Frequently Asked Questions (FAQ)

Before starting a hydrology study on the site indicated above I wanted to know what methods and programs the County of Los Angeles recognized. More directly does the county accept the hydrology study to be done by the AES program?

Public Works does not accept the AES program for hydrologic studies within the County. The AES software package has never been evaluated to determine if it calculates flow rates correctly using the Los Angeles County Modified Rational Method. The software packages accepted by Public Works are found in Chapter 15 of the 2006 Hydrology Manual available online at:

hydrology WRD SWE hydrology sedimentation hydraulic hydrological wells groundwater rainfall conservation depth precipitation alert gauges stormwater engineering