Proposed Stormwater Management Criteria Update

The City of Manhattan amended our Stormwater Design Criteria to adopt the new Stormwater Management Criteria, 2023 edition.

The new criteria were published October 10, 2023, and take effect on November 1, 2023. This new document replaces the previous technical design standards contained in the Stormwater Management Master Plan (SWMMP) that had been in place since 1994.

An amendment to the City’s Post-Construction Best Management Practices Manual has also been issued with the same effective dates.

Submittals based on these designs must use the new Design Submittals Workbooks.

In addition, the City is proposing to adopt updated Standard Drawings and Construction Specifications which, when finalized, would supersede those currently in effect. Work is continuing on these documents and they will be issued at a later date.

A public comment period was held in the fall of 2022. This comment period included two public meetings held on October 18, 2022.

A second public comment period was held from August 12, 2023, through September 7, 2023, and is now closed.  A presentation was given to the City Commission on the new standards at its work session held August 22, 2023.

Comments or questions regarding these standards should be sent to Bill Heatherman, Stormwater Compliance Engineer, by email or by phone at (785) 587-4578.

New Criteria and Standards, As Adopted to Date

The following documents have been formally adopted and are available from the Public Works Standard Specifications page:

Propose Criteria and Standards, Still Under Development

Supporting Materials