42 U.S.C. § 17094 — Storm water runoff requirements for Federal development projects

This section is one undivided rule, with no lettered subsections. It applies whenever someone sponsors a development or redevelopment project on a Federal facility, but only if the project's footprint is larger than 5,000 square feet. For such a project, the sponsor must use site planning, design, construction, and maintenance strategies for the property. The goal of those strategies is to maintain or restore the property's "predevelopment hydrology" — in other words, how water moved across and through the land before the project changed it. Specifically, the sponsor must aim to keep or restore the temperature, rate, volume, and duration of water flow as close as possible to what they were before development. The law requires this only "to the maximum extent technically feasible," meaning the sponsor must do as much as is realistically achievable given the technology available, not necessarily achieve a perfect match.