Water Resources Management Plan

The Minnetonka Water Resources Management Plan (WRMP) was approved by the city council on August 3, 2009. The purpose of this WRMP is to provide proper management of surface and ground water by protecting, preserving and using natural surface and groundwater systems.

The WRMP is an excellent source of information for residents and developers when needing information on water bodies, wetlands or drainage patterns. The plan is based on goals the city council established for all of the city’s water resources and contains suggested capital improvements to achieve those goals.

Appendix A, “Stormwater Design Guidelines and Standards,” was prepared to assist developers, consultants and city staff in designing and managing water resource projects within the City of Minnetonka. This document outlines water resource related ordinances, required permits and approvals, and city design standards. In addition, there is detailed information related to stormwater volume credits and the design of various water quality treatment devices.

The documents linked below are all PDF files.

Introductory materials

Chapter I: Introduction

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  1. Location and History
  2. Regulatory History
  3. Need for the Plan
  4. Purpose and Scope
  5. General Approach to Planning
  6. Water Resources-Related Agreements
  7. Plan Organization

Chapter II: Goals and Policies

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  1. Water Quality
  2. Creeks
  3. Wetlands
  4. Education and Public Involvement
  5. Water Quantity and Flooding
  6. Groundwater
  7. Erosion and Sedimentation
  8. Funding

Chapter III: Physical Environment Inventory

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  1. Climate and Precipitation
  2. Topography
  3. Watersheds and Drainage Patterns
  4. Land Use
  5. Soils
  6. Geology/Groundwater Resource Data
  7. Public Waters
  8. Forest Resources and Native Vegetation
  9. Wetland Resources and Protection
  10. Water Quality
  11. Water Quantity/Flooding
  12. Creeks
  13. Surface Water System
  14. Recreational Areas
  15. Fisheries and Aquatic Habitat
  16. Unique Features and Scenic Areas
  17. Pollutant Sources


Table 3-1
Precipitation Summary–Minneapolis/St. Paul Airport Station
Table 3-2
Selected Precipitation and Runoff Events
Table 3-3
MCWD Identified Landlocked Areas in the City of Minnetonka
Table 3-4
DNR Public Waters within the City of Minnetonka
Table 3-5
Wetland Types (Circular 39) and Characteristics
Table 3-6a
Bassett Creek Watershed Wetland Inventory
Table 3-6b
Minnehaha Creek Watershed Wetland Inventory
Table 3-6c
Nine Mile Creek Watershed Wetland Inventory
Table 3-6d
Purgatory Creek Watershed Wetland Inventory
Table 3-7
Wetland Management Standards According to Relative Susceptibility and Management Potential
Table 3-8
Susceptibility of Wetlands to Degradation by Stormwater Impacts
Table 3-9
Water Quality Monitoring
Table 3-10
Minnetonka Monitored Water Bodies—Physical Characteristics and Water Quality Management Classifications and Goals
Table 3-11
Summary of WMOs Water Quality Classification Systems
Table 3-12
MPCA Ecoregion Eutrophication Criteria for Shallow and Deep Lakes
Table 3-13
Impaired Waters in the City of Minnetonka
Table 3-14a
Bassett Creek Watershed Data, Hydrologic Modeling, and Water Quality Modeling Summary
Table 3-14b
Minnehaha Creek Watershed Data, Hydrologic Modeling, and Water Quality Modeling Summary
Table 3-14c
Nine Mile Creek Watershed Data, Hydrologic Modeling, and Water Quality Modeling Summary
Table 3-14d
Purgatory Creek Watershed Data, Hydrologic Modeling, and Water Quality Modeling Summary
Table 3-15
Summary of Available Hydrologic and Hydraulic and Pollutant Loading Models Completed by WMOs
Table 3-16
City of Minnetonka Load Reductions as Required by MCWD
Table 3-17
Water Quantity Monitoring
Table 3-18
Summary of Rosgen Criteria for Physical Classification of Streams
Table 3-19
Minnehaha Creek Channel Stability Ratings
Table 3-20
NMCWD and RPBCWD Ecological Use Classification Criteria
Table 3-21
Fishery and Aquatic Invasive Species Information


