Earth
Anchor
Size
(Inches)
Minimum Vertical Depth (FT)
Hard Pan
Soil

Holding In
LBS
Class 1 Soil


Dense Sand & Gravel
Class 2 Soil


Medium Sandy Gravel
Class 3 Soil


Loose Medium To Fine Sand
Class 4 Soil


Loose Fine Uncompacted Sand


Above Ground


Below Water
2 Feet
600 lbs
300 lbs
170 lbs
100 lbs
50 lbs
30%
15%
2.5 Feet
1,300 lbs
700 lbs
450 lbs
240 lbs
120 lbs
25%
15%
2.5 Feet
2,300 lbs
1,200 lbs
750 lbs
400 lbs
200 lbs
25%
15%
3.5 Feet
5,000 lbs
3,000 lbs
2,000 lbs
1,200 lbs
600 lbs
20%
10%
4 Feet
9,000 lbs
6,500 lbs
3,500 lbs
2,200 lbs
1,250 lbs
20%
10%
5 Feet
14,000 lbs
11,000 lbs
7,000 lbs
4,000 lbs
2,400 lbs
15%
8%
6 Feet
20,000 lbs
17,000 lbs
11,500 lbs
7,000 lbs
4,000 lbs
15%
8%

NOTES:

  1. In determining vertical depth to the Ground Anchor (Laconia Earth Anchor), the thickness of topsoil, peat, soft clay and similar soft soils should not be included.

  2. The applicable class of soil is that present within a zone from the Ground Anchor to a point from one to three feet above the anchor, depending upon anchor size.

  3. For Ground Anchors at minimum depth in Soil Classes 1-4, reduce ultimate pullout resistance by percentage given for each foot ground water table is above anchor. No reduction is required for hardpan.

  4. For Ground Anchors driven to depths greater than the minimum Soil Classes 1-4, the ultimate pullout resistance may be increased by the percentage given for each additional foot below the specified minimum. The ultimate pullout resistance shall not exceed twice the tabulated value, however. No allowance for additional depth is made for hardpan.