*2.2. Data*

The minimum and maximum elevation levels of the watershed are at 123.14 m and 497.74 m. The minimum and maximum temperatures in a year are around 10.3 ◦C and 28.9 ◦C. The average annual precipitation is found to vary between 1041 mm to 1346 mm. The stream water quality sampling stations are located between the latitudes 36.94◦ and 37.43◦ and longitudes −86.04◦ and −85.16◦. The water quality data is obtained by measuring samples collected from nearly 42 locations along the Green river monthly from May 2002 to October 2002. The stream network with sampling stations is shown in Figure 1, and the land use map of the watershed is shown in Figure 2. The climate parameters precipitation and temperature are obtained from Kentucky Climate Center. The two-day cumulative precipitation at each sampling location is computed by inverse distance weighted average procedure. The two-day cumulative precipitation, temperature at each sampling station are used along with the land use as inputs into the Decision Tree Classifier model. The six-month period includes a few rainy months and a few non-rainy months.

**Figure 1.** The stream networkand the sampling stations in the Upper Green River watershed.

**Figure 2.** Land Use Map of Upper Green River Watershed.
