Revisiting the Adjustor Curves

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2018-12-18 3K 3 0 0

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Revisiting the Adjustor Curves

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Revisiting the Adjustor Curves

Anchor rates based on literature review

The “anchor rates” were the rates of percent Total Phosphorus removal based on the runoff treated in inches as was derived from the expert panel literature review.

Panel originally opted to use logarithmic


to fit the anchor rates

Discovered that a 5


order polynomial was actually a better fit to the anchor rates

Especially for larger amounts of runoff depth captured




Expert Panel report still reflects the log curve



in the FAQ document reflect the polynomial curve

Several state guidance documents use the curves from the panel report which reflects the “old” curves (log)


Next Steps

Recommend USWG makes a decision on which curves to use going forward

Need for consistency in the guidance being distributed


Logarithmic: changes to the


equations in the FAQ document (and some associated training materials)

Polynomial: the expert panel report should be revised to reflect

Model currently uses


curves; if changed to log could not be

reflected until 2015


Urban BMP Factsheets


Fact Sheet Topics

Basics of


Bay Pollutant Reduction Plans

Stormwater Retrofits

Stormwater Practices for New and Redevelopment Projects

Stream Restoration

Urban Nutrient Management

Erosion and Sediment Control

Residential BMPs (i.e. homeowner)

Septic Systems

Urban Filter Strips


Fact Sheet Contents

Practice Description

Best Places to Implement Them in Your Community

How to Find & Rank Candidate Sites

General Cost Estimation

What Technical Support is Needed

Brief Summary of How to Compute Credits


Community Benefits Provided

What to Report to State/Local Records to Keep

How to Verify Practice in Future

State Specific Info and contacts

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