NOTICE: The fourth edition of the Hydrology Manual was approved and adopted by the Flood Control District of Maricopa County Board of Directors on November 18, 2009. This edition was revised on June 14, 2010 to correct several typographical errors, and on February 10, 2011 to add additional detail to Table 2.2. Refer to the Revisions section of the Hydrology Manual for more detail.
The objective of the Drainage Design Manual, Hydrology, is to provide criteria and design guidance for estimation of peak discharges and runoff volumes for use in identifying flood hazards and design of drainage facilities in Maricopa County. This manual provides a convenient source of technical information that is specifically tailored to the unique hydrologic, environmental and social character of Maricopa County; and a consistent set of criteria that, when used by the local governing agencies and the land development community, will result in uniform drainage practices throughout the County.
The fourth edition of the Hydrology Manual does not include agency-specific policies and standards. It only contains technical guidance.
Comments on the Hydrology Manual are encouraged and should be directed to:
Special Projects Branch Manager
Flood Control District of Maricopa County
2801 W. Durango Street
Phoenix, AZ 85009
It is preferred that comments be submitted to Mr. Loomis by e-mail.
The fourth edition of the Manual is only available in a digital PDF (Portable Document File) format, which requires the free Adobe Reader to view. To save the document directly to your hard drive, right click on the link and select "Save Target as." If you do not already have the Adobe Reader, click on the following Adobe link: