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Lino Lakes City Hall - Infiltration trench Bradshaw Celebration of Life Center <br />Lino Lakes, MN - underground storage & infiltration <br />Stillwater. MN <br />Design Criteria: <br />► Contributing drainage area <br />► Underlying soil types <br />► Depth to the water table, bedrock or other <br />impeding layer <br />► Proximity to buildings, drinking water supplies, <br />karst features, etc... <br />► Source of stormwater runoff <br />Benefits: <br />► Reduces volume of stormwater runoff <br />► Increases groundwater recharge <br />► Improves surface water quality <br />► Provides thermal benefits (e.g, to cold water <br />fisheries) <br />► Mimics pre -development hydrology <br />Limitations: <br />► Unusual construction considerations <br />► Potential for groundwater contamination <br />► Tendency to lose effectiveness over time due <br />to clogging — if not properly constructed or <br />maintained <br />► Not recommended for areas with steep <br />slopes <br />► May require landscaping: consideration <br />should be given to periods on inundation and <br />drought <br />Water Quality (V,,) <br />Channel Protection (V CO <br />Overbank Flood Protection (V Pro) <br />Extreme Flood Protection (V P100) <br />Recharge Volume (VRd <br />d <br />ri MECHANISMS <br />Infiltration <br />Screening/ Filtration <br />X Temperature Control <br />Settling <br />Evaporation <br />Transpiration • r vrg,)taied <br />Soil Adsorption <br />Biological/ Micro. Uptake <br />Total Suspended Solids <br />10, Nutrients - Total Phosphorus/ <br />" Total Nitrogen <br />q Metals - Cadmium. Copper Lead, <br />and Zinc <br />a Pathogens - Coliform. Streptococci, <br />E. Coli <br />Toxins - Chloride, Hydrocarbon, <br />Pesticide <br />1 <br />