Dane County Erosion Control and Stormwater Management Ordinance

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Dane County Erosion Control and Stormwater
Management Ordinance

• Jeremy Balousek, P.E.
• Dane County Land Conservation Department
• Madison, Wisconsin

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Landuse in the Lake Mendota Watershed
Agriculture 57
Transitional Areas 0.3
Open Water 7
Wetlands 6
Woodland 10
Existing Urban 20
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Sediment Delivered to Lake Mendota
Agriculture Woodland 58
Existing Urban 11
Streambank 8
Transitional 23
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Ordinance Content
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Construction site erosion control - 7.5
tons/acre/year for all sites
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Advantages of Soil Loss Standard

• Able to target areas for more effective control.
• Gives credit for exposure time and phasing.
• USLE Aids in the design of practices.
• Spreadsheet increases efficiency.

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Stormwater Components

• 20,000 sq. ft. cumulative impervious surface
  requires permit and plan.
• 4000 sq. ft. disturbance on redevelopment
  requires permit.
• flexibility for developers in meeting standards.

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Water Runoff Rate

• No increase in peak discharge rate for 2- year
  10-year storm events.
• Safely pass the 100-year storm event.
• Delivery off-site must be to a non-erosive,
  stable outlet.

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Hydrology Calculations

• Maximum runoff curve number of 68 for
  agricultural land.
• Must account for soil compaction by decreasing
  permeability class.

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Stable Outlet
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Infiltration
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Sediment Requirements

• new development -- 80 reduction
• 5 micron particle
• redevelopment -- 40 reduction
• 20 micron particle

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Agricultural Expansions

• dairy livestock expansions
• new indoor horse riding facilities
• other uses adding 20,000 ft sq impervious

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Oil and Grease Control
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Thermal Control
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Thermal Locator
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Catchment Basin in Sun Prairie
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Administration

• Effective county-wide, including all cities and
  villages
• As-built certification/Letter of credit.
• Maintenance plan recorded on deed.

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Enforcement

• May issue citation or stop-work-order immediately
• County may seek enforcement within a city or
  village
• On a site by site basis
• Against the city or villages program

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Dane County Erosion Control and Stormwater
Management Manual
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Web Resources

• http//www.co.dane.wi.us/landconservation/ecswpg.h
  tm
• Ordinance
• USLE Spreadsheet
• Thermal Locator
• EC and SW Manual
• Permit Applications