2026 Hydrology Manual (Effective July 1, 2026) 

The following resources are available for download:

• San Diego County Hydrology Manual 2026 (PDF)
• Sediment Bulking Factor Technical Study (PDF)
• SDHydro Tool (Software)
• SDHydro Tool User Instruction (PDF)
• Slides from June 2026 Public Presentation of the 2026 San Deigo County Hydrology Manual (PDF)
• Public Presentation Recording (Also can be viewed below)
• Frequently Asked Questions (FAQ) - Under development; we’ll publish updates as new questions arrive

If you have trouble downloading the Hydrology Manual, please contact Beatriz Price at (858) 505-6334.

Helpful Information and Documents:

• County of San Diego Watershed Protection, Stormwater

Back to Main Flood Control Home Page

If you have questions or would like additional information, 
call the County Stormwater hotline at 1(888) 846-0800
or e-mail us at watersheds@sdcounty.ca.gov

Report a Stormwater Violation On-Line

If you see a County storm drainage system in need of maintenance, contact the County Department of Public Works Field Operations staff at (619) 443-1260 weekdays or contact the Stormwater Hotline at 1 (888) 846-0800.  For after-hours emergencies contact (858) 565-5262. 

COUNTY OF SAN DIEGO
Department of Public Works
Flood Control
 
5510 Overland Ave., Suite 410, MS O326
San Diego,  CA  92123,  USA
(858) 495-5318           Fax: (858) 495-5263