Background “I’m a novice AQUARIUS user, ” says Sean Kruger, an Environmental Program Scientist with the South Dakota Department of Environment and Natural Resources. “It would be a stretch to say I have the time to look at it once a week. This was my rst attempt at using the Empirical Modeler, and the fact that in two days I could come up with a working model that recreates 30 years of data—it speaks very well of the software’s ease of use. ” The model that he developed, with the help of an associate, was pivotal in a recent state board decision regarding a lake’s water use. Kruger and his department provide technical assistance to the state’s water users, primarily in areas of water quality, including nonpoint source pollution and the development of TMDL (Total Maximum Dai

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