John Scarpulla of the San Francisco Public Utilities Commission explained how the sidewalk landscaping planter works as a tidal flow wetland while he led a tour of the SFPUC Headquarters for the Net Positive Energy and Water Conference attendees. (Photo by Mignon O’Young)

John Scarpulla of the San Francisco Public Utilities Commission explained how the sidewalk landscaping planter works as a tidal flow wetland while he led a tour of the SFPUC Headquarters for the Net Positive Energy and Water Conference attendees. (Photo by Mignon O’Young)

John Scarpulla of the San Francisco Public Utilities Commission explained how the sidewalk landscaping planter works as a tidal flow wetland while he led a tour of the SFPUC Headquarters for the Net Positive Energy and Water Conference attendees. (Photo by Mignon O’Young)