2011 Water Quality & RA Compliance
Update
Ed SherwoodTampa Bay Estuary Program
100 Eighth Ave. SESt. Petersburg, FL 33701
TBEP Nitrogen Management Strategy
Reduce Nitrogen
Loads
Reduce Chloro-
phyll
ReduceLightAtten-uation
1998: NMC Partnership Formed to “Hold the Line”
1996-2009: NMC Projects Preclude >430t N / yr
2010: RA Accepted & Adopted by FDEP, N Load Allocations Voluntarily &Proactively Developed
2011+ : Demonstrating RA Compliance& Providing Input on Criteria Development
2012: RA Update!
2006: First-time All Segments Meet TBEP
Management Targets
Sea-grass
Recover
Adopted Compliance Assessment• NMC Action 1: Report attainment
of bay segment specific chlorophyll-a thresholds to FDEP and EPA over the 2007-2011 period.
• NMC Action 2: Report anomalous event(s) or data which influenced a chlorophyll-a exceedence over the 2007-2011 period to FDEP & EPA.
• NMC Action 3: Consider re-evaluation of bay segment assimilative capacities.
• NMC Action 4: Compile loading evaluations & identify potential further actions needed to achieve reasonable assurance for adopted bay segment allocations.
FDEP Recognized Site Specific Thresholds for Chlorophyll-a to Maintain Tampa Bay
Reasonable Assurance
• Hillsborough Bay: 15.0 ug/L
• Old Tampa Bay: 9.3 ug/L
• Middle Tampa Bay: 8.5 ug/L
• Lower Tampa Bay: 5.1 ug/L
Chlorophyll-a
Bay Segment Chlorophyll-a Compliance
Bay Segment
Chlorophyll-a(ug/L)
2011Average
FDEP RA Targets
Old Tampa Bay 11.4 9.3
Hillsborough Bay 11.2 15.0
Middle Tampa Bay 8.0 8.5
Lower Tampa Bay 4.3 5.1
YearOld Tampa
BayHills. Bay
Mid. Tampa Bay
Lower Tampa Bay
1974 No No No Yes
1975 No No No Yes
1976 No No No Yes
1977 No No No No
1978 No No No Yes
1979 No No No No
1980 No No No No
1981 No No No No
1982 No No No No
1983 No No No No
1984 Yes Yes No Yes
1985 No No No Yes
1986 No No Yes Yes
1987 No Yes No Yes
1988 Yes Yes Yes Yes
1989 No Yes Yes Yes
1990 No Yes Yes Yes
1991 Yes Yes Yes Yes
1992 Yes Yes Yes Yes
1993 Yes Yes Yes Yes
1994 No No No No
1995 No No No Yes
1996 Yes Yes Yes Yes
1997 Yes Yes Yes Yes
1998 No No No No
1999 Yes Yes Yes Yes
2000 Yes Yes Yes Yes
2001 Yes Yes Yes Yes
2002 Yes Yes Yes Yes
2003 No Yes Yes Yes
2004 No Yes Yes Yes
2005 Yes Yes Yes No
2006 Yes Yes Yes Yes
2007 Yes Yes Yes Yes
2008 Yes Yes Yes Yes
2009 No Yes Yes Yes
2010 Yes Yes Yes Yes
2011 No Yes Yes Yes
2007-2011 – 5 Year RA Compliance Period
Old Tampa Bay5-year Compliance Assessment
Bay Segment Reasonable Assurance Assessment Steps
DATA USED TO ASSESS ANNUAL REASONABLE ASSURANCE
OUTCOMEYear 1
(2007)
Year 2
(2008)
Year 3
(2009)
Year 4
(2010)
Year 5
(2011)
NMC Action 1: Determine if observed chlorophyll-a exceeds FDEP threshold of 9.3 mg/L
8.6 mg/L (No)
9.27 mg/L (No)
12.1 mg/L (Yes)
7.4 mg/L (No)
11.4 mg/L (Yes)
Chlorophyll-a threshold exceedences occurred during 2 non-consecutive years of assessment period, not necessary for NMC Actions 2-5.
NMC Action 2: Determine if any observed chlorophyll-a exceedences occurred for 2 consecutive years
No No No No NoChlorophyll-a exceedences did not occur in 2 consecutive years, not necessary for NMC Actions 3-5
NMC Action 3: Determine if observed hydrologically-normalized total load exceeds federally- recognized TMDL of 486 tons/year
N/A N/A N/A N/A N/ANot necessary due to observed water quality and seagrass conditions in the bay segment.
NMC Actions 4-5: Determine if any entity/source/facility specific exceedences of 5-yr average allocation occurred during period
Not necessary when chlorophyll-a thresholds met.
