http://danecountystormwatermanual.com/ 2026-05-30T08:54:20+00:00 http://danecountystormwatermanual.com/ http://danecountystormwatermanual.com/lib/exe/fetch.php?media=wiki:logo.png text/html 2025-02-11T21:19:16+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=acceptable_native_species&rev=1739308756&do=diff Acceptable Native Species Per Dane County Ordinance Chapter 11.12(2)(b)2, the species used in a shoreland vegetative buffer shall include only species of vegetation native to South Central Wisconsin, ecologically adapted to the conditions of the site. text/html 2024-01-19T18:57:34+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=as_built_certification&rev=1705690654&do=diff As-Built Certification As‐built certification, prepared by a Professional Engineer, is required within 10 days following installation of all stormwater management practices to ensure that the site was developed in accordance with the approved plan. text/html 2022-05-24T19:07:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=basin_efficiency&rev=1653419246&do=diff Basin Efficiency Design Basins must be designed to meet applicable ordinance performance standards, such as peak rate control and sediment reduction. Basin design should also take into account the physical characteristics of the site and be designed in accordance with Dane County and WDNR technical standards. text/html 2025-09-30T18:49:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=bioretention_device&rev=1759258143&do=diff Bioretention Device :!: The current version of WinSLAMM (10.5.0) overestimates evapotranspiration (ET) volume. Until a fix is implemented, ET may not be turned on in the model. :!: Bioretention devices are infiltration devices used for the treatment and infiltration of stormwater runoff. A bioretention basin is made up of several layers, which treat stormwater as it is filtered. These basins remove pollutants and reduce runoff volume and temperature. Bioretention basins can be used as a sta… text/html 2023-11-21T20:27:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=buffer_strip&rev=1700598459&do=diff Buffer Strip Buffer strips are densely vegetated areas that collect and slow runoff, filtering out sediments and insoluble pollutants and encourage infiltration. Stormwater flows into a buffer strip over a level spreader, a device that converts concentrated flow into sheet flow. As the runoff flows through the vegetation, its velocity is reduced, releasing its load of suspended solids and promoting infiltration. text/html 2024-05-09T15:19:58+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=concrete_washout&rev=1715267998&do=diff Concrete Washout After cementitious materials, such as concrete, mortar, plaster, stucco, and grout, have been placed on a construction site, the equipment used must be washed out to remove the material before it hardens. This equipment can include the chutes of ready mixed concrete trucks and hoppers, equipment such as wheelbarrows and hand tools, or mobile cement mixers. text/html 2023-02-21T15:08:00+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=connected_impervious&rev=1676992080&do=diff Connected Impervious Connected impervious is defined in The Ordinance as an “impervious surface that is directly connected to a separate storm sewer or water of the state via an impervious or concentrated flow path”. Please note that grassed swales are considered concentrated flow paths. Generally, sheet flow conditions cannot be maintained more than 100 feet across any surface, including pervious, before becoming concentrated. text/html 2022-05-13T13:27:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=constructed_wetland&rev=1652448458&do=diff Constructed Wetland :!: Constructed wetlands are a conservation practice and may not be used to meet stormwater management performance standards. These artificial wetland systems are designed to collect and temporarily store runoff while reducing stormwater flow velocity and trapping pollutants. Pollutants, such as metals, nutrients, sediment, and organic substances, are removed by the settling of particulates, biological uptake, consumption, and decomposition. text/html 2022-05-11T15:33:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=construction_scheduling&rev=1652283231&do=diff Construction Scheduling Construction scheduling involves the coordination of three construction-planning activities: Site Phasing, Limiting Site Disturbance, and Construction Sequencing. Site phasing reduces erosion from a site by reducing the amount of soil exposed at any one time by staging construction activities. Limiting site disturbance preserves areas that are highly susceptible to erosion and maintains them as vegetated areas. Construction sequencing involves planning land disturbanc… text/html 2022-05-11T14:39:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=deep_tilling&rev=1652279980&do=diff Deep Tilling Deep tilling (or subsoiling) is a practice that rips the soil perpendicular to the direction of flow. This