8 
The Colorado Experiment Station. 
The depth of the silo depends upon the length of the feeding 
period. Knowing the daily amount of feed per animal and the 
length of the feeding period, one can figure out how much silage 
will be needed for the entire herd. Im general, the depth should be 
at least twice the diameter. The following table shows the capac¬ 
ity of silos of various depths and diameters: 
Capacity of Silos. 
Depth of-Inside Diameter of Silo 
», Feet. 
10 ft. 
12 ft. 
14 ft. 
16 ft. 
18 ft. 
20 ft. 
22 ft. 
24 ft 
20 
26 
• . . 
. . . 
. . . 
... 
• • • 
... 
• . . 
24 
37 
54 
73 
96 
• . • 
• . . 
. . • 
• • • 
26 
40 
58 
80 
104 
. . . 
. . . 
. . • 
• • • 
28 
44 
63 
86 
112 
. . . 
• . . 
• . . 
• . . 
30 
47 
68 
92 
120 
152 
188 
• . . 
• . • 
32 
50 
73 
99 
128 
162 
200 
243 
290 
34 
55 
78 
107 
139 
176 
218 
263 
• . • 
36 
59 
85 
115 
150 
190 
235 
285 
339 
38 
63 
91 
124 
162 
205 
254 
307 
. . . 
40 
68 
98 . 
134 
175 
221 
273 
330 
393 
42 
• . • 
• . . 
143 
187 
237 
293 
354 
... 
44 
• . . 
• • . 
150 
196 
248 
309 
371 
417 
46 
... 
. . . 
. . . 
205 
259 
320 
388 
... 
48 
• . . 
• . . 
... 
214 
270 
334 
405 
482 
50 
223 
281 
348 
422 
502 
It is often desirable to compute the amount of silage in a par¬ 
tially emptied silo. In order to do this it would not be accurate 
to figure the depth of silage as if it were the total amount put in. 
The silage at the bottom of course is more firmly packed and there¬ 
fore a cubic foot weighs more than at the top. The following 
table gives the number of square feet of surface area in circles of 
various diameters: 
feet 
Square feet 
feet 
Square feet 
Diameter 
Surface Area 
Diameter 
Surface Area 
10 
78.54 
16 
201.06 
12 
113.10 
18 
254.47 
14 
153.94 
20 
312.16 
The following table gives the weight of silage per cubic foot at 
different depths and the total weight of one square foot of area to 
a given depth: 
