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| Description | Range of dry unit weight (lbs/cu ft) | Range of optimum moisture content (percent) |
| Sand-silt clay mix with plastic fines | 110 – 130 | 15 - 11 |
| Clayey sands, sand-clay mix | 105 – 125 | 11 - 10 |
| Inorganic silts and clayey silts | 95 – 120 | 24 - 12 |
| Inorganic clay | 95 – 120 | 24 - 12 |
| Organic silts | 80 – 100 | 33 - 21 |
| Inorganic clay of high plasticity | 75 - 105 | 36 - 19 |
| Organic clays | 65 – 100 | 45 - 21 |
Shown in Table 1 are values of standard optimum moisture content and density for various soils in fish farms. Optimum moisture content is usually 2 to 5 percent less than the plastic limit of the soil.
| Purpose of Fill | Density required fine-grained soil | Suggested range of moisture content-dry to wet of optimum (%) |
| Fills requiring nominal amount of strength and incompressibility as earth dikes | 90% | -3 to +3 |
Shown in Table 2 is a typical compaction guide based on the Proctor Test. With the start and during construction, field density tests should be made. Satisfactory compaction is attained if 2/3 of all field values fall within a range of 2–3%. Unsatisfactory compaction is evidenced where only 2/3 of all field values fall in a range of +5%.