creates a cut in the soil that results in a series of horizontal ridges and depressions, which slows runoff and encourages infiltration and deposition, decreasing soil loss from a site. In addition, deep tilling relieves soil compaction and increases pore space, fostering plant growth by increasing nutrient availability and water retention. text/html 2023-11-21T20:26:18+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=dewatering&rev=1700598378&do=diff Dewatering Dewatering is a practice where sediment-laden water is pumped into a compartmented container, settling basin, filter, or other appropriate best management practice to trap and retain sediment. This practice detains sediment generated during the removal of water from a site prior to discharging it off-site and/or to waters of the state. text/html 2023-02-20T17:59:37+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=disconnected_impervious&rev=1676915977&do=diff Disconnected Impervious Disconnecting impervious surfaces is one of the most cost effective ways to reduce runoff rates, volumes and sediment. By routing runoff across pervious surfaces prior to being concentrated in swales or sewers, sediment can be trapped in the vegetation and water infiltrated into the soil. In order for some, or all, of a site's runoff to be considered disconnected, it must meet text/html 2025-02-14T15:47:02+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=dry_pond&rev=1739548022&do=diff Dry Pond A dry pond temporarily retains stormwater and gradually releases it to a conveyance structure (refer to Vegetated Swale, Lined Waterway or Outlet, or Subsurface Drain). Its purpose is to reduce stormwater peak flow rates and trap sediment particles. By trapping sediment, associated pollutants are also removed. Dry ponds are designed to drain completely within 48 hours of the storm event. text/html 2024-12-16T20:13:12+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=erosion_control_and_stormwater_management_ordinance&rev=1734379992&do=diff Erosion Control and Stormwater Management Ordinance Background The [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. text/html 2022-12-09T22:15:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=erosion_control_notes&rev=1670624115&do=diff Erosion Control Notes :!:Remove or strikeout notes that are not applicable to the site.:!: General Notes * Construct and maintain erosion control measures in accordance with Wisconsin DNR and Dane County requirements. * Install erosion control practices prior to initiating other land disturbing activities. text/html 2022-05-19T16:14:46+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=erosion_control&rev=1652976886&do=diff Erosion Control Erosion occurs when soil particles are detached from the land surface and carried down slope by moving water. Figure 1 illustrates how this process commonly occurs. First, a raindrop’s velocity increases as it approaches the soil surface. This velocity, plus the drop’s weight, provides sufficient energy at impact to detach soil particles. Once detached, upslope soil particles are carried by runoff until the flow spreads out, the gradient decreases and energy dissipates. As … text/html 2025-01-07T16:15:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=erosion_matting&rev=1736266548&do=diff Erosion Matting Erosion matting consists of a wide variety of organic or synthetic mats and blankets placed on the soil surface to reduce erosion from a site caused by concentrated runoff and raindrop impact. These devices are anchored to the exposed surface and help hold the soil in place by forcing runoff to pass through the matting, reducing its velocity and its ability to erode the exposed surface. text/html 2025-10-30T20:15:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=filter_strip&rev=1761855348&do=diff Filter Strip Filter strips are densely vegetated areas that collect and slow runoff, thereby filtering out sediments and infiltrating insoluble pollutants. Filter strips are typically used to treat runoff from impervious areas that generate significant pollutants, such as parking lots. They should be uniformly graded at shallow slopes to encourage sheet flow through their full flow length and are best used in conjunction with other management practices, as they do not significantly reduce peak … text/html 2022-05-16T19:15:19+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=filtration_device&rev=1652728519&do=diff Filtration Device A filtration device is a proprietary practice designed to remove oil, grease, sediments, trash, and other debris from stormwater by passing them through a media filter. They are most often used for commercial or industrial redevelopment applications where other management practices are not practical. In high flow situations, the volume of water may exceed the capacity of the filter chamber and stormwater may bypass the device without treatment. text/html 2025-05-20T18:07:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=financial_security_instrument&rev=1747764423&do=diff