Infiltration rates observed in Minnesota
Infiltration rates observed in Minnesota.
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| Source of data | Range of infiltration rates (in/hr) | Number of monitorign sites | Brief description of site | Monitoring dates |
|---|---|---|---|---|
| South Washington Watershed District | 0.14 to 3.101 | 1 | Monitoring data collected at regional basin CD-P85 | 1999 to 2005 |
| South Washington Watershed District | 0.03 to 0.6 | 4 | Monitoring data collected at 4 natural infiltration basins. Soils in the basins consist of silt loams underlain by sands and gravel interspersed with clayey-silty sediments. | 1999 to 2005 |
| South washington Watershed District | 0.02 to 5.0 | 1 | Infiltration trench located at the Math and Science Academy in Woodbury, MN. in order to intersect more permeable material, trench is 15 feet deep for a portion of the practice. underlying material is variable: till and sand/gravelly sand. Trench receives pretreatment of stormwater prior to infiltration. | 1999 to 2005 |
| South washington Watershed District | 0.02 to 3.02 | 1 | Infiltration trench located in regional basin CD-P85. These trenches are an average of 13 feet deep. Underlying material is sand and gravelly sand. | 1999 to 2005 |
| Rice Creek Watershed District | 0.03 to 0.59 | 4 | Monitoring data collected at 3 rain gardens and an infiltration island located at Hugo City Hall. Soils in the basin consist of silty fine sand with a shallow depth to the water table. Trench receives significant pretreatment of stormwater prior to infiltration. | 2002 to 2003 |
| Brown's Creek Watershed District | 0.01 to 0.20 | 2 | Monitoring data collected at 2 infiltration basins. soils in the basins consist of silty sand and silt clay interspersed with clayey sandy silt. | 2000 to 2005 |
| Field's of St. Croix, Lake Elmo, MN. | 0.02 to 0.14 | 3 | Monitoring data collected at 3 infiltration basins located in a residential development. Soils in the basins consist of sandy loam and silt loam (HSG B). | 2001 to 2003 |
| Bradshaw Development, Stillwater, MN | 0.26 to 0.28 | 1 | Monitoring data collected in 1 infiltration basin located in a commercial develolment. soils in the basin consist of a silty sand. | 2005 |
1The high end of this range (3.1 inches per hour) is not representative of typical rates for similar soil types. This facility is pweriodically subject to 25 foot depths of water, is underlain by mmore than 100 feet of pure sand and gravel without any confining beds and the depth to the water table is greater than 50 feet below the land surface. in addition, two infiltration enhancement projects have been constructed in the bottom of the facility to promote infiltration: five dry wells and two infiltration trenches have been operating in CD-P85 at various periods of the monitoring program.