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Infiltration Basins <br />Design <br />Cold Weather Considerations <br />Consideration should be given to the operation of infiltration basins during the winter period. Winter sanding of <br />roads can clog an infiltration basin without adequate pretreatment, and winter salting will increase the potential <br />for the chloride contamination of groundwater. <br />If infiltration practices are used as a stand - alone, all -season water quality treatment facility, then oversizing (to <br />account for reduced infiltration rates) and/or extended pretreatment should be considered. Doubling the storage <br />volume for surface infiltration devices is recommended. Redundant pretreatment (more than one pretreatment <br />device in series) is recommended for all infiltration facilities receiving runoff from roads. <br />Another option is the use of a seasonally operated facility (Oberts, 1994). A seasonally operated infiltration basin <br />combines several techniques to improve the performance of infiltration practices in cold climates. Two features —an <br />underdrain system and level control valves —are useful in cold climates. In the beginning of the winter season, <br />the level - control valve is opened and the soil is drained. As the snow begins to melt in the spring, the underdrain <br />and the level - control valves are closed. The snowmelt is infiltrated until the capacity of the soil is reached. Then <br />the facility acts as a detention facility, providing storage for particles to settle. <br />Infiltration Basins Plant List <br />Source: Fred Rozumalski <br />Mesic -Dry Soils (Sunny) <br />Native <br />Butterfly Flower <br />Purple Prairie Clover <br />Purple Coneflower <br />Bee balm <br />Little Bluestem <br />Spiderwort <br />Asclepias tuberosa <br />Dalea purpureum <br />Echinacea purpurea <br />Monarda fistulosa <br />Schizachyrium scoparium <br />Tradescantia bracteata <br />Mesic -Dry Soils (Shady) <br />Native <br />Wild Columbine <br />Wild Geranium <br />Obedient Plant <br />Jacob's Ladder <br />Solomon's Seal <br />Zig Zag Goldenrod <br />Canada Violet <br />Culver's Root <br />Aquilegia canadensis <br />Geranium maculatum <br />Physostegia virginiana <br />Polemonium reptans <br />Polygonatum b ?orum <br />Solidago flexicaulis <br />Viola canadensis <br />Veronicastrum virginium <br />Non - Native <br />Yarrow "Coronation Gold" <br />Feather Reed Grass "Karl Foerster" <br />Daylily <br />Blazingstar "Kobold" <br />Silverfeather Grass <br />Garden Phlox <br />Black -Eyed Susan "Goldsturm" <br />Non - Native <br />White Comfrey <br />Tufted Hair Grass <br />Bigroot Geranium <br />Daylily <br />Hosta "Royal Standard" <br />Tigerlily <br />Achillea "Coronation Gold" <br />Calamogrostis "Karl Foerster" <br />Hemerocallis spp. <br />Liatris "Kobold" <br />Miscanthus sinensis <br />Phlox paniculata <br />Rudbeckia fulgida " Goldsturm" <br />Symphytum grandiflorum <br />Deschamsia caespitosa <br />Geranium macrorrhizum <br />Hemerocallis spp. <br />Hosta "Royal Standard" <br />Lilium tigrinum <br />3-164 Minnesota Urban Small Sites BMP Manual <br />