Dane County Stormwater Manual

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erosion_control_and_stormwater_management_ordinance [2022/05/03 15:07] – adminerosion_control_and_stormwater_management_ordinance [2024/12/16 15:13] (current) – admin
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 ====== Erosion Control and Stormwater Management Ordinance ====== ====== Erosion Control and Stormwater Management Ordinance ======
-=====Ordinance Background=====+=====Background=====
  
-The {{https://www.countyofdane.com/documents/pdf/ordinances/ch014.pdf|Erosion Control and Stormwater Management Ordinance}} was designed to help protect Dane County’s lakes, streams, wetlands and quality of life by reducing the negative impacts of sediment, rainfall, melting snow and other water runoff. +The {{https://www.danecounty.gov/documents/pdf/ordinances/ch014.pdf|Erosion Control and Stormwater Management Ordinance}} was designed to help protect Dane County’s lakes, streams, wetlands and quality of life by reducing the negative impacts of sediment, rainfall, melting snow and other water runoff. 
  
 The ordinance establishes countywide standards for the quantity and quality of water that runs off land under construction in urban and rural areas, including farms.  It also provides flexibility in meeting those standards, recognizing the unique characteristics of each project and site.  The Erosion Control and Stormwater Management Ordinance builds on the construction site erosion control requirements that have been in effect since 1995. The ordinance establishes countywide standards for the quantity and quality of water that runs off land under construction in urban and rural areas, including farms.  It also provides flexibility in meeting those standards, recognizing the unique characteristics of each project and site.  The Erosion Control and Stormwater Management Ordinance builds on the construction site erosion control requirements that have been in effect since 1995.
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 Effective January of 2006, revisions to the erosion control and stormwater management ordinance were made to meet state standards for infiltration and to make shoreland erosion control requirements of Chapter 11 consistent with Chapter 14.  Dane County chose to adopt the state’s infiltration standards, with few modifications.  One significant change was a sunset date for the caps that limited that amount of area required to be dedicated to infiltration (State rules require only one percent of a residential site and two percent of a nonresidential site to be dedicated to infiltration).  The other significant change was the elimination of the design storm approach (utilizing TR-55) to meet the infiltration requirements.  The Dane County Lakes and Watershed Commission also assembled an infiltration taskforce to explore regulatory alternatives to caps and evaluate stormwater infiltration in Dane County.  The taskforce included members from the academic, development, municipal, regulatory communities, and watershed groups.  After nearly a year of work, the taskforce returned to the Dane County Lakes and Watershed Commission with a full report including a unanimous recommendation to remove the caps and include an alternative recharge performance standard.  The revised infiltration requirements were adopted in August of 2006, and are now effective. Effective January of 2006, revisions to the erosion control and stormwater management ordinance were made to meet state standards for infiltration and to make shoreland erosion control requirements of Chapter 11 consistent with Chapter 14.  Dane County chose to adopt the state’s infiltration standards, with few modifications.  One significant change was a sunset date for the caps that limited that amount of area required to be dedicated to infiltration (State rules require only one percent of a residential site and two percent of a nonresidential site to be dedicated to infiltration).  The other significant change was the elimination of the design storm approach (utilizing TR-55) to meet the infiltration requirements.  The Dane County Lakes and Watershed Commission also assembled an infiltration taskforce to explore regulatory alternatives to caps and evaluate stormwater infiltration in Dane County.  The taskforce included members from the academic, development, municipal, regulatory communities, and watershed groups.  After nearly a year of work, the taskforce returned to the Dane County Lakes and Watershed Commission with a full report including a unanimous recommendation to remove the caps and include an alternative recharge performance standard.  The revised infiltration requirements were adopted in August of 2006, and are now effective.
  
-=====Ordinance Applicability and Administration=====+=====Applicability and Administration=====
  
-Construction site erosion control plans and permits are required for any of the following: +For information on permit applicability, fees and review process, please see the [[permit information]] page.
-  *Land disturbance more than 4000 square feet. +
-  *Land disturbance involving excavation and/or filling more than 400 cubic yards of material. +
-  *Land disturbance of more than 100 lineal feet of road ditch, grass waterway, or other area where surface drainage flows in defined, open channels. +
-  *New public or private roads or access drives longer than 125 feet. +
-  *Development that requires a subdivision plat. +
-  *Land disturbance less than 4000 square feet that has a high risk of soil erosion or water pollution, as determined by local ordinance administration. +
-  *Land disturbance of any size in the shoreland zone, which includes any of the following areas: +
-    *Within 300 feet of the ordinary high-water mark of any navigable water. +
-    *Within the 100 year floodplain. +
-    *Within 75 feet of the shoreland or inland wetland district. +
- +
-Stormwater management plans and permits are required for any of the following: +
-  *Development that results in the cumulative addition of 20,000 square feet of impervious surface to the site (since August, 2001). +
-  *Construction of agricultural buildings where the new total impervious surface area exceeds 20,000 square feet. +
-  *Development requiring a subdivision plat. +
-  *Commercial or industrial development that requires a certified survey map. +
-  *Redevelopment exceeding 4,000 square feet of land disturbance where the site is predominantly developed to commercial, industrial, institutional or multifamily residential uses. +
-  *Other development or redevelopment that may have significant downstream impacts as determined by the local approval authority (In unincorporated areas, this is the Dane County Land and Water Resources Department (LWRD) Director). +
- +
-:?: Site is defined in the ordinance as the bounded area described in the erosion control plan or stormwater management plan  +
- +
-:!: Some land disturbing activities may be exempt from county and state erosion control requirements.  Certain state building projects and highway projects are subject to [[https://docs.legis.wisconsin.gov/code/admin_code/trans/401.pdf|Wisconsin Administration Code Chapter Trans 401]].  Refer to Dane County Chapters [[https://danedocs.countyofdane.com/webdocs/pdf/ordinances/ord011.pdf#page=8|11.05(2)]] and [[https://danedocs.countyofdane.com/webdocs/pdf/ordinances/ord014.pdf#page=14|14.47]] for a complete exemption list.+
  
 ====Preliminary Review Letter==== ====Preliminary Review Letter====
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 ====References==== ====References====
-  *{{https://www.countyofdane.com/documents/pdf/ordinances/ord011.pdf|Dane County Chapter 11 - Shoreland, Shoreland-Wetland And Inland-Wetland Regulations}} +  *{{https://www.danecounty.gov/documents/pdf/ordinances/ord011.pdf|Dane County Chapter 11 - Shoreland, Shoreland-Wetland And Inland-Wetland Regulations}} 
-  *{{https://www.countyofdane.com/documents/pdf/ordinances/ch014.pdf|Dane County Chapter 14 - Erosion Control And Stormwater Management}}+  *{{https://www.danecounty.gov/documents/pdf/ordinances/ch014.pdf|Dane County Chapter 14 - Erosion Control And Stormwater Management}}
  
erosion_control_and_stormwater_management_ordinance.1651604876.txt.gz · Last modified: by admin
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