The objectives of this research were to: (1) determine the conditions under which the results of BMP effectiveness studies can be  accurately transferred from one geographic area to another, (2) determine a standardized study design as well as standardized protocol for the collection of  data  so that evaluation study findings are comparable nationally, and (3) investigate the feasibility of establishing a central repository for post-construction stormwater quality research studies to facilitate the exchange of BMP effectiveness information. 

This study evaluated state practices for assessing BMPs, reviewed BMP effectiveness data applicable to highway runoff, evaluated variables potentially affecting data transferability, and assessed the feasibility of establishing a highway BMP database. These were all accomplished to answer the following questions:

·         What BMP performance monitoring studies applicable for highways are available in data clearinghouses and as published literature?

·         What are the observed effects of geographic variables on highway BMP performance?

·         How can highway BMP performance monitoring evaluations be standardized?

·         What recommendations can be provided for assessing the feasibility of establishing a BMP performance monitoring study central repository for transportation agencies?

The final agency deliverables from the project are available as follows:

Agency Final Research Report documenting the research project.

https://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP25-25(92)_FR-wAppendices.pdf

PowerPoint Slide Presentation summarizing the project and its findings.

https://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP25-25(92)_Final_Presentation.pptx

Further work is anticipated to implement the findings of this project.  Discussions are underway to make enhancements to and create a state DOT portal for the International Urban Stormwater BMP Database, managed by the Water Environment Research Foundation.