Figure 4.3: Area 1, Area 2,and Area 3
CASE I: TRADITIONAL METHODS
Two USGS quad maps, Austin East (3097-242) and Pflugerville West (3097-243), were required to cover the study area of Buttermilk and Little Walnut watersheds. Measurements were all done by hand for the three differently sized areas, Area 1, Area 2, and Area 3.
The first watershed to be delineated was Area 2 (Buttermilk). The first step to determine Area 2’s boundary was to locate the outlet point from the USGS map. This point marks the confluence of Buttermilk with Little Walnut Creek watershed. Using a pencil, the watershed of Buttermilk was traced on the USGS maps. Secondly, the portion of Area 3 (Little Walnut) above its confluence with Area 2 was delineated. The subwatershed of Buttermilk was delineated last (Area 1). For each area the longest flow path was determined and traced with the pencil. Figure 4.4 shows the outlet point for Area 2 and Area 3.