FLUMES AND LOG SLUICES 
447 
quired 68,485 board feet of lumber and approximately 2800 pounds 
of nails, per mile. 
Table VIII 
AMOUNTS OF LUMBER, NAILS AND DAYS' LABOR REQUIRED 
TO CONSTRUCT LUMBER FLUME TRESTLES OF 
VARIOUS HEIGHTSi 
Height in feet 
10 
15 
20 
25 
30 
35 
40 
45 
Lumber, board feet. . 
Nails, pounds 
Labor, days 
50 
1.0 
0.10 
60 
1.75 
0.10 
75 
2.0 
0.10 
125 
3.75 
0.20 
200 
5.0 
0.40 
350 
7.0 
0.50 
500 600 
9.5 10.5 
0.60 0.70 
Height in feet 
50 
55 
60 
65 
70 
75 
80 
Lumber, board feet.. . 
Nails, pounds 
Labor, days 
750 
12.0 
1.00 
1000 
17.0 
1.30 
1300 
20.5 
1.60 
1500 
25.0 
1.90 
1750 
31.0 
2.30 
2000 
35.0 
2.70 
2150 
40.5 
3.10 
Height in feet 
85 
90 
95 
100 
105 
no 
115 
Lumber, board feet... 
Nails, pounds . . 
2350 
47.0 
3.90 
2550 
51.0 
4.8 
2750 
57.0 
5.5 
3000 
61.5 
6.25 
3250 
76.0 
7.00 
3450 
90.0 
7.70 
38.50 
112.0 
Labor, days .... 
9.00 
See Fig 
s. 160 and 
161. 
The size and estimated quantity of lumber and the number of 
pounds of nails required to build a "V" flume of the type shown 
in Fig. 158D are given in Table IX. The trestle timbers are 
for an average height of 7 feet. 
OPERATION 
The amount of water required for a flume depends on the size 
of the box, the grade and the amount of leakage. On steep 
grades a flume requires less water than on low grades because 