Figure 3-1
Average Monthly High and Low Temperatures and Precipitation for Minneapolis-St. Paul International Airport (1970–2000)
Figure 3-2
Precipitation-Duration-Frequency Curves For the Minneapolis-St. Paul Area
Figure 3-3
Figure 3-4
Drainage Subdistricts, Subwatersheds and Drainage Patterns
Figure 3-5
Redevelopment Areas
Figure 3-6
Hydrologic Soil Groups
Figure 3-7
Groundwater Sensitivity to Pollution
Figure 3-8
Wellhead Protection Areas
Figure 3-9
Public Waters Inventory
Figure 3-10
Public Ditches
Figure 3-11
MCWD Key Conservation Areas
Figure 3-12
Wetland Management Classification
Figure 3-13
Summary of Wetland Management Classification by a) Number and b) Acres of Wetland
Figure 3-14
National Wetlands Inventory (NWI)
Figure 3-15
Water Quality and Quantity Monitoring
Figure 3-16
Locations 2003–2005 Water Quality Total Phosphorus
Figure 3-17
Impaired Waters
Figure 3-18
Water Quality Modeling (PondNet) Results Summary
Figure 3-19
100-Year Floodplain
Figure 3-20
Physical Stream Classification
Figure 3-21
Ecological Use Attainability (EUA) Classification
Figure 3-22
Recreation Areas and Public Access
Figure 3-23
Hazardous Waste Sites

Chapter IV: Watershed Plans

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  1. Bassett Creek
  2. Minnehaha Creek
  3. Nine Mile Creek Watershed
  4. Purgatory Creek


Table 4-1
Summary of Drainage Subdistrict Characteristics

Chapter V: Assessment of Issues

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  1. General Issues Discussion
  2. Minnesota Pollution Control Agency (MPCA) Issues
  3. Metropolitan Council Issues
  4. Bassett Creek Watershed Management Commission (BCWMC) Issues
  5. Minnehaha Creek Watershed District (MCWD) Issues
  6. Nine Mile Creek Watershed District (NMCWD) Issues
  7. Riley Purgatory Bluff Creek Watershed District (RPBCWD) Issues
  8. City of Minnetonka Issues
  9. Adequacy of Existing Programs


Table 5-1
MPCA Impaired Waters Listing Criteria
Table 5-2
Summary of the Impaired Waters List for Minnetonka
Table 5-3
MCWD Required Annual Phosphorus Load Reductions, City of Minnetonka
Table 5-4
NMCWD Goals and Issues for City of Minnetonka Lakes

Chapter VI: Implementation Program

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  1. Water Quality/NPDES Phase II MS4 Permit
  2. Operation and Maintenance of Stormwater Systems
  3. Specific MCWD Tasks
  4. Education and Public Involvement
  5. Cost Estimation
  6. Funding of Implementation Program
  7. Design Standards
  8. Ordinance Implementation and Official Controls
  9. Implementation Priorities
  10. Plan Update and Amendment Procedures
  11. Regulatory Framework and Agency Responsibilities
  12. Opportunities


Table 6-1
WRMP Completion Timeline Compared to WMO Timelines
Table 6-2
Storm Drainage System Unit Costs
Table 6-3
Potential Implementation Activities (including Capital Improvements) and Planning Level Cost Estimates
Table 6-4
Implementation Activity Timelines and Corresponding Yearly Costs in Dollars

Chapter VII: References

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Appendix A
Design Guidelines and Standards
Appendix B
City of Minnetonka SWPPP
Appendix C
City of Minnetonka Nondegradation Report
Appendix D
Source Water Assessment and Wellhead Protection Plan for Minnetonka
Appendix E
City of Minnetonka Wetland Protection Ordinance
Appendix F
City of Minnetonka Shoreland District Ordinance
Appendix G
City of Minnetonka Floodplain District Ordinance
Appendix H
City of Minnetonka Emergency Management Basic Plan—Public Version
Appendix I
Hydrologic/Hydraulic Models
Appendix J
City of Minnetonka Stormwater Funding Policies
Appendix K
WMO Rules
Appendix L
MCWD Loading Reduction Report
Appendix M
Water Resource Related Agreements