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OVERVIEW 20 Many significant past and future decisions involving water quality are of national or regional scope. This broad scope arises for several reasons. First, hydrologic boundaries do not follow political boundaries. Therefore, water quality issues are often inter jurisdictional. , river basins, lakes, or aquifers, are large and fall within or are adjacent to more than one political unit. These systems are dynamic, flowing systems through which changes propagate over space and time, so that upstream decisions affect downstream users.

It must be stressed that these descriptions represent the extremes of a spectrum of approaches. In practice, it is rare to find an approach that is purely statistical or purely process oriented. Statistical approaches are most effective when they exploit an understanding of relevant physical processes, and statistical methods are essential tools for process modeling in the face of data uncertainty and model simplifications. Nonetheless, it is useful to distinguish between these two basic approaches, since the challenge in any given situation is to find the appropriate mix.

However, in the presence of a large unsaturated zone and/ or more organic soils, aldicarb may behave quite differently because of the potential for partitioning into the soil gas and organic solids. Designing management practices to control contamination by this pesticide and then evaluating those practices cannot be accomplished without understanding the mechanisms responsible for its fate and transport. A second example is the presence of selenium in agricultural drainage waters in such places as the San Joaquin Valley in California.

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