Financial Security Instrument Permit applications with an erosion control and stormwater management installation cost estimate greater than $10,000.00 must provide a Financial Security Instrument (FSI) prior to permit issuance. The FSI may be an irrevocable letter of credit (LOC) or certified check. Certified checks must be made out to text/html 2022-05-12T16:32:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=gabion&rev=1652373162&do=diff Gabion Gabions are rock-filled, multi-celled, PVC coated wire baskets that are typically placed in ponds as outlet structures. They absorb a great deal of the water’s energy by forcing water to pass through the voids in the structure, which reduces its velocity, promoting sedimentation and reducing channel erosion. text/html 2024-05-07T19:04:44+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=green_infrastructure&rev=1715108684&do=diff Green Infrastructure Green infrastructure is any stormwater practice that use plant or soil systems, permeable pavement or other permeable surfaces or substrates, stormwater harvest and reuse, or landscaping to store, infiltrate, or evapotranspirate stormwater and reduce flows to sewer systems or to surface waters. Practices that meet this requirement include, but are not limited to, the following: text/html 2024-02-08T20:33:53+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=green_roof&rev=1707424433&do=diff Green Roof Green roofs are a roofing systems with a layer of vegetation planted over the waterproofing system that is installed on top of a flat or slightly sloped roof. Water is stored by the roof's substrate and then taken up by the plants, returning to the atmosphere through evapotranspiration.$$ V_s=\frac{A_\text{roof} \cdot[(d_\text{media} \cdot 𝜂_1)+(d_\text{drainage} \cdot 𝜂_2)]}{12 \frac{in}{ft}} \quad , where: $$$$ V_s=\text{storage volume (cf)} $$$$ A_\text{roof}=\text{green roof area… text/html 2025-01-14T21:54:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=home&rev=1736891655&do=diff Dane County Stormwater Manual This manual is designed to help landowners, developers and designers meet the requirements of Dane County's erosion control and stormwater management ordinance and aid in the permit process. The manual includes information on why erosion control and stormwater management is needed, text/html 2025-09-30T18:48:54+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_basin&rev=1759258134&do=diff Infiltration Basin :!: The current version of WinSLAMM (10.5.0) overestimates evapotranspiration (ET) volume. Until a fix is implemented, ET may not be turned on in the model. :!: Infiltration basins are depressions that collect and store stormwater until it can infiltrate into the subsoil. Sediment settles out in the device, and nutrients, metals, and organic material are adsorbed by the soil as the water infiltrates. Infiltration basins may also be designed to reduce peak flows from a site… text/html 2025-11-06T21:03:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_exemptions&rev=1762463010&do=diff Infiltration Exemptions The following activities are exempt from the 90% infiltration standard: * Sites (or areas) that meet the definition of redevelopment * New development with less than 10% connected impervious and a cumulative impervious area less than one acre * Agricultural development related to the production of food and fiber text/html 2025-09-30T18:48:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_guidance&rev=1759258100&do=diff Infiltration Guidance This page is intended to provide guidance on infiltration design, modeling and construction, based on approved policy and frequently asked questions. :!: The current version of WinSLAMM (10.5.0) overestimates evapotranspiration (ET) volume. Until a fix is implemented, ET may not be turned on in the model. text/html 2025-09-30T18:48:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_modeling&rev=1759258120&do=diff Infiltration Modeling :!: The current version of WinSLAMM (10.5.0) overestimates evapotranspiration (ET) volume. Until a fix is implemented, ET may not be turned on in the model. :!: Regulatory Approach to Infiltration The Dane County infiltration standard is modeled after the Wisconsin Department of Natural Resources (DNR) standard. The standard is based upon requiring a percentage of precipitation infiltrated in the predevelopment condition (also known as predevelopment infiltration) to be… text/html 2022-05-16T19:16:53+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_practice_construction&rev=1652728613&do=diff Infiltration Practice Construction Construction of stormwater practices that rely on infiltration to properly function (e.g. bioretention, infiltration basins) require extra care and oversight. Improper construction will result in failures and costly rebuilds. Recommended techniques for construction and sequencing are provided below, which should be followed to help ensure proper function of these sensitive practices. text/html 