Here's a story from Reuters about command-and-control regs on hog farms that are intended to improve water quality (in Manitoba). This is clearly an interesting application of cost-benefit analysis.
What are the benefits of tighter restrictions? Are these values market or non-market? For the non-market components, what valuation procedures might be used to estimate the monetary value of better water quality?
What are the costs of the restrictions? How might they be estimated?