Hillsborough Bay5-year Compliance Assessment
Bay Segment Reasonable Assurance Assessment Steps
DATA USED TO ASSESS ANNUAL REASONABLE ASSURANCE
OUTCOMEYear 1
(2007)
Year 2
(2008)
Year 3
(2009)
Year 4
(2010)
Year 5
(2011)
NMC Action 1: Determine if observed chlorophyll-a exceeds FDEP threshold of 15.0 mg/L
8.3 mg/L(No)
11.6 mg/L(No)
14.6 mg/L(No)
9.8 mg/L(No)
11.2 mg/L(No)
All years below threshold, not necessary for NMC Actions 2-5
NMC Action 2: Determine if any observed chlorophyll-a exceedences occurred for 2 consecutive years
No No No No No All years met threshold, not necessary for NMC Actions 3-5
NMC Action 3: Determine if observed hydrologically-normalized total load exceeds federally- recognized TMDL of 1451 tons/year
N/A N/A N/A N/A N/ANot necessary due to observed water quality and seagrass conditions in the bay segment.
NMC Actions 4-5: Determine if any entity/source/facility specific exceedences of 5-yr average allocation occurred during period
Not necessary when chlorophyll-a thresholds met.
Middle Tampa Bay5-year Compliance Assessment
Bay Segment Reasonable Assurance Assessment Steps
DATA USED TO ASSESS ANNUAL REASONABLE ASSURANCE
OUTCOMEYear 1
(2007)
Year 2
(2008)
Year 3
(2009)
Year 4
(2010)
Year 5
(2011)
NMC Action 1: Determine if observed chlorophyll-a exceeds FDEP threshold of 8.5 mg/L
5.5 mg/L(No)
5.7 mg/L(No)
6.5 mg/L(No)
6.0 mg/L(No)
8.0 mg/L(No)
All years below threshold, not necessary for NMC Actions 2-5
NMC Action 2: Determine if any observed chlorophyll-a exceedences occurred for 2 consecutive years
No No No No No All years met threshold, not necessary for NMC Actions 3-5
NMC Action 3: Determine if observed hydrologically-normalized total load exceeds federally- recognized TMDL of 799 tons/year
N/A N/A N/A N/A N/ANot necessary due to observed water quality and seagrass conditions in the bay segment.
NMC Actions 4-5: Determine if any entity/source/facility specific exceedences of 5-yr average allocation occurred during period
Not necessary when chlorophyll-a thresholds met.
Lower Tampa Bay & Remainder LTB5-year Compliance Assessment
Bay Segment Reasonable Assurance Assessment Steps
DATA USED TO ASSESS ANNUAL REASONABLE ASSURANCE
OUTCOMEYear 1
(2007)
Year 2
(2008)
Year 3
(2009)
Year 4
(2010)
Year 5
(2011)
NMC Action 1: Determine if observed chlorophyll-a exceeds FDEP threshold of 5.1 mg/L
3.1 mg/L(No)
2.8 mg/L(No)
4.4 mg/L(No)
3.8 mg/L(No)
4.3 mg/L(No)
All years below threshold, not necessary for NMC Actions 2-5
NMC Action 2: Determine if any observed chlorophyll-a exceedences occurred for 2 consecutive years
No No No No NoAll years met threshold, not necessary for NMC Actions 3-5
NMC Action 3: Determine if observed hydrologically-normalized total load exceeds federally- recognized TMDL of 349 (LTB) / 629 (RLTB) tons/year
N/A N/A N/A N/A N/A
Not necessary due to observed water quality and seagrass conditions in the bay segment.
NMC Actions 4-5: Determine if any entity/source/facility specific exceedences of 5-yr average allocation occurred during period
Not necessary when chlorophyll-a thresholds met.
Tampa Bay Chl-a (2007-2011)
• Significant Pyrodinium blooms occurred in the summer of 2008, 2009 and 2011
2010 Seagrass Estimates
• All TB segments showed increased acreage
• Upper bay segments still have room to “grow”
Bay Segment Seagrass Targets
Old Tampa Bay
Hillsbor-ough Bay
Middle Tampa Bay
Lower Tampa Bay
Boca Ceiga Bay
Terra Ceia Bay
Manatee River
Tampa Bay Total
0%
20%
40%
60%
80%
100%
63%
50%
92%98%
110%
96% 110%
87%
Bay Segment
% A
tta
inm
en
t o
f B
ay
Se
gm
en
t T
arg
et
Ac
rea
ge
102% 176%
10,545 acres
1,663 acres
8,930 acres
7,030 acres
8,360 acres
1,045 acres
427 acres
38,000 acres
Seagrass Acreages
1950 1984 1988 1992 1996 2000 2004 2008 2012
Sea
gras
s C
over
age
(x1,
000
acre
s)
0
10
20
30
40 Seagrass Coverage Recovery Goal (38,000 acres)
32,897
Summary of Results• Water quality in Tampa Bay declined in 2011;
however, it still appears to support seagrass expansion in the majority of the segments
• Seagrass acreage in Tampa Bay continues to increase, next update anticipated at the end of 2012
• Targeted evaluation of appropriate management actions to undertake in Old Tampa Bay is ongoing
OTB Integrated Ecological Model• Initiated Fall 2011
• Model development anticipated in 2012 - mid 2013
• Management action scenario simulations Fall 2013 – Early 2014
• Final Report due
June 2014
http://www.swfwmd.state.fl.us/projects/old_tampa_bay/
Additional Background Slides
2009 RA Addendum
• Consortium developed and agreed to limits on nitrogen loads for 189 sources in Sept. 2009
• FDEP approved full RA Plan in December 2010
• Annual compliance assessments
Management Framework• Bay segment annual
average values compared to established bay segment targets for chlorophyll-a and light attenuation
• Results of each comparison placed into decision matrix framework
• Overall management response determined for each bay segment
Green
“Stay the course;” partners continue with planned projects to implement the CCMP. Data summary and reporting via the
Baywide Environmental Monitoring Report and annual assessment and progress reports.