2022-06-29T20:31:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_practices&rev=1656534695&do=diff Infiltration Practices Infiltrating stormwater runoff is a great way to reduce the amount of water and pollutants reaching our lakes and streams. There are three primary practices that may be used for infiltration, but which one should be used on your site? The table below summarizes design guidelines to help choose the appropriate practice. Once a practice is selected, more specific guidance and requirements can be found on their individual pages. text/html 2025-02-13T21:20:27+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=infiltration_trench&rev=1739481627&do=diff Infiltration Trench Infiltration trenches and beds are rock filled depressions that collect and store stormwater until it can infiltrate into the subsoil. Sediment settles out in the device, and stone and subsoil adsorb nutrients, metals, and organic material as the water infiltrates. Infiltration trenches and beds may also be designed to reduce peak flows from a site if the storage capacity of the device is increased and an outlet structure is included in the design. text/html 2023-11-21T20:29:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=inlet_protection&rev=1700598569&do=diff Inlet Protection Stormwater inlet protection devices are temporary practices designed to prevent suspended sediment from entering drainage systems such as culverts, catch basins, and storm sewers. These devices reduce the velocity of runoff by forcing it through a filtering device, temporarily ponding the water and encouraging suspended particles to settle out. Inlet protection is critical because it is often the last treatment measure that the stormwater receives before it enters receiving w… text/html 2022-05-13T14:37:58+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=lined_waterway_or_outlet&rev=1652452678&do=diff Lined Waterway or Outlet Lined waterways or outlets are channels lined with stone and provide for non-erosive conveyance of runoff or concentrated flow in areas where grassed waterways or unlined channels are inadequate or not permissible. These practices are applicable on sites where vegetation cannot be established due to shading; where a lining is required to control erosion; where high velocities, steep grades, seepage, prolonged base flow, or wetness would cause erosion; or where use by … text/html 2024-02-29T21:59:12+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=management_practices&rev=1709243952&do=diff Management Practices The following is a list of approved practices to help meet the erosion control and stormwater management requirements. The list is a representative sample of available practices. Alternative practices are encouraged and may be used as part of an erosion control or stormwater management plan if they meet the requirements of the site and are approved by the Land and Water Resources Department. No single practice is capable of meeting all the needs of an individual site, so pr… text/html 2024-02-29T21:59:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=minimizing_impervious_areas&rev=1709243970&do=diff Minimizing Impervious Area Minimizing impervious areas provides more areas for stormwater to infiltrate, reducing the amount of stormwater that leaves a site. In addition, less impervious area reduces the urban heat island effect and reduces construction and maintenance costs. text/html 2025-01-30T15:06:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=mulching&rev=1738249586&do=diff Mulching Mulching is the application of material to the soil surface to protect it from raindrop impact and overland flow. Mulch covers the soil and absorbs the erosive impact of rainfall and reduces the flow velocity of runoff, significantly reducing soil loss from a site. text/html 2025-08-14T15:42:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=native_plants&rev=1755186169&do=diff Native Vegetation Native vegetation refers to plant species that naturally occur and have evolved in a specific region or ecosystem over a long period of time. Plants native to an area are adapted to the local climate, soil conditions, and ecological processes of their native habitat. They play a crucial role in maintaining biodiversity, supporting wildlife habitat, and providing ecosystem services such as soil stabilization, water filtration, and carbon sequestration. In the context of stormwa… text/html 2023-06-15T18:29:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=oil_and_grease_control&rev=1686853760&do=diff Oil and Grease Control For development with greater than 40 parking stalls or where the potential for pollution by oil and/or grease exists, the first half inch of runoff must be treated using the best technology available. This requirement may be waived by the plan reviewer only when the applicant can demonstrate that installation of such practices is unnecessary. text/html 2022-05-13T19:49:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=orphans&rev=1652471382&do=diff