Common use of Geomorphology Clause in Contracts

Geomorphology. ▪ Landforms and geology can be more important here than buffer width. For example, in the San ▇▇▇▇ Islands, there can be a 45° slope on basalt form that can be very stable. ▪ Geomorphic shore form is an important consideration – geologic legacy, landscape position, density, slope, etc. Use of ▇▇▇▇▇▇▇ (2008) geomorphic classification system may be useful (Appendix F). ▪ Riparian areas can increase slope stability (through root structure) and increase water interception and absorption. Protecting natural rates of sediment delivery and protecting processes and functions of nearshore ecosystems may be achieved by establishing and maintaining adequate riparian buffers. ▪ Upslope alterations can be contributing factors to slope instability. ▪ It is important to consider flow paths; for example, slope stability may be associated more with altered upland drainage patterns or precipitation patterns. Buffer width versus landform may be the most important factor. For example, steeper slopes, particularly those with underlying geologic instability, require wider buffers. Bluff Height (ft) Stable (1:1)(450) Moderately Stable (2:1)(300) Unstable (1:1)(450)+ (2:1)(300) 20 20 40 60 40 40 80 120 60 60 120 180 80 80 160 240 100 100 200 300 120 120 240 360 140 140 280 420 160 160 320 480 180 180 360 540 200 200 400 600