Yellow
TAC and Management Board on caution alert; review monitoring data and loading estimates; attempt to identify causes of
target exceedences; TAC report to Management Board on findings and recommended responses needed.
Red
TAC, Management and Policy Boards on alert; review and report by TAC to Management Board on recommended types of
responses. Management and Policy Boards take appropriate actions to get the program back on track.
Chlorophyll-a
Light Attenuation
YearOld Tampa
BayHills. Bay
Mid. TampaBay
LowerTampaBay
1975 Red Red Red Green
1976 Red Red Red Yellow
1977 Red Red Red Red
1978 Red Red Red Yellow
1979 Red Red Red Red
1980 Red Red Red Red
1981 Red Red Red Red
1982 Red Red Red Red
1983 Red Yellow Red Red
1984 Red Green Red Yellow
1985 Red Red Red Yellow
1986 Red Yellow Red Green
1987 Red Yellow Red Green
1988 Yellow Green Yellow Green
1989 Red Yellow Red Yellow
1990 Red Green Red Yellow
1991 Green Yellow Yellow Yellow
1992 Yellow Green Yellow Yellow
1993 Yellow Green Yellow Yellow
1994 Yellow Yellow Red Red
1995 Red Yellow Red Yellow
1996 Yellow Green Yellow Green
1997 Yellow Green Red Yellow
1998 Red Red Red Red
1999 Yellow Green Yellow Yellow
2000 Green Green Yellow Yellow
2001 Yellow Green Yellow Yellow
2002 Yellow Green Green Green
2003 Red Yellow Green Yellow
2004 Red Green Green Yellow
2005 Green Green Yellow Yellow
2006 Green Green Green Green
2007 Green Green Green Green
2008 Yellow Green Green Yellow
2009 Yellow Yellow Green Green
2010 Green Green Green Green
2011 Red Green Yellow Green
BaySeg-ment
Chlorophyll-a(ug/L)
LightAttenuation (m-1) Resulting
Manage-ment
Response2011TBEPTarget
2011TBEPTarget
Old TB
11.4** 8.5 0.91** 0.83 Red
Hills.Bay
11.2 13.2 1.00 1.58 Green
Mid.TB
8.0* 7.4 0.66 0.83 Yellow
LowerTB
4.3 4.6 0.49 0.63 Green
2011 Results
*Small magnitude exceedence
**Large magnitude exceedence
TBEP Nitrogen Management Strategy
Reduce Nitrogen
Loads
Reduce Chloro-
phyll
ReduceLightAtten-uation
Sea-grass
Recover
Slope = 428 acres/yr
Slope = 660 acres/yr
20
22
24
26
28
30
32
34
36
38
40
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
Se
ag
ras
s A
cre
ag
e (
1,0
00
's o
f a
cre
s) Initial Estimate (Worst Case)
Previous Decade
Recent
Tampa Bay Seagrass Recovery Goal (38, 000 acres)
298 acres/yr
660 acres/yr
20
22
24
26
28
30
32
34
36
38
40
1980 1990 2000 2010 2020 2030 2040 2050
Sea
gra
ss C
ove
r (a
cres
x 1
,000
)
Observed Seagrass Coverage
Tampa Bay Seagrass Coverage Goal (38,000 acres)
2008 & 2009 Chlorophyll-a Spatial Distribution
2009 & 2010 Chlorophyll-a Spatial Distribution
2010 & 2011 Chlorophyll-a Spatial Distribution
2011 Chlorophyll-a Temporal Distribution
2011 Kd (Light Attenuation) Temporal Distribution
Questions?
Observed Seagrass Gains & Losses
2001-2004 2004-2006
2006-2008
Observed Seagrass Gains & Losses
2008-2010
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