(Created page with "<table class="sortable"> <tr> <th>Process</th> <th>BMP</th> <th>Comments</th> </tr> <tr> <th rowspan="6"> Infiltration</th> <td>Low impact development/better site design/susta...")
 
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{{alert|Note the following table provides general information about volume reduction. It is not intended for determining Construction Stormwater permit compliance, although the table includes a column discussing the applicability of the practice to permit compliance.|alert-danger}}
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<font size=3>'''Summary of volume reduction processes and BMPs associated with each process. Comments include qualifications and examples for the BMPs. Note that some BMPs occur in more than one process.'''</font size><br>
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Link to this [[Volume reduction practices|table]]
 
<table class="sortable">
 
<table class="sortable">
 
<tr>
 
<tr>
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<th>BMP</th>
 
<th>BMP</th>
 
<th>Comments</th>
 
<th>Comments</th>
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<th>Used for [https://stormwater.pca.state.mn.us/index.php?title=Construction_stormwater_program CSW permit] compliance?</th>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<th rowspan="6"> Infiltration</th>
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<td rowspan="6"> Infiltration</td>
 
<td>Low impact development/better site design/sustainable development</td>
 
<td>Low impact development/better site design/sustainable development</td>
 
<td>Includes such things as reduced street and sidewalk width, less curb and gutter drainage, scattered bioretention, shared pavement.</td>
 
<td>Includes such things as reduced street and sidewalk width, less curb and gutter drainage, scattered bioretention, shared pavement.</td>
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<td>Yes if water is retained on site, typically through [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices infiltration]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Trench or basin</td>
 
<td>Trench or basin</td>
 
<td>Must be properly engineered in adequate soils; proper maintenance essential</td>
 
<td>Must be properly engineered in adequate soils; proper maintenance essential</td>
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<td>Yes [https://stormwater.pca.state.mn.us/index.php?title=Infiltration]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Perforated sub-surface pipes, tanks and storage systems</td>
 
<td>Perforated sub-surface pipes, tanks and storage systems</td>
 
<td>Expensive but effective and space-saving.</td>
 
<td>Expensive but effective and space-saving.</td>
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<td>If part of an [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices infiltration stormwater practice]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Disconnected imperviousness</td>
 
<td>Disconnected imperviousness</td>
 
<td>Includes primarily rooftop drains and roadway/parking surfaces</td>
 
<td>Includes primarily rooftop drains and roadway/parking surfaces</td>
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<td>By itself, disconnection does not meet CSW permit requirements. Runoff must be diverted to an [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices infiltration stormwater practice]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Pervious (porous pavement)</td>
 
<td>Pervious (porous pavement)</td>
 
<td>Includes a number of paving and block methods, or simple parking on reinforced grassed surfaces.</td>
 
<td>Includes a number of paving and block methods, or simple parking on reinforced grassed surfaces.</td>
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<td>Yes [https://stormwater.pca.state.mn.us/index.php?title=Permeable_pavement]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Bioretention (if contains infiltration element)</td>
 
<td>Bioretention (if contains infiltration element)</td>
 
<td>Some bioretention facilities are designed to infiltrate.</td>
 
<td>Some bioretention facilities are designed to infiltrate.</td>
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<td>Yes if bioinfiltration. Biofiltration practices may achieve some volume reduction that can be credited toward permit compliance. [https://stormwater.pca.state.mn.us/index.php?title=Bioretention]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<th rowspan="5">Evapotranspiration</th>
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<td rowspan="5">Evapotranspiration</td>
 
<td>Bioretention (rain gardens)</td>
 
<td>Bioretention (rain gardens)</td>
 
<td>Exposes runoff water to plant roots for uptake;can be under-drained and still effective.</td>
 
<td>Exposes runoff water to plant roots for uptake;can be under-drained and still effective.</td>
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<td>Vegetated swales</td>
 
<td>Vegetated swales</td>
 
<td>Provides water a chance to soak into the ground and be filtered as it flows.</td>
 
<td>Provides water a chance to soak into the ground and be filtered as it flows.</td>
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<td>Yes, though swales typically achieve limited volume reduction unless designed with check dams and/or occurring on permeable soils [https://stormwater.pca.state.mn.us/index.php?title=Dry_swale_(Grass_swale)]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Wetland/pond storage</td>
 
<td>Wetland/pond storage</td>
 
<td>Combination of standing water surface and vegetative root exposure yields volume reductions.</td>
 
