Review Guidelines for Proposed Projects

This section provides an introduction to the various tools available for proposed projects and orients a project applicant to the review process and requirements.

Projects that disturb one or more acres require the District’s review. Please contact John Loomis (651) 714-3714 or jloomis@ci.woodbury.mn.us.

Tools

Model Data Structure [PDF]

SWWD Permit Application [PDF]

Standards Manual [PDF]

Atlas 14 [PDF]

Minnesota Stormwater Manual

NPDES Permit

The Standards Manual is an outgrowth of the 2007 WMP. The Standards manual is also the foundation of the Developers Packet, providing further detail and elaboration beyond that which is abridged in the Packet. There are two primary purposes of the Standards Manual:

  • Address and establish consistency in water quality and quantity modeling approaches; and
  • Provide guidance on means and methods for achieving watershed standards.

This Manual should be used by those individuals seeking further clarity regarding mechanics of evaluating standards set forth in the WMP or needing guidance on appropriate tools and modeling parameters to achieve consistency in watershed analyses.

To most effectively use this Manual, individuals should identify their primary issue and then find the chapter relevant to that issue. This Manual is intended to provide a series of chapters dedicated to particular topics.

Requirements

SWWD Rules

SWWD Rules [PDF]

Under the Minnesota Watershed Law, MN State Statute 103D, the South Washington Watershed District (SWWD) exercises a series of powers to accomplish its statutory purpose. These Rules are adopted to implement those purposes for which the SWWD was formed. Purposes include carrying out the policies contained in the Watershed Management Plan (“the Plan”), coordinating SWWD activities with other governmental agencies, ensuring that water and natural resources are considered, protected, and preserved within the District, ensuring that future regional water management needs are considered in the development of individual subdivisions, developments, and local water management plans (LWMP), and to protect the public health, safety, and welfare.

WMP Standards

WMP Standards [PDF]

(Chp. 6): The philosophy underlying the approach to the District standards is focused on addressing variability within the watershed. The philosophy generally ensures that projects are not required to do more than their “fair share” to address water resource issues.

Project Location Map

Project proponents will need to identify the key downstream feature(s) which will influence the SWWD application of standards. The Project Location Map can be used to assist in determining whether a project will route stormwater to a wetland or the Mississippi River, or if a project is within a lake having an established maximum allowable total phosphorus load. The map will also illustrate the most proximate downstream regional assessment location which may be used to assess cumulative impacts from the watershed development activities.

Recommended Approach for Assessing Site Requirements

Download Figure 2.1 [PDF] to review a conceptual process for using the Project Location Map.

Click on an index sheet on the map below to view more detail….

Interactive Map

Navigate the South Washington Watershed District Interactive Map.

South Washington Watershed District Interactive Map

Technical Data

Once a project applicant is familiar with the review process and requirements, this section provides access to technical data used in the project review process.

GIS Data

Resources, and the required stormwater control requirements, vary across the watershed. Standards included in the SWWD 2007 WMP rely strongly on the use of maps to reflect the varying nature of resources across the watershed. It is intended that project proponents will evaluate the different resources affected by their proposed project, and understand the requirements associated with each resource at that location.All requirements must be met but the project proponent is responsible to determine and design for which requirement is most limiting to their site design. The variability across the watershed means that the volume control requirement may be most limiting at one site while the nutrient load requirement may be most limiting at another site.Access to relevant GIS shapefiles, GRIDs and metadata are provided below.

Map 6.1 Wetlands and designated classifications (Metadata | ESRI Shapefile)
Map 6.2 Estimated annual infiltration rates (inches) for typical climatic conditions (Metadata | ESRI Shapefile)
Map 6.3 Regional assessment locations (Metadata | Map6-3_shapefile)
Map 6.4 On-site infiltration potential (Metadata | ESRI Shapefile)
Map 6.5 Regional infiltration potential (Metadata | map6-5_grid)

For more information, please review Chapter 3 of the Standards Manual, “Use of Standards Maps to Evaluate Site Requirements.”

Computational Spreadsheets

Three electronic worksheet forms have been developed to provide a uniform method for assessing and reporting the water quality impacts of a proposed development project. All cells shaded in light blue require data entry by the user. Information for all other cells is automatically calculated.The first form to use is a Summary Worksheet for assessing the level of nutrient and volume control requirements for a proposed project. The summary worksheet allows a project agent to understand how much nutrient and runoff volume control is required based on the downstream water body receiving discharge from the project.A second form is a site Design Worksheet for reporting the BMPs used to achieve the required load and volume reductions. It allows the project agent to see the numeric endpoints required for their site, as determined from the first worksheet. The project agent can quantitatively assess their progress towards meeting the established standards based on the incorporation of site design elements. This second form must be submitted by the project agent to the District.

To download the Summary and Design Worksheet template file, click here (MS Excel format).

Third, a worksheet has been developed to assist in assessing the water quality benefits of potential non-structural BMPs. This worksheet aids in determining adjustments to water quality model input parameters when incorporating non-structural BMPs. Refer to Section 5.4.2 of the Standards Manual for more information.

Third, a worksheet has been developed to assist in assessing the water quality benefits of potential non-structural BMPs. This worksheet aids in determining adjustments to water quality model input parameters when incorporating non-structural BMPs. Refer to Section 5.4.2 of the Standards Manual for more information.

To download the Non-structural BMP Worksheet template file, click here (MS Excel format).

This template file contains four tabs for potential use:

  1. Determining Reduced Impervious Percentage from Soil Decompaction
  2. Determining Inputs to P8 Model with Soil Decompaction
    (note: all data is automatically calculated from first tab)
  3. Determining Inputs to P8 Model with Reduction in Connected Impervious Area
  4. Determining Inputs to P8 Model with Soil Decompaction and Reduction in Directly Connected Impervious Area in Tandem
    (note: soil decompaction data is automatically calculated from first tab)