Fig. 3. Section, township, and use area in relation to the monitoring site. A section is approximately 1.609 x 1.609 km (or 1 x 1 mi), which is numbered 1 through 36. A township consists of 36 sections, and is approximately 9.654 x 9.654 km (or 6 x 6 mi). The 5 x 5 and 7 x 7 use areas contain 25 and 49 sections, respectively, around the monitoring site.