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 2021 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.

General provisions (Chapter 1)
Updated the chapter based on current practices. Note – the chapter was completely revised and no markups are shown.

Water main LUST interaction (Section 4C-1)
Modified to match Iowa DNR permit requirements for interaction of water mains and LUST sites.

Minimum street width alternative (Sections 5C-1 and 5C-2)
Updated Table 5C-1.01 by adding an additional 27 feet back-to-back street width and a 48 foot cul-de-sac radius alternative when agencies have larger fire apparatus.

Lane width and capacity (Section 5C-2, A)
Updated to reflect new lane width and capacity relationships.

Utility locating site restoration (Design Section 5I-3; Spec Sections 3020 and 7040)
Added information to address re-establishment of the pavement following cutting of core holes in pavements for utility location.

Driveway design for low volume residential streets (Sections 5L-3 and 5L-4)
Updated point of width measurement, established width based on number of garage stalls, clarified joint driveway width, and updated distance from intersections.

Page revised: May 29, 2020

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