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Water & Sediment Control Basin (WASCOB) Mike Cox State Conservation Engineer

Water & Sediment Control Basin (WASCOB) Mike Cox State Conservation Engineer. Contractor Certification Training March 2008. Water & Sediment Control Basin (638). Purpose: 1) Reduce gully erosion 2) Trap Sediment 3) Reduce and manage downstream runoff.

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Water & Sediment Control Basin (WASCOB) Mike Cox State Conservation Engineer

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  1. Water & Sediment Control Basin (WASCOB) Mike Cox State Conservation Engineer Contractor Certification Training March 2008

  2. Water & Sediment Control Basin (638) • Purpose: 1) Reduce gully erosion • 2) Trap Sediment • 3) Reduce and manage downstream runoff • WASCOBs are typically used when drainage areas are smaller. • WASCOB Spacing is to reduce slope length and accommodate equipment width

  3. Farmed - WASCOB • Slopes are flatter (5:1 to 10:1) • More yardage must be used during construction • Harder to fit into steep areas

  4. Grassed - WASCOB • Slopes are steeper (3:1 to 5:1) • Less yardage used during construction • Fits better into steep areas • Slopes steeper than 5:1 must be grassed

  5. Compaction of Earth Fill • Use 6-9” Lifts • Dozer or Loaded Pan on Each Lift – 2 passes • Sheepsfoot Roller – 1 pass

  6. Borrow Areas • Don’t get borrow at the channel • Unless plans call for the channel to be excavated • Borrow should come from field above • Remember to stockpile topsoil

  7. Outlets for WASCOBs • Underground Outlet (620) • Outlet tile is sized per orifice diameter • Orifice plates must be installed

  8. Risers • Must be minimum of 2.5’ in height

  9. Installation Report http://www.in.nrcs.usda.gov/technical/engineering/engineering.html Look Under Contractor Certification Section

  10. Helping People Help the Land

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