In response to federal and state mandates, the Port of San Francisco and San Francisco Public Utilities Commission are developing formal design guidelines for the minimization of stormwater pollution associated with new development and redevelopment in separately sewered areas of San Francisco. The result of this effort will be a Design Guidelines Manual for new development and redevelopment (“Stormwater Design Guidelines”). Once the Stormwater Design Guidelines are complete, the Port and SFPUC will codify them as requirements for new development efforts in separate storm sewer areas.

Here is a fact sheet in PDF for more information.