Maricopa County / Flood Control District of Maricopa County

Drainage Policies and Standards Manual for Maricopa County

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County policies/standards; technical hydrology in companion DDM volumes. Pipeline excerpt repair removed 1 unlocated citation(s).

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software, design_criteria.water_quality_volume_method

Other manuals in Arizona: Arizona Department of Transportation (ADOT), City of Chandler, City of Flagstaff, City of Mesa, City of Phoenix, City of Scottsdale, City of Tucson, City of Yuma, Pima County, Town of Prescott Valley

Document Metadata

Jurisdiction level

County

“Maricopa County”
Title

State

Arizona

“Arizona / ADWR State Standard 8-99”
References

Version / edition

Revised August 22, 2018 (document center label Nov 2025)

“Revised August 22, 2018”
Header

Adoption / effective date

2018-08-22

“Revised August 22, 2018”
Header

Last revised date

2018-08-22

“Revised August 22, 2018”
Header

Relationship to state manual

independent

“Drainage Design Manual for Maricopa County (DDM)”
Introduction

Design Criteria

Design storm return periods (years)

100-year

“100-year, 2-hour duration storm”
Standard 6.10.2

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

100-year floodplain / base flood elevation definition, Design storm duration criteria (Table 6.2; 6- and 24-hour storms), Retention basin percolation design factors (Tables 6.14–6.16), Detention basin alternative standards (Standard 6.10.4)

“shall make provisions to retain the stormwater runoff from a 100-year, 2-hour duration storm”
Standard 6.10.2

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Retention basins, Detention basins, First flush / green infrastructure, Stormwater storage facilities

“Retention basins / Detention Basin Requirements”
Standards 6.10.x