text/html 2022-05-25T16:27:02+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=owners_guide_to_infiltration&rev=1653496022&do=diff Owner's Guide to Infiltration Infiltration practices, such as bioretention devices and infiltration basins, are a common requirement of stormwater management permits. These practices can vary in size and appearance, but they are all designed to trap and pond water while it slowly seeps into the soil. To prevent failure, infiltration practices require extra care while being constructed and continual maintenance. If an infiltration practice is located on your property, the recommendations below s… text/html 2022-05-13T14:47:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=permanent_diversion&rev=1652453258&do=diff Permanent Diversion A permanent diversion is a vegetated channel that is designed to intercept and collect runoff, diverting it down slope to an area that is less susceptible to erosion. Diversions are constructed upslope of areas where erosion is likely to occur and, by reducing runoff velocities, allow sediments and soluble pollutants to settle out. text/html 2025-02-13T21:06:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=permeable_pavement&rev=1739480802&do=diff Permeable Pavement Permeable pavement allows stormwater to percolate through small pores or gaps in the pavement. The purpose of these systems is to encourage infiltration by reducing the amount of runoff that is produced from a site. Runoff soaks through the voids in the pavement and into a basin that is filled with gravel, a layer of filter fabric, and a stone reservoir. These layers work together to both support the pavement above it and to speed percolation into the subsoil. text/html 2025-01-16T15:53:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=permit_information&rev=1737042809&do=diff Permit Information This page outlines the permits needed for many land disturbing activities and development as required under Dane County Chapters 11 and 14. Check with Water Resource Engineering Division (WRE) staff to determine if your project needs a permit before you begin. text/html 2023-11-21T20:31:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=polymer_and_other_additives&rev=1700598711&do=diff Polymer and Other Additives The land application of additives, such as polyacrylamide (PAM) and other polymers, can temporarily reduce erosion through the bonding of soil aggregates. The resulting soil surface is significantly more resistant to erosion than untreated soil. text/html 2025-04-24T18:39:50+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=prescriptive_compliance&rev=1745519990&do=diff Prescriptive Compliance Soil loss generated from gentle and moderate slopes subject to sheet and rill erosion can be determined using the Universal Soil Loss Equation (USLE) model. Steep slopes and areas of concentrated flows cannot be modeled using the USLE methodology, and instead, are subject to prescriptive compliance. text/html 2025-02-13T22:10:25+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=rain_garden&rev=1739484625&do=diff Rain Garden Rain gardens are shallow depressions that are designed to collect stormwater and promote infiltration, minimizing the amount of runoff from a site. These infiltration areas are planted with native vegetation, which act as a natural sieve, absorbs excess nutrients, and filters out pollutants. text/html 2025-12-02T15:35:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=recreational_trails&rev=1764689703&do=diff Stormwater Performance Standards for Recreational Trails Recreational trails provide opportunities to enjoy Dane County’s many scenic areas, however, their construction may impact water quality and be subject to county stormwater standards. Depending on characteristics of the trail and surrounding land area, there are stormwater treatment options that provide flexibility when planning work on a trail. The prescribed options discussed in this guidance will assist municipal or state trail designe… text/html 2022-05-19T20:33:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=redevelopment&rev=1652992381&do=diff Redevelopment Based on existing and proposed land cover, sites may need to meet redevelopment standards, new development standards, or a mixture of the two. A stormwater permit is required for the following activities: * The cumulative addition of 20,000 square feet of impervious surface. text/html 2023-11-21T20:32:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=sediment_basin&rev=1700598753&do=diff Sediment Basin A sediment basin is a temporary ponding area, designed to catch and remove sediment from runoff while controlling the rate stormwater is released. Stormwater enters the basin and is impounded behind an embankment structure, temporarily ponding the water and allowing suspended sediments to settle out. As the water level in the basin rises and reaches its design depth, the water is drained by a riser, which releases only the relatively sediment free upper