LEADING THE DRAINAGE INDUSTRY SINCE 1935
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Fill Heights
  Corrugated Metal Pipe
 
3x1 FILL HEIGHT TABLE   pdf icon Download Document.
 
2 2/3 x 1/2 STANDARD CMP FILL HEIGHT
Height-of-Cover Limits for Corrugated Steel Pipe
H20 or H25 LIVE LOAD 22/3 x 1/2
Diameter or Span, (in.) Minimum
Cover, (in.)		 Maximum Cover, (ft.)
Specified Thickness, (in.)
0.064 0.079 0.109 0.138 0.168
12 12 248 310      
15 12 199 248      
18 12 168 207      
21 12 142 178 249    
             
24 12 124 155 218    
30 12 99 124 174    
36 12 83 103 145 186  
42 12 71 88 124 160 195
             
48 12 62 77 109 140 171
54 12   66 93 122 150
60 12     79 104 128
66 12     68 88 109
             
72 12       75 93
78 12         79
84 12         66
  Deep Core Corrugated Metal Pipe
Height-of-Cover Limits for Corrugated Steel Pipe
H20 or H25 3 x 1 in. Corrugations
Diameter or Span, (in.) Minimum
Cover, (in.)		 Maximum Cover, (ft.)
Specified Thickness, (in.)
0.064 0.079 0.109 0.138 0.168
54 12 56 70 98 126 155
60 12 50 63 88 114 139
66 12 46 57 80 103 126
72 12 42 52 73 95 116
78 12 39 48 68 87 107
84 12 36 45 63 81 99
90 12 33 42 59 76 93
96 12 31 39 55 71 87
102 18 29 37 52 67 82
108 18   35 49 63 77
114 18   32 45 58 71
120 18   30 41 54 66
126 18     39 50 62
132 18     36 47 57
138 18     33 43 53
144 18       39 49
  Spiral Rib
Height-of-Cover Limits for Steel Spiral Rib Pipe
¾ x ¾ x 7½ in. and ¾ x 1 x 11½ in Configuration, H20 or H25 LIVE LOAD
Diameter or Span, inches Minimum Cover,
inches		 Maximum Depth of Cover Above Top of Pipe (Feet)
¾ x 1 x 11½ in. Corrugation ¾ x ¾ x 7½ Corrugation
0.064 0.079 0.109 0.064 0.079 0.109 0.138
24 12 51 72 121 51 72 121  
30 12 41 58 97 41 58 97  
36 12 34 48 81 34 48 81  
42 12 29 41 69 29 41 69  
48 12 26 36 61 26 36 61  
54 18 23 32 54 (23) 32 54  
60 18 (21) 29 49 [21] 29 49 73
66 18 [19] 26 44   (26) 44 65
72 18   (24) 40   [24] 40 59
78 24   [22] 37   [22] (37) 55
84 24   [21] (35)     (35) 52
90 24     (32)     [32] 47
96 24     [30]     [30] 44
102 30     [29]     [29] 43
108 30     [27]       (41)
Maximum Fill Heights for H2O Loads ¾ x 1 x 8½ in. Profile
Diameter in inches Maximum Fill heights, ft. Spec. Thickness = 0.109
102 36
108 34
114 32
120 31
126 29
132 28
138 27
144 25
Note : Minimum fill height is Diameter/4
  Trishield
TriShield Height of Cover Table
Maximum Cover (Feet) For Specified Thickness
Diameter or Span Minimum Cover Specified Wall Thickness / Gauge
(inches) (inches) 0.064"/16 0.079"/14 0.109"/12
24 12 72 100 167
30 12 57 80 133
36 12 48 67 111
42 12 41 57 95
48 12 36 50 83
54 18 (32) 44 74
60 18 [29] 40 67
66 18 [26] (36) 61
72 18 ** [33] 56
78 24   [31] 51
84 24   ** (48)
90 24     (44)
96 24     [42]
102 30     [37]
108       **
Note :
  1. Sizes indicated in red are not currently available.
  2. Fill heights are for H20 and H25 live loads.
  3. TYPE I installations are allowed unless otherwise shown.
  4. ( ) Requires a TYPE II or TYPE III installation.
  5. [ ] Requires a TYPE III installation.
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