Note that if underlying soils are ripped to alleviate compaction, the requirement is a 2 foot minimum between the bottom of the ripped zone and a 3 foot minimum from the bottom of the infiltration practice. there must be a minimum of 3 feet of undisturbed soil beneath the infiltration practice and the seasonally high water table or top of bedrock). Warning: A separation distance of 3 feet is REQUIRED between the bottom of the bioretention practice and the elevation of the seasonally high water table ( saturated soil) or top of bedrock (i.e.
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The following list of considerations will help in making an initial judgment as to whether or not a bioretention practice is the appropriate BMP for the site. Major design elements Physical feasibility initial checkīefore deciding to use a bioretention practice for stormwater management, it is helpful to consider several items that bear on the feasibility of using such a device at a given location. utilizing native plantings (see Plants for Stormwater Design).įor more information on design information for individual infiltration and filtration practices, link here.providing pretreatment ( REQUIRED) and.providing easy site access ( REQUIRED).Implicit in the design guidance is the fact that many design elements of infiltration and filtration systems can minimize the maintenance burden and maintain pollutant removal efficiency. Prepare operations and maintenance (O&M) planĬaution: Maintenance considerations are an important component of design Check volume, peak discharge rates and period of inundation against State, local and watershed management organization requirements Determine pretreatment volume and design pretreatment measures Size outlet structure and/or flow diversion structure, if needed 1.8.5.2 Determine site infiltration rates (for facilities with infiltration and/or recharge).1.8.5 Step 5: Determine bioretention type and size practice.1.8.4 Step 4: Compute runoff control volumes.
#BIORETENTION SYSTEM REPORTING PCSWMM VERIFICATION#
1.8.3 Step 3: Perform field verification of site suitability.1.8.2 Step 2: Confirm design criteria and applicability.1.8.1 Step 1: Make a preliminary judgment.1.7.2.1 Notes about soil phosphorus testing: applicability and interpretation.1.7.2 Addressing phosphorus leaching concerns with media mixes.
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1.7.1.1 Wisconsin peat moss replacement (Bannerman, 2013).1.7 Links to information on engineered media mixes outside Minnesota.1.5.6 Mix F: Custom Infiltration Basin Planting Soil.1.5.5 Mix E: MnDOT 3877.2 Type G 'Filter Topsoil Borrow'.1.5.3 Mix C: North Carolina State University water quality blend.1.5 Media mixes for infiltration practices or modified infiltration practices.1.4.1 Mix C: North Carolina State University water quality blend.1.4 Media mixes for filtration practices.1.3 Materials specifications - filter media.1.2.1 Physical feasibility initial check.1.1 Design phase maintenance considerations.