| |
A. baileyana |
A. melanoxylon |
| Number of reports |
31 |
84 |
| Mean DBH |
16" |
19" |
| Mean age |
21 years |
32 years |
| Mean height |
26' |
27' |
| Season of failure: |
|
|
| November-April |
90% |
84% |
| May-October |
10% |
16% |
| Trunk failures |
38% |
39% |
| Branch failures |
13% |
17% |
| Root failures |
49% |
44% |
| Sites: |
|
|
| Residential or street |
55% |
51% |
| Park |
3% |
30% |
| Parking lot |
16% |
7% |
| Other |
26% |
12% |
| Medium/high site use |
74% |
74% |
| Structural defects: |
|
|
| no decay |
43% |
44% |
| some decay |
57% |
56% |
| dense crown |
61% |
33% |
| failed portion dead |
48% |
5% |
| codominance |
19% |
20% |
| Mean branch diameter |
10" |
12" |
| Failure at attachment |
4 of 5 cases |
15 of 18 cases |
| Mean ht. of trunk failure |
2' |
6' |
| Mean diam. of trunk failure |
21" |
16" |
| Trunk fail at ground level |
5 of 10 cases |
19 of 37 cases |
| Wind: |
|
|
| <5mph |
3% |
10% |
| 5-25mph |
29% |
23% |
| >25mph |
68% |
67% |
| Precipitaion: |
|
|
| none |
25% |
34% |
| some |
75% |
66% |
