Evaluated 450 CRS communities by tracking points earned from 1999 to 2009 and determined mitigation action impacts based on flood loss claims. Statistically controlled for multiple variables, including: proportion of floodplain, soil permeability, percent slope, precipitation, number of surge events, number of housing units, population, median household income, proportion of jurisdiction with impervious surfaces, area of jurisdiction, distance from coastline, year structure was built, and total count of insurance policies within flood zone. In doing so, the analysis found which flood mitigation activities significantly reduced flood losses.
Federal Emergency Management Agency (FEMA)
Brody, S. D., & Highfield, W. E. (2011). Evaluating the Effectiveness of the FEMA Community Rating System in Reducing Flood Losses, "Final Report for FEMA Mitigation Division Study, Phase 1".