Mapping Impervious for Stormwater Utilities: Why and How
Track: Water, Wastewater, and Stormwater
Authors: Carrie McCrea
Impervious area (IA) and derived factors, like intensity or developable area, are defensible foundations for stormwater and development-impact fees. How IA is generated, measured, and utilized for fees varies greatly; if misused it can lead to inequitable policy, lost revenue, inefficiency, and unhappy customers. The presentation discusses mapping methodologies and how qualities like source, accuracy, and coverage should influence use and rate-structure policy.