Difference between revisions of "Design infiltration rate as a function of soil texture for bioretention in Minnesota"
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<td>Silt loam, loam</td> | <td>Silt loam, loam</td> | ||
| − | <td>''' | + | <td>'''MH''' – Elastic silt or elastic silt with sand or gravel |
</td> | </td> | ||
<td>B</td> | <td>B</td> | ||
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<td>Sandy clay loam, silt</td> | <td>Sandy clay loam, silt</td> | ||
<td>'''ML''' – Silt | <td>'''ML''' – Silt | ||
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| − | |||
</td> | </td> | ||
<td>C</td> | <td>C</td> | ||
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'''CH''' – Fat clay or fat clay with sand or gravel or gravelly fat clay | '''CH''' – Fat clay or fat clay with sand or gravel or gravelly fat clay | ||
'''OH''' – Organic clay or organic clay with sand or gravel or gravelly organic clay | '''OH''' – Organic clay or organic clay with sand or gravel or gravelly organic clay | ||
| − | ''' | + | '''OL''' – Organic silt or organic silt with sand or gravel or gravelly organic silt |
| + | '''GC''' – Clayey gravel or clayey gravel with sand | ||
| + | '''SC''' – Clayey sand or clayey sand with gravel | ||
</td> | </td> | ||
<td>D</td> | <td>D</td> | ||
Revision as of 18:29, 2 August 2022
Design infiltration rate as a function of soil texture for bioretention in Minnesota
The values shown in this table are for uncompacted soils. This table can be used as a guide to determine if a soil is compacted. For information on alleviating compacted soils, link here. If a soil is compacted, reduce the soil infiltration rate by one level (e.g. for a compacted B(SM) use the infiltration rate for a B(MH) soil). Link to this table
| Soil texture (USDA classification) | Corresponding Unified Soil Classification | Corresponding hydrologic soil Group (HSG) | Design Infiltration Rate (in/hr) |
|---|---|---|---|
| Gravel, sandy gravel, gravelly sand, and silty gravels | GW – Well-graded gravel or well-graded gravel with sand
GP – Poorly graded gravel or poorly graded gravel with sand |
A | Although a value of 1.63 inches per hour (4.14 centimeters per hour) may be used, it is Highly recommended that you conduct field infiltration tests or amend soils.b See Guidance for amending soils with rapid or high infiltration rates and Determining soil infiltration rates. |
| Sand, loamy sand | GM – Silty gravel or silty gravel with sand SW – Well-graded sand or well-graded sand with gravel | A | 1.63 |
| Sandy loam | SP – Poorly graded sand or poorly graded sand with gravel | A | 0.8 |
| Silty sand | SM – Silty sand or silty sand with gravel | B | 0.45 |
| Silt loam, loam | MH – Elastic silt or elastic silt with sand or gravel | B | 0.3 |
| Sandy clay loam, silt | ML – Silt | C | 0.2 |
| Clay, clay loam, silty clay loam, sandy clay, and silty clay | CL – Lean clay or lean clay with sand or gravel or gravelly lean clay
CH – Fat clay or fat clay with sand or gravel or gravelly fat clay OH – Organic clay or organic clay with sand or gravel or gravelly organic clay OL – Organic silt or organic silt with sand or gravel or gravelly organic silt GC – Clayey gravel or clayey gravel with sand SC – Clayey sand or clayey sand with gravel |
D | 0.06 |