Table 1 Estimated concrete silo capacities for forages, in tonnesa
Silo Diameter x Settled Depth                 Alfalfa Silage                      Corn Silage
(m)
(ft)
40% b
50%
60%
55%
60%
65%
3.7 x 9.1
12 x 30
32
40
52
43
49
56
12 x 30
3.7 x 12.2
12 x 40
45
56
73
60
68
79
12 x 40
3.7 x 15.2
12 x 50
57
71
94
77
88
101
12 x 50
 
 
 
 
 
 
 
 
 
4.3 x 12.2
14 x 40
63
78
103
84
96
110
14 x 40
4.3 x 15.2
14 x 50
81
101
134
110
124
143
14 x 50
4.3 x 16.8
14 x 55
90
113
149
122
139
159
14 x 55
 
 
 
 
 
 
 
 
 
4.9 x 15.2
16 x 50
109
137
181
148
167
191
16 x 50
4.9 x 18.3
16 x 60
135
169
224
182
206
235
16 x 60
4.9 x 19.8
16 x 65
147
185
245
200
225
258
16 x 65
                 
5.5 x 15.2
18 x 50
142
178
236
191
216
247
18 x 50
5.5 x 18.3
18 x 60
176
221
293
237
266
304
18 x 60
5.5 x 21.3
18 x 70
211
264
351
283
317
361
18 x 70
6.1 x 18.3
20 x 60
224
281
372
298
335
381
20 x 60
6.1 x 21.3
20 x 70
268
337
446
357
399
453
20 x 70
6.1 x 24.4
20 x 80
314
394
522
415
464
526
20 x 80
7.3 x 18.3
24 x 60
338
423
559
442
494
560
24 x 60
7.3 x 21.3
24 x 70
407
511
674
529
590
667
24 x 70
7.3 x 24.4
24 x 80
479
600
790
616
685
773
24 x 80
7.3 x 27.4
24 x 90
551
690
908
704
782
880
24 x 90
9.1 x 24.4
30 x 80
796
993
1297
989
1164
1343
30 x 80
9.1 x 27.4
30 x 90
920
1146
1494
1129
1341
1547
30 x 90
9.1 x 30.5
30 x 100
1046
1301
1692
1270
1520
1754
30 x 100
9.1 x 33.5
30 x 110
1173
1457
1891
1411
1701
1962
30 x 110

a1 tonne = 1000 kg; the capacity in tons (2000 lb) can be obtained by multiplying the capacities in the table by 1.1.bmoisture content in percent (wet basis)

Information supplied by The Ontario Ministry of Agriculture and Food