PowerPoint Presentation


	These are the final land use maps for the watershed in 1954 (on the left) and 2002 (on the right). From these maps, we were able to calculate the area of the watershed comprised by each land use type.
	This data was used specifically in the calculation of the P budget, which will be discussed in the second half of the presentation. The maps were also used to make general inferences about the impact of each land use type of the water quality of the lake.
	Let’s look at a few quick things with these land use maps, and I will develop some of these further a little later.
	First of all, notice the gray area in the southwest of the 1954 land use map. This is a small area of the watershed which we did not have an aerial photo, so there is no land use data available for this area.
	It’s fairly obvious to see that the majority of the watershed is forest in both years. But also notice the difference I mentioned before between the mature and transitional forest classifications in the 1954 map (shown by the dark and light green colors), and the single forest classification for 2002 (shown by the single green shade). This again was because the 2002 photos were taken in April.
	The yellow areas in the maps represent residential land, which, as you can see, is much more prevalent in the 2002 map, and is concentrated around the lake shore.
	There are significantly more agricultural areas in the 1954 map, as you can see here on the western edge, here to the north of the lake, and here on the eastern edge of the watershed. In contrast, notice the very small amount of agriculture in 2002, just here on the western edge.
	Also, the roads of the watershed were digitized for the 1954 map in order to approximate the area under this land use type (the roads are shown by the black lines, mostly to the north of the lake). For the current roads of the watershed, however, we conducted a field survey to more accurately measure the road area. Thus, the roads are not digitized in the 2002 map.