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 |