The introduction of wood into streams would be both continual (normal tree fall) and episodic (due to fires and flood). This results in a large range of natural variation under historic disturbance regime in the amount of wood in streams. In general, the number of pieces of wood in a stream decreases as streams get larger. Stream habitat features, such as bank stability, pools, large woody material and sediment would be within reference ranges. Some reference ranges for specific habitat features are shown below in tables 1 and 2. Table 1. Desired stream habitat features in metasedimentary and sedimentary parent material Habitat Feature Median Minimum Maximum One standard Influential deviation Variables Large Woody 222 15 910 82-461 Stream size, forest Material disturbance, (pieces/mile) stream type Pool Frequency 35 4 154 10-67 Stream type, woody (pools/mile) material Table 2. Desired stream habitat features in metasedimentary parent material Habitat Features Median Minimum Maximum One Influential Standard Variables deviation Residual Pool Depth 0.43 0.17 1.0 0.24-0.67 Stream type, (meter) bankfull width, stream power Median Reach Particle 41 17 98 26-65 Channel slope, Size (mm) stream power, sinuosity, woody material Percent Pool 44 7 88 26-64 Stream type, Percent Stable Banks 74 18 100 53-95 Stream type, bank material Bank Angle 112 56 148 87-132 Stream type, bank material
The introduction of wood into streams would be both continual (normal tree fall) and episodic (due to fires and flood). This results in a large range of natural variation under historic disturbance regime in the amount of wood in streams. In general, the number of pieces of wood in a stream decreases as streams get larger. Stream habitat features, such as bank stability, pools, large woody material and sediment would be within reference ranges. Some reference ranges for specific habitat features are shown below in tables 1 and 2. Table 1. Desired stream habitat features in metasedimentary and sedimentary parent material Habitat Feature Median Minimum Maximum One standard deviation Influential Variables Large Woody Material (pieces/mile) 222 15 910 82-461 Stream size, forest disturbance, stream type Pool Frequency (pools/mile) 35 4 154 10-67 Stream type, woody material Table 2. Desired stream habitat features in metasedimentary parent material Habitat Features Median Minimum Maximum One Standard deviation Influential Variables Residual Pool Depth (meter) 0.43 0.17 1.0 0.24-0.67 Stream type, bankfull width, stream power Median Reach Particle Size (mm) 41 17 98 26-65 Channel slope, stream power, sinuosity, woody material Percent Pool 44 7 88 26-64 Stream type, Percent Stable Banks 74 18 100 53-95 Stream type, bank material Bank Angle 112 56 148 87-132 Stream type, bank material
FNF%202006%20Modified%20Draft%20Plan_Dec%202013.docx