m |
m |
||
Line 43: | Line 43: | ||
**Infiltration basins, trenches, dry wells, and underground practices are [https://stormwater.pca.state.mn.us/index.php?title=Infiltration discussed together in the manual]. When there are differences between the practices they are pointed out. Examples include [https://stormwater.pca.state.mn.us/index.php?title=BMPs_for_stormwater_infiltration#Information_tables information tables]. | **Infiltration basins, trenches, dry wells, and underground practices are [https://stormwater.pca.state.mn.us/index.php?title=Infiltration discussed together in the manual]. When there are differences between the practices they are pointed out. Examples include [https://stormwater.pca.state.mn.us/index.php?title=BMPs_for_stormwater_infiltration#Information_tables information tables]. | ||
*Can you compare annual maintenance costs of infiltration basins vs. subgrade infiltration? | *Can you compare annual maintenance costs of infiltration basins vs. subgrade infiltration? | ||
− | **The manual does not provide specific information on cost for different infiltration practices. [https://www.pca.state.mn.us/sites/default/files/p-gen3-13x.pdf | + | **The manual does not provide specific information on cost for different infiltration practices. [https://www.pca.state.mn.us/sites/default/files/p-gen3-13x.pdf This paper] may provide some useful information. Also see [https://www.lrrb.org/PDF/200523.pdf 1], [https://www3.epa.gov/npdes/pubs/usw_d.pdf 2 (Table 6-10)], and [https://www.novaregion.org/DocumentCenter/Home/View/1675 3]. |
*Design: Please clarify the bottom of the infiltration practice. Is it the floor of the basin or the bottom of the planting medium, ripped area, and abutment to the in situ soil. | *Design: Please clarify the bottom of the infiltration practice. Is it the floor of the basin or the bottom of the planting medium, ripped area, and abutment to the in situ soil. | ||
**If engineered media are utilized, the bottom of the practice is the base of the engineered media. If native soils are used, the base would be the depth to which excavation occurred. [https://stormwater.pca.state.mn.us/index.php?title=File:Illustration_of_depth_to_bedrock_or_wt.jpg This diagram] may be useful and includes an example where soils were ripped to alleviate compaction. | **If engineered media are utilized, the bottom of the practice is the base of the engineered media. If native soils are used, the base would be the depth to which excavation occurred. [https://stormwater.pca.state.mn.us/index.php?title=File:Illustration_of_depth_to_bedrock_or_wt.jpg This diagram] may be useful and includes an example where soils were ripped to alleviate compaction. |
Below are questions submitted during the December 15, 2016 webinar on Infiltration. Answers include links and if appropriate, links to additional information.