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Deposition Zone

Deposition Zone . 16.

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Deposition Zone

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  1. Deposition Zone 16 This training was prepared by the U.S. Department of Agriculture (USDA) team of Otto Gonzalez-USDA Foreign Agricultural Service (Team Leader), Jon Fripp (Civil Engineer) and Chris Hoag (Wetland Plant Ecologist)-USDA Natural Resources Conservation Service (Civil Engineers). Fripp and Hoag were the primary authors of this material. The U.S. AID provided funding support for the USDA team.

  2. The deposition zone is at the end of the end of the watershed. Water and sediment stops here It has the flattest slope and the thickest layer of good soil.

  3. We often see lakes or wetlands in this zone This depositional area can be natural or made by man • A stream or river may naturally move frequently as it enters this zone. • The water levels may rise when it rains • Soil is often loose and may be impacted by wind erosion more than the other zones

  4. There can be problems if too much soil is delivered to this zone Can bury crops and good soil Can cause flooding Can impact transportation

  5. Wind can be very damaging to loose soil in this zone And wind can also be damaging to upstream collection and catchments

  6. Strategy or Goal for Deposition Zone: • Keep the soil from being blown away by the wind • Keep too much sediment from being deposited • Manage and use (agriculture, grazing, rocks, sand, bricks, etc • Management Practices • Effective Use • Preserve Vegetation Rehabilitation Treatments: Wind/Cold Breaks Wetland Restoration

  7. But before we talk about treatments, we need to be able to ask if the source of the problem we may be seeing here is actually the fault of an upstream collection zone or a transport zone. If that is the situation then work should also be done on these other areas.

  8. You may need to work on several sub watershed – collection zones and several streams- transport zones Several Zones provide sediment and water to a deposition zone

  9. The End

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