portion of the water col… text/html 2024-02-29T21:59:46+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=sediment_trap&rev=1709243986&do=diff Sediment Trap A sediment trap is a small, temporary ponding area designed to catch and remove sediment from runoff. Runoff enters the trap and is impounded in a basin behind a stone weeper, reducing the velocity of the runoff and allowing suspended sediments to settle out. text/html 2023-11-21T20:33:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=seeding&rev=1700598832&do=diff Seeding Seeding is one of the most effective erosion control practices available. It stabilizes disturbed areas with vegetation, which protects the soil from raindrop impact, reduces flow velocities, increases infiltration, and reduces soil loss from the site. Seeding is economical and adaptable to most any area, improving aesthetics and reducing dust and mud problems that are common on many construction sites. Temporary seeding stabilizes disturbed areas with fast growing annual grasses, small… text/html 2025-01-27T20:56:59+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=sidebar&rev=1738011419&do=diff [Do I Need a Permit?] Application Forms * [Erosion Control (EC) and Shoreland Erosion Control (SE) Application] * [Simplified EC Application] * [Stormwater Management (SM) Application] * [Shoreland Mitigation (MG) Application] Application Materials * [Applicant Authorization Form] * [Stormwater Maintenance Agreement] ( [ ]) * Financial Security Instrument What's New? * Stormwater Resources * Infiltration Exemptions * Erosion Control Notes * Stormwater Maintenance * Green … text/html 2023-11-21T20:36:12+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=silt_fence&rev=1700598972&do=diff Silt Fence A silt fence is a temporary structure, constructed of woven geotextile fabric attached to posts, which minimizes the loss of sediment from a site and prevents sheet and rill erosion. These structures intercept runoff and force it to pass through the fabric, reducing its velocity and allowing suspended sediments to settle out upslope of the silt fence. text/html 2024-09-16T14:21:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=silt_sock&rev=1726496511&do=diff Silt Sock Silt sock is a temporary erosion control practice constructed by filling a fabric tube with permeable media. They are primarily used as perimeter control to minimize the loss of sediment from a site or stockpile, but can also be used as a slope break to reduce sheet and rill erosion. By intercepting runoff and forcing it to pass through (or over) the silt sock, the runoff's velocity is reduced, which allows suspended sediments to settle out. Silt sock should be installed prior to sit… text/html 2026-02-09T15:39:07+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=site_and_regional_planning&rev=1770651547&do=diff Site and Regional Planning Techniques to Minimize Stormwater Runoff Decisions about lot layout, building density, location of public rights-of-way, protection of sensitive areas, and preservation of open space all have an impact on the quality and quantity of stormwater runoff. Good stormwater management does not begin with site disturbance and construction. To encourage early consideration of these issues, the Dane County Erosion Control and Stormwater Management Ordinance includes a volunta… text/html 2023-08-23T14:37:56+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=site&rev=1692801476&do=diff Site The common term 'site' (lower case 's') is defined as “a place of activity” and is commonly used to describe a property or location of development or operations. The regulatory term 'Site' (capital 'S') is by definition [14.04(51)] “the bounded area described in an erosion control plan or stormwater management plan, including areas that are part of a larger common plan of development”. When the ordinance states a performance standard “is to be achieved on the Site”, this distinction beco… text/html 2022-05-11T14:47:06+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=slope_drain&rev=1652280426&do=diff Slope Drain A temporary slope drain is a flexible pipe that is designed to carry concentrated runoff from the top of a slope to the base of the slope without causing erosion. Runoff is intercepted upslope of a disturbed area and is routed to the slope drain, which carries the runoff to a stable outlet, where it is released at a non-erosive velocity into a sediment trap or basin. text/html 2022-05-13T20:58:18+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=sod&rev=1652475498&do=diff Sod Sod stabilizes disturbed areas with dense, permanent vegetative cover immediately after it is installed. Dense, established vegetation protects the soil from raindrop impact, reduces flow velocities, increases infiltration and reduces soil loss from the site and is the most effective immediate site stabilization practice available. text/html 2026-02-11T20:03:31+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=soil_loss_and_sediment_discharge&rev=1770840211&do=diff