As an energy engineer focused on energy efficiency in the built environment, I am familiar with the standards and codes covering energy use in buildings; specifically ASHRAE 90.1, the "Energy Standard for Buildings," and IECC 2018, the "International Energy Conservation Code."
Recently several areas of increasing concern are intersecting with this work, such as indoor air quality, but also stormwater management:
Stormwater management is the effort to reduce runoff of rainwater or melted snow into streets, lawns and other sites and the improvement of water quality, according to the United States Environmental Protection Agency (EPA). (Source)
My question is what engineering codes and/or standards govern stormwater management in and around buildings?
Some teams we work with are concerned about how to manage the water which falls on the roof of the buildings they are designing. Are there guidelines related to collecting and/or treating this water before diverting it?
Note: my work is within the U.S., but I'm also interested to know of standards or codes that are in use in other countries.