City of Yuma
Drainage Policies and Standards Manual for Maricopa County (adopted by Yuma SWMP)
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Compare each cited field to the official PDF before relying on it. What this means
Yuma explicitly adopts Maricopa ECDDM/Drainage Policies; local retention rates in City Code Ch.192.
Document Metadata
Jurisdiction level
City
No evidence cited
State
Arizona
No evidence cited
Version / edition
revised 11/2025
No evidence cited
Adoption / effective date
Not found in document
No evidence cited
Last revised date
2025-11
No evidence cited
Relationship to state manual
adopts state manual directly
No evidence cited
Design Criteria
Design storm return periods (years)
2-year, 10-year, 50-year, 100-year
No evidence cited
Water quality volume method
Yuma SWMP/code adopt Maricopa County Erosion Control Drainage Design Manual and Drainage Policies as technical guidance. Maricopa Policy 3.6.6 First Flush: retain or treat the first 0.5 inches of direct runoff; Standard 6.10.2: new developments retain stormwater from a 100-year, 2-hour duration storm. City Code §192-04 retention also references 100-year 2-hour (1.22 in/hr) for residential basins.
“First Flush: retain or treat the first 0.5 inches of direct runoff”
Maricopa Drainage Policies 3.6.6
Peak flow calculation method(s)
Local 2-year, 24-hour storm peak control (Yuma §195-09), 100-year 2-hour retention volume (Maricopa / Yuma §192-04), 10-year 2-hour street conveyance
No evidence cited
Hydrologic/hydraulic software
Not found in document
No evidence cited
Approved BMP categories
Retention basins, Infiltration / LID BMPs per Maricopa ECDDM, Detention / conveyance controls
No evidence cited