Flooding has affected over two billion people since 1995. While gray infrastructure such as levees and dams has traditionally been used to mitigate this hazard, many communities are looking for approaches to augment or replace some of these structural solutions. Propelled by the regulatory support for green infrastructure approaches for stormwater management, some communities are also looking to green infrastructure for flood risk management (FRM). We apply the internal determinants and regional diffusion models to evaluate how floodplain management policies are evolving in place and diffusing through policy networks in several case studies from Oregon, US. We then develop several propositions as a way of focusing our findings on the community objectives and policy processes for FRM, contributing to the literature on policy innovation and adoption, and elucidating the nuances of these models for explaining FRM.

自1995年以来，洪水已经影响了超过20亿人。虽然传统上使用了堤防和水坝之类的灰色基础设施来减轻这种危害，但许多社区正在寻找增加或替代其中一些结构性解决方案的方法。在对用于雨水管理的绿色基础设施方法的法规支持的推动下，一些社区也正在寻求用于洪水风险管理（FRM）的绿色基础设施。在美国俄勒冈州的一些案例研究中，我们运用内部决定因素和区域扩散模型来评估洪泛区管理政策如何发展并通过政策网络进行扩散。然后，我们提出一些建议，以将我们的发现集中在FRM的社区目标和政策流程上，为有关政策创新和采用的文献做出贡献，