Reverse auctions for stormwater mitigation

Here's a study out of Cincinnati, Ohio where they did a reverse auction to ask people how much they had to be paid to take a rain barrel or rain garden on their property to reduce stormwater runoff in a small watershed. It is a good description of how to do this kind of thing to get people to adopt a new technology/approach, but the report stops short of providing monitoring results (in other words, do these things actually have a measurable effect on runoff in the watershed).

http://www.epa.gov/nrmrl/pubs/600r08129/600r08129.htm