BMPs and Load Reductions associated with BMAPs

BMPs and Load Reductions
associated with BMAPs
Julie Neurohr
6/4/2014
Shrub and Tree BMP Forum
Basin Management Action Plan
Basin Management Action Plan = BMAP
The Department’s tool used for implementing TMDLs
The “blueprint” for restoring impaired waters by reducing
pollutant loadings to meet the allowable loadings
established in the TMDL
i.e. Detailed allocations and projects on how the load reductions will be
accomplished
2
BMAP Process
• Develop collaboratively with local stakeholders
• Open meetings with public involvement
• Joint decision making with local partners
– Counties, Cities, Water Management District,
agriculture interests, environmental interests,
community interests, and others
3
Key BMAP Components
• TMDLs being addressed
• Defines area addressed by BMAP
• **Projects to meet the TMDL including:
– Implementation timeline
– Commitment to project
– Expected water quality improvement
4
Comprehensive set of strategies
• Waste water limits
• Urban BMPs
• Agriculture BMPs
• Conservation Programs
• Estimates future change
5
Project Requirements
Credit is only applied to projects that have treatment above and beyond
any permitted requirements
All projects must treat the parameter the TMDL addresses
All projects must be within the watersheds in the BMAP Boundary
All projects must be started and completed within the allotted time
frame
6
BMP Removal Efficiencies
Urban BMPs
• Most efficiencies based on data from Harvey
Harper and/or specific research projects
• Dependent on land uses in drainage area
7
Types of Projects
Standard stormwater treatment best management practices (BMPs) include:
– Retention BMPs
– Wet detention ponds
– Treatment trains
– Dry detention
– Baffle boxes (1st generation)
– Nutrient (2nd generation) baffle boxes
– Swales
– Alum injection
– Stormwater reuse
– Stormceptor devices
– Continuous deflective separation (CDS) units
– Street sweeping
– Catch basin inserts/inlet filters
– Septic tank phase out
8
BMP Efficiencies
Standard BMPs
Off-line Retention (based on
treatment volume)
Dry detention
Baffle box
Nutrient baffle box (2nd
generation)
Grass swales with swale blocks or
raised culverts
Grass swales without swale
blocks or raised culverts
Alum injection
Stormwater reuse
Stormceptor
Catch basins/inlet filters/Street
Sweeping
BMP treatment trains using a
combination of BMPs
TP % Reduction
TN % Reduction
40%-70%
10
2.3
40%-74%
10
0.5
15.5
19.05
Use on-line retention BMP values
Use on-line retention BMPs values
50% of value for grass swales with
50% of value for grass swales with
swale blocks or raised culverts
swale blocks or raised culverts
90
50
Estimate amount water not
Estimate amount water not
discharged annually because used for discharged annually because used for
irrigation.
irrigation.
13
2
FSA spreadsheet – based on the dry
FSA spreadsheet - based on the dry
weight or volume of material
weight or volume of material collected
collected annually
annually
Use BMP Treatment Train (TT)
Use BMP Treatment Train (TT)
equation:
equation:
BMP TT Efficiency = Eff1 +((1BMP TT Efficiency = Eff1 +((1Eff1)*Eff2)
Eff1)*Eff2)
9
BMP Efficiencies
Standard BMPs
Public Education
Floating islands/ Managed
aquatic plant systems (MAPS)
Muck removal/ restoration
dredging
Aquatic vegetation harvesting
TP % Reduction
TN % Reduction
1-6, depending on extent of program
1-6, depending on extent of program
20
Case-by-case depending on the
nutrient flux of the muck
Based on the total mass of material
collected, type of plant(s), and
associated nutrient content in the dry
material
20
Case-by-case depending on the
nutrient flux of the muck
Based on the total mass of material
collected, type of plant(s), and
associated nutrient content in the dry
material
10
BMP Removal Efficiencies
Agriculture BMPs
Most agricultural BMP efficiencies are based on a study by Del Bottcher
Participate in FDACS BMP program and receive presumption of
compliance with state water quality standards
Notices of Intent are submitted to Florida Dept. of Agriculture and
Consumer Services
11
Project Calculations
• Areas treated by each project outlined in GIS shapefile
• The map files are overlaid with the BMAP GIS model
and clipped
• The clipped information is used to calculate the total TP
loading (kg/yr) going to the project for treatment
• The load reduction for the project was then calculated by
multiplying the total load from the model by the project
efficiency
12
Example Project Credit Calculation
Superimpose
boundary of
BMP
Identify land
uses
13
Example Project Credit Calculation,
Continued
• Information:
– XX acres for drainage to BMP
– BMP type: 1” off-line retention (74% reduction)
– Total load without BMP = 11,155 lbs/yr TP (based on
land uses in drainage area)
• Calculation of Credit:
– 11,155 lbs/yr * 74% = 8,255 lbs/yr TP credit
14
Local Codes and Ordinances
• Up to a 6% credit for TN and TP is given off the
urban load for:
Local Codes and Ordinances
–
–
–
–
–
–
FYN (3%)
Landscaping (0.5%)
Irrigation (0.5%)
Fertilizer (0.5%)
Pet Waste (0.5%)
Educational Efforts (1%)
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Data
Research! Research! Research!
For BMAP credit, nutrient removal efficiency is
studied and submitted to FDEP
Credit will be awarded once nutrient removal
efficiencies have been determined
16
Questions?
Contacts:
Julie Neurohr, TMDL Coordinator
[email protected]
Kim Dinkins, Environmental Consultant
[email protected]
Jennifer Carpenter, Program Administrator
[email protected]
17
Example: Filter Marsh
Powell Creek Filter Marsh
Drainage basin = 1766 acres
Credit = 1693 lbs/yr TN
18

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