What is the difference between permanent and temporary BMPs?

The distinction between permanent and temporary Best Management Practices (BMPs) is rooted in their intended use and duration of operation. Permanent BMPs are specifically designed for long-term applications within a developed area and are intended to address ongoing stormwater management needs after construction activities are completed. They help manage water quality and quantity in a sustainable manner, contributing to effective stormwater control for the lifespan of the project.

In contrast, temporary BMPs are utilized solely during the construction phase of a project. These practices are implemented to mitigate potential impacts on the environment—such as soil erosion and sediment transport—while the site undergoes development. They are not intended to remain in place after construction concludes; once the site is stabilized and the construction activities cease, these temporary measures are typically removed.

Understanding this fundamental difference helps in effective stormwater management planning, as it ensures that appropriate practices are applied at the correct stages of a project’s lifecycle.