A first-of-its-kind article coauthored by scholars at Resources for the Future (RFF) and Columbia University in the journal American Economic Review finds that the loss of a hectare of wetlands (roughly the size of two and a half football fields) costs society an average of $1,900 in flood damages per year. In developed areas, that figure jumps to more than $8,000.
source https://www.lifetechnology.com/blogs/life-technology-science-news/losing-a-hectare-of-wetlands-could-cost-upward-of-8-000-in-flood-damages