Ranking Structural integrity Structural integrity
1 (Intact) No visible damage; fully operational in terms of integrity No visible damage; fully operational in terms of integrity
2 (Damaged) Structure functions as intended; but at least 10% of the structure visibly damaged; usually involved movement of one or more boulders Structure functions as intended; but at least 10% of the structure visibly damaged; usually involved movement of one or more boulders
3 (Impaired) Structural components in general location of original structure, but feature no longer functions as intended; 25-75% of structure remaining Structural components in general location of original structure, but feature no longer functions as intended; 25-75% of structure remaining
4 (Failed) Significant part (>75%) have been removed from site; severely fragmented; incapable of achieving intended objective Significant part (>75%) have been removed from site; severely fragmented; incapable of achieving intended objective
Ranking Erosion Deposition
0 (Minor) None visible None visible
1 (Minor) Minor localized erosion along margins of feature; structure maintains continuity with bank and bed; undermining of footings Minor deposition over center of structure; pool remains well defined
2 (Moderate) Localized erosion visible, which is likely to continue. Eroded area likely to influence flow Deposition along 25-50% of structure in channel; pool poorly developed and/or partially filled
3 (Moderate) Structure remains in contact with bank, but erosion has occurred along entire zone of contact with bank. Unintended erosion of channel bed must exceed 50 cm and be clearly related to the structure Deposition occurs along 50-75% of structure’s length in channel; pool very weakly defined or filled
4 (Severe) Structure partially detached from bank; complete detachment eminent; feature no longer functions as intended Sediments bury 75-90% of structure in channel; no pool present
5 (Severe) Structure completely detached from bank; no longer performs function as intended Sediments bury 90-100% of structure in channel; no pool present