I'm working on a water-use efficiency project for several large commercial and institutional buildings and landscapes in Colorado. I'm trying put together a business case for a turf-replacement program, where the management would replace underutilized turfgrass landscapes with a more native, low-water demand plant selection. To make this case, I need to put together some data that shows the frequency of use by building occupants, employees, and visitors. This will help to identify which turfgrass areas are the best candidates for landscape retrofits.
Does anyone know of an observation methodology designed for frequency of use across several different areas?