Over the past 150 years, land-use changes from native ecosystems to row crop corn and soybeans have negatively impacted a variety of ecosystem services across the US Corn Belt, including nutrient attenuation, water storage, and habitat. Restoring floodplains in agriculturally dominated landscapes through United States Department of Agriculture Natural Resource Conservation Service programs (e.g., Emergency Watershed Protection program) could offer disproportionate opportunities to positively enhance ecosystem service benefits, yet identifying and prioritizing opportunities for conservation practices, including floodplain easements, to maximize environmental outcomes and financial resources remain challenging. This research sought to identify, prioritize, and evaluate costs associated with potential floodplain easements across the state of Iowa. Leveraging key geospatial data and criteria, including proportion of field within the 2- and 5-year flood return interval, field boundaries, and land use characteristics, we identified 141,314 floodplain easement opportunities of which 2707 were identified as high-priority locations based on the inundation frequency of the fields, representing a total area of 56,300 ha. To estimate acquisition, direct, and total costs associated with potential easements, we used soil and crop productivity index information, land value data, historic vegetation information, and partial enterprise budgets. Estimated costs to restore only high-priority easement opportunities totaled nearly 84.8 million USD annually. This approach aimed to develop an accessible approach to assist natural resource practitioners and conservation planners in identifying, prioritizing, and estimating costs for potential floodplain easement locations across the state of Iowa and in other regions where data exist.
Karnish et al. (Sat,) studied this question.