Assessment of BMPs

BMP Effectiveness
View the effectiveness of each BMP as measured by percent of total reduction. Select geography, nutrient (nitrogen or phosphorus), and method used to compute the percent of reduction.

BMP Cost-Effectiveness
View the cost-effectiveness of each BMP on nitrogen and phosphorus as measured by cost/year to reduce a pound of each nutrient. Choose geography of interest.

Most Implemented BMPs
Display the implemented BMPs by BMP group for a geography of interest. Within each BMP unit, the BMP groups are sorted by the most units credited.

Overall Costs
Costs of all BMPs for 2019 and WIP3 are presented both graphically and as a table.

Notes:
All geographies are within the Chesapeake Bay Watershed. Documentation on how the costs are determined is located here.
Documentation on WIP3 isolation scenarios is located here.



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Percentages Based on Total Implementation
Total implementation percentages are the reduction in a nutrient for a specific BMP divided by the total reduction across all BMPs.
For each BMP, the formula for the unweighted percentage is:
   PT = 100 x (reduction in nitrogen for that BMP) / (reduction in nitrogen for all BMPs).

Percentages Based on 2019-WIP3 Implementation
2019-WIP3 implementation percentages are based on the total implementation percentages and adjusted by two factors. These factors are computed for each sector (agriculture, developed, etc.).
   Factor 1: F1 = (difference in load from 2019 to WIP3 for a specific sector) / (difference in loads from 2019 to WIP3 across all sectors)
   Factor 2: F2 = total of unweighted percentages for a specific sector
For each BMP, the formula for the 2019-WIP3 implementation percentage is:
   PW = (F1 / F2) * PT.


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2019 and WIP3 Implementation Costs
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