Soil Loss and Sediment Discharge Permittees can demonstrate compliance with the sediment discharge standard of 5.0 tons/ac/year in Chapter 14.11(3)(b) by using the Soil Loss & Sediment Discharge Calculation Tool. This Excel spreadsheet projects soil loss and sediment discharge from a site using the Universal Soil Loss Equation (USLE), based on the timing of land disturbance, restoration, and the implementation of erosion control BMPs. text/html 2023-11-21T20:37:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stone_check_dam&rev=1700599049&do=diff Stone Check Dam A stone check dam is a barrier constructed of stone that reduces the flow velocity of runoff, while minimizing channel erosion and promoting sediment deposition. Stormwater enters a swale or vegetated ditch and, under normal circumstances, is ponded temporarily behind the check dam in the sediment control basin. Ponding allows sediment and other pollutants to settle out, while allowing some water to infiltrate and evaporate. The water that remains is slowly passed through the… text/html 2025-09-16T14:51:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stone_crib&rev=1758034280&do=diff Stone Crib A stone crib is a designed basin that collects the first ½ inch of stormwater from a site and reduces its velocity by passing it through the basin. This action promotes sedimentation and reduces the temperature of runoff by utilizing the heat exchange capacity of the stone. As stormwater enters the stone crib, it is passed through a layer of pervious pavement block and pea gravel, which filter out sediment and other particles. It then mixes with the stone and any stored water in t… text/html 2025-09-30T19:18:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stone_outlet_protection&rev=1759259895&do=diff Stone Outlet Protection (Riprap) Stone outlet protection, or riprap, is designed to release water from management practices at non-erosive velocities. An apron of angular stone is placed at the outlet to prevent erosion by dissipating the energy of water as it flows over.$$ L=1.7*(\frac{Q}{{D_o}^\frac{3}{2}})+8D_o $$$$ W=3*D_o $$$$ T=D_{50}*2 $$ text/html 2023-11-21T20:39:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stone_tracking_pad&rev=1700599143&do=diff Stone Tracking Pad A stone tracking pad is designed to limit the amount of sediment that is transported from a site by vehicles. Stone tracking pads remove sediment from the tires of vehicles by allowing the tires to sink in to the stone base slightly. This action, combined with the rolling motion of the tires, acts to knock loose the majority of sediment from a vehicle’s tires. text/html 2023-11-21T20:39:53+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stone_weeper&rev=1700599193&do=diff Stone Weeper Stone weepers are outflow devices constructed of stone that reduce the flow velocity of runoff while minimizing channel erosion and promoting sediment deposition. Stormwater enters a swale or vegetated channel and, under normal circumstances, is ponded temporarily behind the weeper. Ponding allows sediment and other pollutants to settle out, while allowing some water to infiltrate and evaporate. The water that remains is slowly passed through the voids in the structure, continuin… text/html 2022-05-16T19:21:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stormwater_and_agriculture&rev=1652728880&do=diff Stormwater and Agriculture Stormwater is water that comes from precipitation in the form of rain, snow, or ice melt. Stormwater either infiltrates into the ground or turns into surface runoff that collects in lakes, ponds, rivers or streams. This runoff can carry with it various types of pollutants, so collecting and treating it before it reaches a natural water body is critical for protecting our natural resources and is an important part of stormwater management. A watershed, or any area of… text/html 2025-01-15T14:57:21+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stormwater_maintenance&rev=1736953041&do=diff Stormwater Maintenance Permanent stormwater practices (e.g. Wet Pond, Bioretention Device, Infiltration Basin) installed as part of a stormwater management permit are required to be maintained by the property owner. Maintenance is critical for the practices to operate as designed and to effectively treat runoff from the site. The pollutant removal, channel protection, and flood control capabilities of all practices will decrease if regular inspection and necessary maintenance is not performed. text/html 2024-02-29T21:52:53+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stormwater_management&rev=1709243573&do=diff Stormwater Management The Hydrologic Cycle The hydrologic cycle, illustrated in Figure 1, is the movement of water from the atmosphere to the earth’s surface. Water moves through one or more components of the cycle including evaporation, transpiration, runoff, precipitation, infiltration, percolation and its eventual return to the atmosphere. text/html 