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Minimal Impact Design Standards (MIDS): Enhancing stormwater management in Minnesota

The work of the Minimal Impact Design Standards (MIDS) workgroup was completed in June 2013. All MIDS materials are being migrated into the Minnesota Stormwater Manual

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Examples of low impact development.

Stormwater management has evolved substantially during the past 20 years. Historically, the goal was to move water off the landscape quickly and reduce flooding concerns. Now we are focusing on keeping the raindrop where it falls and mimicking natural hydrology in order to minimize the amount of pollution reaching our lakes, rivers and streams, and to recharge our ground waters. In order to successfully do so, standards are needed to create consistency in design and performance.

In response to this need, and advanced by a diverse group of partners, the Minnesota Legislature allocated funds to “develop performance standards, design standards or other tools to enable and promote the implementation of low impact development and other stormwater management techniques.” (Minnesota Statutes 2009, section 115.03, subdivision 5c).

Minimal Impact Design Standards (MIDS) represents the next generation of stormwater management and contains three main elements that address current challenges:

  • A higher clean water performance goal for new development and redevelopment that will provide enhanced protection for Minnesota’s water resources.
  • New modeling methods and credit calculations that will standardize the use of a range of “innovative” structural and nonstructural stormwater techniques.
  • A credits system and ordinance package that will allow for increased flexibility and a streamlined approach to regulatory programs for developers and communities.

The development of Minimal Impact Design Standards is based on low impact development (LID) — an approach to storm water management that mimics a site’s natural hydrology as the landscape is developed. Using the low impact development approach, storm water is managed on site and the rate and volume of predevelopment storm water reaching receiving waters is unchanged. The calculation of predevelopment hydrology is based on native soil and vegetation. (Minnesota Statutes 2009, section 115.03, subdivision 5c).

Performance goal for new development

In April 2011,  MIDS work group members agreed on a performance goal for new development:   For new, nonlinear developments that create more than one acre of new impervious surface on sites without restrictions, stormwater runoff volumes will be controlled and the post-construction runoff volume shall be retained on site for 1.1 inches of runoff from impervious surfaces statewide. 

Performance goal for redevelopment and linear

In June, 2013, the MIDS work group members agreed on a performance goal for redevelopment and linear.

Nonlinear redevelopment projects on site without restrictions that create one or more acres of new and/or fully reconstructed impervious surfaces shall capture and retain on site 1.1 inches of runoff from the new and/or fully reconstructed impervious surfaces.

Linear projects on sites without restrictions that create one acre or greater of new and/or fully reconstructed impervious surfaces, shall capture and retain the larger of the following:

  • 0.55 inches of runoff from the new and fully reconstructed impervious surfaces
  • 1.1 inches of runoff from the net increase in impervious area

Mill and overlay and other resurfacing activities are not considered fully reconstructed.

All projects shall first attempt to meet the volume reduction Performance Goal on site.  However, if an applicant is unable to achieve the full Performance Goal due to site restrictions as attested by the local authority and documented by the applicant, the Flexible Treatment Options Approach shall be followed in the sequence below and through the MIDS Design Sequence Flow Chart.

Stakeholder input and meetings

In October 2009, we collected input from developers, municipal planners, public works departments, and decision makers to prioritize the most important structural and nonstructural best management practices that are needed for stormwater management. We will be relying upon this list of practices to develop work plans for consulting services.

Stakeholder meetings were held October 7, 13, 19 and 29, 2009, in Brainerd, Duluth, Rochester and Plymouth.

 

MIDS Work Group

MIDS work group members, November 2011

MIDS work group

In January 2010, a workgroup was formed under the auspices of the Minnesota Stormwater Steering Committee.  Members of the MIDS workgroup will provide guidance and recommendations to the MPCA on the MIDs project. Co-chairs of the workgroup are Jay Riggs, Washington Conservation District and Jim Hafner, City of Blaine.  Meeting notes and a list of workgroup members are noted below.

Work group presentations

Memorandums

MIDS 319 pilot project in the St. Croix basin

The St. Croix MIDS Pilot Community Project was established to help St. Croix Basin communities meet state water quality regulatory requirements and provide a real testing ground for the application of the new MIDS performance goals, credits and calculators, and the community assistance package. The Pilot Community Project involves regional and focused community assistance in the form of education, training, review and consultation services, and tools and resources such as model ordinances; all with the intent to apply the MIDS package. Education and training includes NEMO – Nonpoint source Education for Municipal Officials programming and Stormwater U – technical training for staff and consultants. Up to three pilot communities will receive free education, training, and consulting services to update plans, ordinances and codes to protect their local water resources and ultimately the St. Croix River. The MIDS Pilot Community Project is funded by a Federal 319 Grant and managed through the Washington Conservation District with input from a Steering Committee.

For more information, please contact Jay Riggs at the Washington Conservation District:  651-275-1136  Ext. 20 or Anne Gelbmann, MPCA: 651-757-2384.

Resources and associated studies

  • PDF Document Minimal Impact Design Standards Partnership (lrp-gen-9sy11) Legislative Report (2011)
    • HTML Content Stormwater Reuse Guide (Metropolitan Council) External Link
      This publication introduces effective alternative techniques for stormwater reuse for the purpose of reducing demand on supplies of potable water in the Twin Cities metropolitan area. Tailored for city planners, engineers, and green thinkers, the guide provides step-by-step instructions for bringing a stormwater reuse project from concept through assessment to implementation. [Metropolitan Council, 2011; ZIP archive (7.3Mb) includes publication and supporting documents]

Related links

Clean Water Land and Legacy Amendment

Contact

For more information about the MIDS project, contact Anne Gelbmann at 651-757-2384.

Last modified on July 22, 2014 12:23