In order to prevent or reverse degradedwater quality, pollution control
policies must be effective (where policy effectiveness is defined as
the degree to which a particular policy, once implemented, achieves
its intended purpose). Policy effectiveness depends upon how well
pollutant controls affect pollutant fluxes directly, and therefore water
quality indirectly.While the strength of these physical linkages is of critical
importance, the extent to which humans adhere to a control policy
is equally critical. Often, proposals for implementing pollution controls
focus on the science of the physical linkages, assuming that humans
will fully comply with any adopted controls (Spillane et al., 2002).