Your WaterFlood and Stream ManagementWatershed and Environment

  • To view Zone 7's main page for Flood Protection & Stream Management, click here.
  • For Reports & Planning Documents, click here.
  • In 2014, the addition of new stream gauges to Zone 7's stream gauging network also facilitated real-time flow reporting for the public via the HydroSphere website found here.

streamflow-mapZone 7 owns and maintains 37 miles of local flood-protection channels, about a third of all the Valley's channels and creeks. The remaining channels are owned either privately or by other public agencies, which are responsible for repairs and maintenance.  Maps of Zone 7’s flood protection channels are available at the front counter of our administration building, located at 100 North Canyons Parkway in Livermore.

The Valley's flood-protection system begins at city-owned storm drains on local streets. Storm water flows through underground pipelines into creeks or man-made channels feeding into Arroyo Mocho, Arroyo las Positas and Arroyo del Valle. These larger channels converge with Arroyo de la Laguna, which ultimately drains into San Francisco Bay through Alameda Creek. In addition to flood protection, the channels also have recreational benefits and protect natural habitat.


Channel maintenance: To ensure that its flood-protection channels are ready for the next big storm event, Zone 7 conducts routine maintenance such as inspections, embankment and drain structure repairs, vegetation management, silt removal and pest control.


Emergency repairs

Zone 7 also administers an emergency response program that prepares us to act quickly and minimize the loss of life and property should a flood occur. For federally declared storm disasters, Zone 7 may apply for reimbursement from the Federal Emergency Management Agency or the U.S. Army Corps of Engineers.