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Riparian/Land Use/Bank Erosion

Riparian/Land Use/Bank Erosion. Riparian Width. Riparian vegetation includes trees, shrubs and wetlands; not grasses Select one width or two and average for each bank, then average banks together. Woody Riparian Quality.

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Riparian/Land Use/Bank Erosion

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  1. Riparian/Land Use/Bank Erosion

  2. Riparian Width • Riparian vegetation includes trees, shrubs and wetlands; not grasses • Select one width or two and average for each bank, then average banks together

  3. Woody Riparian Quality • Effects increase in importance as they accumulate in a watershed: Death of a Thousand Cuts! • Habitat forming functions • Bank stabilization • Retention/uptake of excess water • Groundwater recharge/maintenance of dry weather flows • Assimilation/storage of nutrients and sediment • Temperature moderation

  4. Shading • In streams with good habitat, good riparian shading and elevated nutrients, effects of these nutrients may be somewhat moderated by limiting light penetration • Sunlight is match thrown on nutrient fuel

  5. Riparian Condition

  6. Adjacent Landuse • Area outside of existing riparian that can strongly affect stream via runoff • Screening data, most accurate data from photos or GIS

  7. Land Use Assessment by GIS

  8. Bank Erosion • Scores based on Streambank Soil Alteration Rating of Platts et al. (1983) • In many case bank erosion is greatest source of bedload • False banks are considered as eroded

  9. Riparian encroachment ultimately leads to bank destabilization and bank erosion

  10. False Banks • False banks are formed when stream banks are trampled by livestock and a steep bank is formed back from the waters edge

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