|
|
||
 Appendix B: Bioengineering for Streambank Erosion Control -- Guidelines
Table 4. Man-hour costs of installing wattling and willow cuttings at Lake
Tahoe in 1973. (Leiser 1983)
Prepare and install wattling (1,140 linear ft)
Labor
Man-hours
C
Scaling or cutting back the bank or slope
2
C
Cutting willow whips
27
C
Prepare (stack, tie, load)
28
C
Layout
9
C
Install
75
C
Downtime (rain)
10
C
Travel (from Sacramento, Marysville)
42
193
Unit Man-hour Cost: 1,140/193 = 5.9 linear ft per man-hour
Prepare and plant willow cuttings (8,000 cuttings)
Labor
Man-hours
C
Scaling
2
C
Cutting
9
C
Prepare
34
C
Plant
76
C
Downtime (rain)
10
C
Travel (from Sacramento, Marysville)
42
173
Unit Man-hour Cost: 8,000/173 = 46.2 cuttings per man-hour
Dormant Willow Post Method
Roseboom (1995) reported that for bioengineering work on a 600-ft reach at Court
Creek, Illinois, it took 5 men two 8-hr days to install 675 willow (12- ft tall) posts on 4-ft
centers. This also included installation of a rock toe (20 tons of 10" riprap) with a coir
geotextile roll along 300 ft. Also, 60 cedar trees were laid and cabled along the the toe of the
slope to trap sediment. This included an excavator operator along with the 4 other men
previously mentioned. This equates to about 17 posts per man-hour that includes harvesting
B-85
|
||
|
||
