Overspray from sprinklers that are on the edge of sidewalk or other hard surface can produce run-off and wasted water in less than one minute of run-time. When sprinklers are needed to water turf areas, Monterey Bay Friendly Landscapes are designed so that sprinklers are set back at least 24" from sidewalks and driveways.
Certification Requirement
Overhead sprinkler systems are set back 24” from non-permeable surfaces unless:
1) Non permeable surfaces are designed and constructed to drain entirely to landscaping and
2) Landscape area is adjacent to and drains to a permeable surface
Reference
CA Water Efficient Landscape Ordinance
http://www.water.ca.gov/wateruseefficiency/landscapeordinance/
