Data Resources Hydrologic Reports
Environmental Resources Section - publishes an Annual Hydrologic Data Report containing
data dating back as far as the late 1800s. New data are added each year from 66
reporting (via radio telemetry) rain gages, 14 recording, non-reporting rain gages,
33 non-recording, cooperative observer (maintained by volunteers) rain gages, and
36 reporting water level stations.
These hydrologic data, coupled with satellite and radar tracking of storms, are
used for flood detection, allowing maintenance crews to be assigned to potential
problem areas. The result is a better allocation of resources and enhanced public
safety. The data are also used for a variety of other municipal purposes by the
private sector.
If there are any questions regarding the details of a document, or to obtain a hard
copy or other alternative formats of the original document, or to have a document
read to you, please contact the OC Public Works offices, Monday through Friday,
7:00 am to 5:00 pm PST, at 2301 N. Glassell St., Orange, CA, 92865 by email at  watershed,
or by phone at  (714) 955-0600. Precipitation Section
2004-2005 Annual Hydrologic
Data Report
2004-2005 Annual Hydrologic
Data Report Streamflow
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