Framework Water Quality Restoration Plan And Total Maximum Daily Loads (Tmdls) for the Lake Helena Watershed Planning Area : volume Ii 2004 Appendix D
Framework Water Quality Restoration Plan And Total Maximum Daily Loads (Tmdls) for the Lake Helena Watershed Planning Area : volume Ii 2004 Appendix D
Montana.Dept. of Environmental Quality
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The ratio of stream bank height to bankfull stage. 2. The ratio of riparian vegetation rooting depth to stream bank height. 3. The degree of rooting density. 4. The composition of stream bank materials. 5. Stream bank angle (i.e., slope). 6. Bank surface protection afforded by debris and vegetation. To determine annual sediment load from eroding stream banks in each BEHI category, bank retreat rates developed by Rosgen (2001) were utilized (Table 2-1). The rate of erosion was then multiplied by... the area of eroding bank (square feet) to obtain a volume of sediment per year, and then multiplied by the sediment density (average bulk densities were 1.41 g/cm^ within granitic parent material, and 1.31 g/cm^ outside of the batholith, USDA, 1998) to obtain a mass of sediment per year. Table 2-1. Bank Retreat Rates Used for Banks of Varying Severity of Erosion Bank Erosion hHazard Condition Retreat Rate from Rosgen 2001 (ft/yr) - used for A and B chianneis Retreat Rate from Rosgen 2001 (ft/yr) - used for C channeis Low 0.045 0.09 Moderate 0.17 0.34 High 0.46 0.7 Severe 0.82 1.2 Pubiic Review Draft D-5 Remote Quantification Appendix D Total sediment load from eroding streambanks of each sediment-listed stream was generated by averaging intra-segment (reach) sediment loads (on a percentage stream length basis), and applying this value to the entire perennial stream length within the segment.
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