Ventura County Watershed Protection District

Welcome to the Hydrology Section Homepage
Planning and Regulatory Division

The Historical Rainfall and Hydrologic Data webpage has been moved to the new WISKI Web data server. This new site offers additional data and is updated more often than our old site. Official Data Reports are available in formatted text reports and comma-delineated files for importing into a spreadsheets. The Official Data Reports are updated when the records have been checked and finalized. Preliminary Data are made available between Official Report updates, but are subject to revision as the data are checked. Please read our Frequently Asked Questions about the new website and the data it provides..

For certified data, hydrology studies, or any other hydrology request please fill out the Data Request Form and e-mail it to HydroData@ventura.org. 

Available Data

Current Rainfall Information (Storm Watch)

Historical Rainfall and Hydrologic Data - Includes rainfall, stream flow, stream peaks, and evaporation data.

Hydrology Section Materials

Debris Basin Manual (PDF, 22.4MB) - Contains information on Debris and Detention Basins maintained by VCWPD.

Updated Hydrology Manual 2006 (PDF, 10.4 MB) - Contains information on Modified Rational Method used by VCWPD.

Zipped Appendix E Files for Hydrology Manual (ZIP, 65 MB) - PDF and GIS files for use in hydrology studies.

Tc Calculator Manual - Revised 11/2007 (PDF, 0.5 MB) - Describes Tc Calculator program for use in hydrology studies.

VCRat 2.5 and Tc Calculator Programs available for download: Version: 2.5.2007.2 - Updated 2/21/2007. Also includes manuals. (ZIP,34.8MB)

VCRat 2.5 and Tc Calculator Training Materials - Updated 11/2007. (ZIP,1.8MB)

Warning: VCRat 2.5 is NOT compatible with the new Windows Vista Operating System. VCRat 2.5 and the TC Calculator has not been verified to be able to run on computers that contain the Vista Operating System. VCRat 2.5 should not be installed on computers with Vista.

Training Schedule: No training classes are offered at this time. Individual training is available at $75.00/hour and can be scheduled by calling Mark Bandurraga at (805) 654-2003.