- Rainfall Distribution Study, September 2014
- Evaluation C Values
- Initial Time of Concentration
- Report on the Calibration Analysis for the San Diego County Hydrology Manual, May 2007.
- San Diego Unit Hydrograph
Original 2003 version for Windows XP
Updated 2009 version for Windows Vista and Windows 7
Hydrograph (RATHYDRO) software
Note: RATHYDRO was not updated for Windows 7 (or later) operating systems. The County is updating our Hydrology Manual, after which RATHYDRO will be retired and replaced with a new tool because the current intensity equation that is built into RATHYDRO will be retired and NOAA Atlas 14 will be adopted. However, a target date has not been set for the Hydrology Manual update. In the meantime you may be able to make RATHYDRO work by saving the RATHYDRO files in the “program files” directory vs. the default “program filesx86” directory. Some other options to perform the calculations and create a rational method hydrograph include (1) install and use RATHYDRO on an old 32 bit machine, or (2) create your own tool in an Excel spreadsheet using the equations provided in Chapter 6 of the Hydrology Manual.
Helpful Information and Documents:
If you have questions or would like additional information,
call the County Stormwater hotline at 1(888) 846-0800
or e-mail us at email@example.com
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.
OF SAN DIEGO
Department of Public Works
5510 Overland Ave., Suite 410, MS O326
San Diego, CA 92123, USA
(858) 495-5318 Fax: (858) 495-5263