Post on 06-Aug-2020
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Waterbody Restoration Goal
Source: Final TMDL Report, Nutrient
TMDL for Alachua Sink, WBID
2720A, April 4, 2006
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Understanding Pollutant Sources
ANNUAL TOTAL NITROGEN LOADS (kg/yr) FROM BASEFLOW,
SURFACE WATER RUNOFF & SEPTIC
Total = 568,369
Baseflow
Surface WaterRunoff
Septic
387,511
97,383
83,475
Total = 374,560
354,000
20,560
Total = 344,180
211,520
44,910
87,750
How controllable is each source?
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Identifying Existing Treatment
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Exhaust Least-Cost Options First
Source Controls, Pollutant Trading,
Some LID Measures
Regional or Large-Scale
BMPs
Smaller-Scale BMPs
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Planning of Individual BMPs
THIS IS NOT
FOR NEW
DEVELOPMENT!
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Planning of Individual BMPs
Awareness of multiple purposes
Lowest $/lb-removed life cycle costs
Economies of scale
Treatment trains and LID/GI
Permitting and water quality reasonable assurance
O&M and sustainability considered
Consideration of grant funding
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Optimizing BMP Design
What is Treated?
How Much is Treated?
What Treatment Technologies
Should Be Used?
Site-Specific Optimization
What Level of Treatment Should Be Provided?
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What is Treated?
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How Much is Treated?
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What Treatment Technologies
Should Be Used?
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What Treatment Technologies
Should Be Used?
vs.
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What Level of Treatment
Should Be Provided?
Harper and Baker, 2007
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What Level of Treatment
Should Be Provided?
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Site-Specific Optimization
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Site-Specific Optimization
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Prioritization
Flood protection
Water quality
Natural systems
Alternative water supply
Flexibility factors
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Evaluating Across Multiple Areas of
Responsibility