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Soil Erosion

Soil Erosion. Grading Standards in the UDC. The purpose of erosion control as stated in the UDC is to prevent or reduce the potential deposition of soil or sediment to the waters of the state and adjacent properties.

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Soil Erosion

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  1. Soil Erosion

  2. Grading Standards in the UDC • The purpose of erosion control as stated in the UDC is to prevent or reduce the potential deposition of soil or sediment to the waters of the state and adjacent properties. • The finished grade of the soil shall slope away from the dwelling at a rate of at least ½ inch per foot • The graded slope away from the dwelling shall be at least a minimum distance of 10 feet, or to the lot line, whichever is less.

  3. Controls Come First • Land disturbing construction activities, except those activities necessary to implement erosion or sediment control practices, may not begin until the sediment control practices are in place for each area to be disturbed in accordance with the approved plan.

  4. A disturbed area shall be considered stabilized by vegetation when a perennial cover has been established with a density of at least 70%.

  5. Mandated Practices for Less than 1 Acre Disturbances • A method to prevent or reduce soil from leaving the site via entries or roads. • Storm water inlet protection. • Protection of adjoining waters. • Drainage way protection. • Dewatering activity sediment reduction. • Stockpile protection.

  6. 5 Methods • The Revised Universal Soil Loss Equation. • Silt fences. • Seed and mulch. • Best Management Practices to achieve 40% reduction in sediment load. • A unique designed submitted for review.

  7. More than 1 Acre Sites • An 80% sediment load reduction is required. • Mandated practices are the same as small sites.

  8. Methods • Same methods as small sites except silt fences are not recognized.

  9. Stone Tracking Pad • Either a stone tracking pad or tire washing station shall be used at all points of construction egress. • This standard applies where construction traffic is likely to transport sediment off site. • The aggregate in a tracking pad shall be placed in a layer at least 12 inches thick.

  10. Tracking Pad • Stone tracking pads shall be underlain with a WisDOT Type R geotextile fabric to prevent migration of underlying soil into the stone if: • Site has a high water table • Where saturated soil conditions are expected

  11. Tracking Pads • The tracking pad shall be • the full width of the egress point. • a minimum 50 feet long.

  12. Tracking Pads • Surface water must be prevented from passing through the tracking pad. Flows shall be diverted away from tracking pads or conveyed under and around them. • A culvert would be an approved method.

  13. Tire Washing Station • A tire washing station is another method of dealing with keeping soil on the site. It must be located on-site. • The wash rack for a tire washing station shall consist of heavy grating over a lowered area. • Rocks lodged between the tires of dual wheel vehicles shall be removed prior to leaving the construction site.

  14. Maintenance • Any sediment tracked onto a public or private road should be removed by street cleaning NOT flushing before the end of each working day. • Tracking pads and tire washing stations shall, at a minimum, be inspected weekly. • 24 hours after a precipitation event that produces 0.5 inches of rain or more during a 24-hour period would create a new mandatory inspection of a tracking pad.

  15. Maintenance • The tracking pad performance shall be maintained by scraping or top-dressing with additional aggregate. • If the initial thickness of a tracking pad is 12 inches and must be maintained at 12 inches.

  16. Start at question 24

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