Final answer:
Floodplain management involves policies, strategies, and actions to reduce the impacts of flooding and promote sustainable development in flood-prone areas.
Step-by-step explanation:
The Unified National Program for Floodplain Management defines floodplain management as the systematic and coordinated use of policies, strategies, and actions to minimize the adverse impacts of flooding and promote sustainable development in flood-prone areas. It involves a range of activities such as flood hazard assessment, land use planning, flood forecasting and warning systems, floodplain zoning, and infrastructure development. By implementing effective floodplain management measures, communities can reduce the risks posed by flooding and protect lives, property, and the environment.