Rainfall Event Classifications

Most communities in Iowa adequately manage the Qp and Qf level storms. In order to improve Iowa’s water quality and provide additional protection from flooding, further management of WQv and CPv classes is needed.

Unified Sizing Criteria

When planning and designing for post construction stormwater management, consideration should be given to both water quality and water quantity (flood control). The Unified Sizing Criteria in the Iowa Stormwater Management Manual (ISWMM) provides a comprehensive approach to managing stormwater, from the more frequent and smaller rainfall events, to the less frequent flooding events. Design specifications for all storm events can be found in the ISWMM posted on the Iowa DNR website.

Polk Soil and Water Conservation District

1513 North Ankeny Blvd., Suite 3

Ankeny, IA, 50023

(515) 964 1883 ext. 3

Monday – Friday

7:30 am – 4:00 pm

Polk Soil and Water Conservation District is an Equal Opportunity Employer.

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