Supplemental Design

General Supplemental Design Standards

The following items have been approved by the SUDAS Board of Directors and are available for use. These items will be included in the 2023 Edition of the SUDAS Design Manual in December. Click on the topic title for the marked up version of the revision; click on the section reference for a clean version of the section that incorporates the change.

Errata and format revisions
Minor errors and formatting revisions.

Street flow criteria (Section 2A-3, Table 2A-3.01 and Table 2A-3.02)
Added roundabouts to the street classifications related to allowable spread of stormwater.

Storm and sanitary manhole drop (Sections 2C-3, G, 6 and 3C-1, L, 5)
Added preferred manhole drop of 0.3 feet and maintained minimum of 0.10 feet.

Separation of water mains from sewer mains (Sections 2D-1, F; 3C-1, G; and 4C-1, G)
Updated water and sewer separation language based on new Iowa DNR rules.

Page revised: June 7, 2022

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