Water Resources Management Plan (WRMP) and Wetland Protection and Management Plan (WPMP)2017 UpdateRon Leaf, PE Ryan Peterson, PE Rebecca Nestingen, PE, CFM Daryl JacobsonSEH City of Burnsville

City of BurnsvilleCity Council Work Session, July 12, 2016

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Presentation Overview

• Reason for Plan Update• Key Sections / Topics to be Reviewed• Open House #1 and Initial Survey Results

– Aquatic vegetation• Next Steps / Schedule

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Reason for Plan Updates – Why now?

Minnesota Rules were updated in July of 2015 and now require that:• Must be revised once every ten years • Aligned with Comprehensive Plan schedule• Must adopt the plan between January 1, 2017 and December 31, 2018.

Previous Versions of the City’s Water Resources Management Plan:• Original Plan – The Drainage Plan For Burnsville, Minn. – 1966• First Local Water Plan – Comprehensive SWMP - 1994 • Second Generation Plan – Water Resources Management Plan – 2002

– Priority Issues: Water Quality and Water Quantity (Flooding)• Current Plan – Water Resources Management Plan – 2008

– Updates to Water Quality Goals and Development Design Standards

While the Wetland Plan does not follow the same state rule requirements, updating the Wetland Plan now provides some efficiencies in these related program areas.

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City-Wide H&H Model Update

EventProbability

RecurrenceInterval

TP‐40 Depth (Inches)

Atlas 14 Depth (Inches)

50% 2‐year 2.8 2.910% 5‐year 4.2 4.31% 100‐year 6.0 7.5

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Current Development/Design StandardsProject Size Applicability Volume Control Water Quality Rate Control Flood Control

Erosion and Sediment Control

• 0.5 acres or more of disturbed area

• 5,000 square feet or more of new impervious area

• 1 inch or runofffrom new impervious must be infiltrated

• 0.5 inches from redeveloped impervious must be infiltrated

• Met if meeting volume control 

• New development must remove 90% TSS and 60% TP

• Redevelopment must remove 70% TSS and 30% TP

• Proposed discharge rates must not exceed existing for the 2, 10, and 100‐year events

• Lowest ground level must be a min. of 2 ft. above the 100‐year HWL of nearby surface waters

• Grading permit required for 90 CY or more of disturbance

• Erosion control required for any land disturbing activity

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Wetland Standards

Wetland Classification

Permanent Buffer StripAverage Width (ft)

Minimum Permanent Buffer Zone Width 

(ft)

Percentage Native 

VegetationProtection 50 30 Entire

Improvement 35 25 EntireManagement 25 20 MajorityManagement II 20 20 Majority

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Lake Water Quality GoalsA Secchi disk is used to measure the transparency in bodies of water. The depth at which the disk is no longer visible is taken as a measure of the clarity of the water which is related to the water turbidity.

1. From MPCA’s 303(d) Impaired Waters List2. Earley Lake was previously listed as impaired but has been delisted.

Summer Average Depth (measured in Meters) Nutrient Impaired Lakes (1)Lake

2000 3‐Year Average

20153‐Year Average Goal

Alimagnet 0.9 0.8 1.3

Crystal 1.8 2.1 2.1

Earley 1.3 1.6 1.7 Note (2)

Keller 1.0 0.7 1.8

Lac Lavon 3.6 4.0 3.6

Sunset Pond 1.7 1.9 1.7

Twin Lakes 0.9 1.9 1.4

Wood Pond 1.4 1.7 1.7

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Initial Survey Results• Online survey format – 14 questions• Available at Open House #1 and will stay active through Open House #2• 24 Responses as of July 7, 2016• Generally by more informed residents• Full results will be posted on the project

web page

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Initial Survey Results

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%Top Priorities

1

T2 T2

** 2002 Plan Top Priorities

**

**

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Your biggest lake management concern?

Filamentous algae Watermilfoil

Coontail Curly‐leaf pondweed

Water Clarity

Shoreline Buffers

Nuisance Vegetation

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Initial Survey ResultsAquatic vegetation management dominated the Open House discussions and survey results related to concerns for lake quality and lake values

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Schedule

Open House #1 June 29City Council Workshop July 12PNRC Meeting July 18Draft Plan AugustOpen House #2 SeptemberPNRC Meeting SeptemberAgency Reviews October – NovemberAgency Approvals DecemberCouncil Adopts Plan January 2017

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Questions?

Water Resources Management Plan (WRMP) and Wetland Protection and Management Plan (WPMP)

2017 Update

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Initial Survey Results

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Current Program FundingFocused on:• Achieving the City’s Water Resources Goals• Meeting the requirements of the National Pollution Discharge Elimination System (NPDES)

municipal separate storm sewer system (MS4) permit program

Annual Revenue $4.8 MAnnual ExpendituresStaffing $0.8 MMaintenance and Equipment $0.9 MDebt Service $0.5 MCapital Projects $2.6 M

Staffing17%

Maintenance and Equipment

19%

Debt Service10%

Capital Projects54%

Annual Expenditures ‐ $4.8 M

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Initial Survey Results