With every storm, rain carries pollutants from roofs, parking lots, pavement, and other impervious surfaces onto streets and into storm drain inlets. These curb openings provide a path for polluted stormwater runoff to flow into the City storm drain system and into local creeks and the San Francisco Bay without removal or treatment. These storms are associated with ponding concerns throughout the City and may erode creeks and compromise the structure of our creek channels.