2026-04-28T20:34:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=stormwater_resources&rev=1777408473&do=diff Stormwater Resources These stormwater flyers were developed to assist property owners and individuals responsible for maintenance of stormwater management practices. * [ Stormwater 101 Flyer] Guidance Documents * [ Inspecting Stormwater Management Practices] * [ Vegetation Management Flyer] BMP Specific Documents * [ Bioretention Basins] * [ Filter Strips] * [ Infiltration Basins] * text/html 2024-02-29T21:59:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=street_sweeping&rev=1709243997&do=diff Street Sweeping Street sweeping prevents sediment, heavy metals, and other pollutants from reaching receiving waters by removing them from impervious areas before they reach storm drains. Impervious areas accumulate sediment, lawn and leaf trimmings, trash, and other debris, along with heavy metals and other pollutants. As stormwater flows over these surfaces, these substances are carried along with it, polluting waterways and increasing the sediment load of the water body. text/html 2022-05-13T20:55:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=subsurface_drain&rev=1652475301&do=diff Subsurface Drain Subsurface drains (or underdrains) are tiles, pipes, or tubes installed below ground that collect and transport stormwater to an outlet. They are constructed from a variety of materials, including plastic, clay, and concrete and may be perforated to allow infiltration into the surrounding soil. They are used in areas with high water tables, poorly drained soils, or on slopes to prevent saturation and to remove the possibility of subsidence. They may also be used in areas whe… text/html 2022-05-13T15:50:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=surface_roughening&rev=1652457042&do=diff Surface Roughening Surface roughening is a practice that abrades the soil surface with horizontal ridges and depressions across the slope, decreasing erosion by reducing runoff velocities. In addition, this practice also increases infiltration and fosters the establishment of vegetation. text/html 2023-11-21T20:40:36+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=temporary_diversion&rev=1700599236&do=diff Temporary Diversion A temporary diversion is a channel constructed across a slope that is designed to intercept and collect stormwater, diverting it down slope to an area that is less susceptible to erosion. Temporary diversions reduce runoff velocities, allowing sediment and soluble pollutants to settle out before leaving the site. text/html 2022-05-16T19:40:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=thermal_mitigation&rev=1652730010&do=diff Thermal Mitigation Development in thermally sensitive areas is required to mitigate thermal pollution. Rainfall is heated after landing on hot impervious surfaces, with the resulting runoff then flowing into receiving waters where it mixes, and potentially increases the base temperature of the surface water. text/html 2022-05-10T20:20:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=tree_planting&rev=1652214040&do=diff Tree Planting Tree planting stabilizes disturbed areas with perennial vegetation. Trees provide vegetated areas that collect and slow runoff, filtering out sediments and insoluble pollutants and encourage infiltration. In addition, they act as windbreaks and are adaptable to most any area, adding aesthetic beauty and providing habitat for wildlife. text/html 2025-04-02T18:28:16+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=vegetated_swale&rev=1743618496&do=diff Vegetated Swale Vegetated swales are gently sloping, densely vegetated earthen channels that collect and transport stormwater and reduce the temperature of the water. These channels slow runoff and filter out suspended solids and pollutants while promoting infiltration, retaining runoff for a period of less than 24 hours. Stormwater enters the channel and is slowed by the dense vegetation that grows in the swale. As the runoff’s velocity is lowered, sediments and pollutants are removed by th… text/html 2022-09-27T21:09:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=webinar_presentations&rev=1664312988&do=diff Webinar Presentations You, Me & The USLE - February 24, 2022 [Presentation Slides] [Questions and Answers] It's All Impervious to Me! - September 15, 2022 [Presentation Slides] [Questions and Answers] text/html 2025-02-17T15:25:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://danecountystormwatermanual.com/doku.php?id=wet_pond&rev=1739805945&do=diff Wet Pond A wet pond retains a permanent supply of water while also temporarily accumulating stormwater runoff. Its purpose is to reduce stormwater flow velocity and trap sediment and other associated pollutants. Stormwater enters the pond and is temporarily retained, allowing pollutants to settle out. Pollutants, such as metals, nutrients, sediment, and organic substances, are removed by the settling of particulates, biological uptake, consumption, and decomposition.