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Drainage Review Request
Drainage Administration is one of the regulatory activities that the Planning and Development Department provides for the benefit
of the residents of unincorporated Maricopa County. This activity ensures compliance with the drainage regulations for Maricopa County.
The purpose of these regulations is the reduction of existing and potential flooding caused by local stormwater.
The Drainage Regulations apply to all development of land conditions that may affect drainage systems and patterns. The regulation
defines a drainage system as any system or feature over which storm waters flow and development as any man made change to the property.
This regulation also has the definition of drainage as runoff which flows over land as a result of precipitation. This definition
includes sheet flow and flows which may be concentrated, with or without a defined channel.
For purposes of obtaining a drainage clearance, Planning and Development Services, applicants shall use the 2010 (draft) Drainage
Policies and Standards Manual and the 2009 Methodology Manuals which can be downloaded for free from the
Flood Control District.
Additionally, projects which fall within a designated floodplain may require additional review and approval by the Flood Control
District of Maricopa County.
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