Type IIA and IIB Augmented Buffer Width

1. Type IIA and IIB Augmented Buffer Width Example 1: Terrace top break is beyond full width of augmented buffer Terrace top break Augmented buffer for Type IIA waterbody 31 75’ Buffer 150’ 175’ Augmented buffer for Type IIB waterbody

2. Type IIA and IIB Augmented Buffer Width Example 2: Terrace top break is within augmented buffer - buffer ends at terrace top Terrace top break 32 Buffer (150’) Augmented buffer (e.g., 50’)

3. Type IIA and IIB Augmented Buffer Width Example 3: Terrace top break within buffer – no augmented buffer Terrace top break 33 No augmented buffer Buffer 150’

4. Apex of point bar Augmented buffer on outer bend subject to erosion Type IIA waterbody 5 stream widths downstream (1000’) 3 stream widths upstream (600’) 225’ 150’ 150’ 34 No point bar Site for measuring stream width 200’ Point bar flow OHWM Edge of standard buffer Edge of augmented buffer on outer bend subject to erosion

5. Apex of point bar 5 stream widths downstream (1000’) Augmented buffer on outer bend subject to erosion Type IIB waterbody 3 stream widths upstream (600’) 325’ 150’ 150’ 35 No point bar Site for measuring stream width 200’ Point bar flow OHWM Edge of standard buffer Edge of augmented buffer on outer bend subject to erosion