1 / 57

Methods Of Sediment Control Steve Pudenz

Methods Of Sediment Control Steve Pudenz. AGC /NDOR Partners in Construction. Properly installed silt fence is a very effective temporary sediment control device. 100 ft. of silt fence can retain 180 tons of sediment. AGC /NDOR Partners in Construction. Goal of Silt Fence.

yeriel
Download Presentation

Methods Of Sediment Control Steve Pudenz

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Methods Of Sediment Control Steve Pudenz AGC/NDOR Partners in Construction

  2. Properly installed silt fence is a very effective temporary sediment control device 100 ft. of silt fence can retain 180 tons of sediment. AGC/NDOR Partners in Construction

  3. Goal of Silt Fence • Detain water for sedimentation to occur. • Occasionally used to divert stormwater to a storage area. • Retain large soil particles and prevent loss from the site. AGC/NDOR Partners in Construction

  4. Effective silt fence works like a chain… Placement Installation Support Attachment Quantity Compaction Each link must work; if one link fails, the system fails AGC/NDOR Partners in Construction

  5. Placement • Refers to specific location on each construction site. • Specific design (layout) at each location. Correct Incorrect AGC/NDOR Partners in Construction

  6. J-hooks Designs called J-hooks insure water & sediment pond behind each silt fence. AGC/NDOR Partners in Construction

  7. Proper Silt Fence Placement AGC/NDOR Partners in Construction

  8. Proper Placement • Should pond water • Stop sediment before it reaches the pavement • Withstand concentrated flows • Should insure sedimentation AGC/NDOR Partners in Construction

  9. The ends must always be long enough to pond water and sediment.

  10. Incorrect Silt Fence Placement AGC/NDOR Partners in Construction

  11. Myth – flat sites do not need protection AGC/NDOR Partners in Construction

  12. Leave room for sediment storage at toe of slope AGC/NDOR Partners in Construction

  13. DO NOT use silt fence: • Where you can not create a storage area for runoffExamples: Steep slopes, small areas, or shortsegments • Where you can not prevent water running around the end • In a V-shaped or shallow channel AGC/NDOR Partners in Construction

  14. On-site adjustment is MANDATORY! • Grading plans are often drawn in an office many months prior to disturbance. • The ESC contractor must adjust the plan to properly control the site, or at a minimum notify the site managers of potential problems. AGC/NDOR Partners in Construction

  15. QUANTITY Relates to area of control. The volume of water from a large site can not be controlled in one run of silt fence. Multiple locations or storage areas are often required. AGC/NDOR Partners in Construction

  16. Long runs should be avoided. They tend to accumulate sediment in one area, causing premature overflow. AGC/NDOR Partners in Construction

  17. Breaking up a run more than doubles storage area AGC/NDOR Partners in Construction

  18. Multiple runs slow runoff velocity and add storage area on site. AGC/NDOR Partners in Construction

  19. Proper Quantity • 100 ft. of silt fence per 10,000 sq. ft • of disturbed area seems to be an adequate rule of thumb for sediment control AGC/NDOR Partners in Construction

  20. Installation Relates to how the fabric is placed in the soil, appropriate depth of placement, and appropriate backfill for an effective silt fence. AGC/NDOR Partners in Construction

  21. Two Methods of Installation • Trenching • Mechanical/Slicing AGC/NDOR Partners in Construction

  22. Mechanical Installation AGC/NDOR Partners in Construction

  23. Mechanical Installation • Provides consistent, dependable silt fence • Reduces many labor related installation problems • Disturbs but does not excavate soil which creates an optimal condition for compaction AGC/NDOR Partners in Construction

  24. Improper installation often leaves silt fence blowing in the wind. AGC/NDOR Partners in Construction

  25. Compaction • Relates to soil permeability. Loose or trash-filled backfill is easily saturated with water and washed out under the silt fence. • Compacted soil resists saturation, and prevents washouts. AGC/NDOR Partners in Construction

  26. Example of Poor Compaction AGC/NDOR Partners in Construction

  27. Support Relates to a support system that will not fall over under the load of a full silt fence. AGC/NDOR Partners in Construction

  28. 30” min. above ground 60" steel Support Post Spacing Posts should be 5 ½ ft. tall and spaced a maximum of 6 ft. apart. AGC/NDOR Partners in Construction

  29. Properly supported silt fence will carry 24 inches of sediment. AGC/NDOR Partners in Construction

  30. Proper attachment is the glue of the system, combing the strength of the fabric and the support posts into a unified structure. Attachment AGC/NDOR Partners in Construction

  31. Attachment • Steel posts - recommend 3 plastic ties per post, located in the top 8 inches of the fabric, placed diagonally to attach as many threads as possible. • Wood posts - recommend several staples per post AGC/NDOR Partners in Construction

  32. Attachment must be adequate to support a fully loaded silt fence AGC/NDOR Partners in Construction

  33. Maintenance & Inspection • Key to successful silt fence • Inspect weekly and after every ½” rain event or as needed • Clean out when over half full or install a new silt fence above or below the current fence AGC/NDOR Partners in Construction

  34. NDOR Silt Fence • Low Porosity • High Porosity • Coir Fence AGC/NDOR Partners in Construction

  35. Low Porosity Silt Fence • Most Common • Used to contain sediment • Used for perimeter control • 42” Tall is NDOR standard • Low Profile is 36” tall used in urban areas and medians AGC/NDOR Partners in Construction

  36. High Porosity Silt Fence • Used across ditches • Used to slow the flow of water • Not to be used for perimeter control AGC/NDOR Partners in Construction

More Related