<td>Combination of standing water surface and vegetative root exposure yields volume reductions.</td>
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<td>No</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Vegetated drainage corridor</td>
 
<td>Vegetated drainage corridor</td>
 
<td>Connecting numerous features increases opportunities.</td>
 
<td>Connecting numerous features increases opportunities.</td>
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<td>No</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Recessed road/parking drainage</td>
 
<td>Recessed road/parking drainage</td>
 
<td>Routing paved surface runoff to vegetated sump areas keeps it out of receiving waters.</td>
 
<td>Routing paved surface runoff to vegetated sump areas keeps it out of receiving waters.</td>
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<td>No, unless part of an [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices infiltration practice]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<th rowspan="3">Storage</th>
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<td rowspan="2">Storage</td>
 
<td>Rain barrel/cistern</td>
 
<td>Rain barrel/cistern</td>
 
<td>Small-scale runoff collectors keep water around for later re-use or slow release.</td>
 
<td>Small-scale runoff collectors keep water around for later re-use or slow release.</td>
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<td>Yes if captured water is infiltrated or otherwise used on site</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Rooftop (green roof)</td>
 
<td>Rooftop (green roof)</td>
 
<td>Storage on a roof prevents water from leaving the site; combining with vegetation (engineered green roof) makes it even better.</td>
 
<td>Storage on a roof prevents water from leaving the site; combining with vegetation (engineered green roof) makes it even better.</td>
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<td>Yes if captured water is retained on site (typically through evapotranspiration)</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Wetland/pond storage</td>
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<td rowspan="2">Conveyance</td>
<td>Combination of standing water surface and vegetative root exposure yields dramatic volume reductions.</td>
 
</tr>
 
<th rowspan="2">Conveyance</th>
 
 
<td>Vegetated swale</td>
 
<td>Vegetated swale</td>
 
<td>Provides water a chance to soak into the ground and be filtered as it flows.</td>
 
<td>Provides water a chance to soak into the ground and be filtered as it flows.</td>
 +
<td>Yes, though swales typically achieve limited volume reduction unless designed with check dams and/or occurring on permeable soils [https://stormwater.pca.state.mn.us/index.php?title=Dry_swale_(Grass_swale)]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Filter strips/buffers</td>
 
<td>Filter strips/buffers</td>
 
<td>Variation of vegetated swale with side slope protection.</td>
 
<td>Variation of vegetated swale with side slope protection.</td>
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<td>No</td>
 
</tr>
 
</tr>
<th rowspan="2">Landscaping</th>
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<tr>
 +
<td rowspan="2">Landscaping</td>
 
<td>Low Impact Development/Better Site Design</td>
 
<td>Low Impact Development/Better Site Design</td>
 
<td>Includes such things as scattered bioretention, shared pavement, native or prairie plantings.</td>
 
<td>Includes such things as scattered bioretention, shared pavement, native or prairie plantings.</td>
 +
<td>Yes if water is retained on site, typically through [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices infiltration]</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td>Bioretention (rain gardens)</td>
 
<td>Bioretention (rain gardens)</td>
 
<td>Exposes runoff water to plant roots for uptake, can be under-drained and still effective.</td>
 
<td>Exposes runoff water to plant roots for uptake, can be under-drained and still effective.</td>
 +
<td>Yes if bioinfiltration. Biofiltration practices may achieve some volume reduction that can be credited toward permit compliance. [https://stormwater.pca.state.mn.us/index.php?title=Bioretention]</td>
 
</tr>
 
</tr>
 
</table>
 
</table>
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<noinclude>
 +
[[Category:Level 3 - General information, reference, tables, images, and archives/Tables/Hydrology and geology‏‎]]
 +
[[Category:Level 3 - General information, reference, tables, images, and archives/Tables/General bmp information]]
 +
</noinclude>

Latest revision as of 12:20, 7 August 2022

Warning: Note the following table provides general information about volume reduction. It is not intended for determining Construction Stormwater permit compliance, although the table includes a column discussing the applicability of the practice to permit compliance.

Summary of volume reduction processes and BMPs associated with each process. Comments include qualifications and examples for the BMPs. Note that some BMPs occur in more than one process.
Link to this table

Process BMP Comments Used for CSW permit compliance?
Infiltration Low impact development/better site design/sustainable development Includes such things as reduced street and sidewalk width, less curb and gutter drainage, scattered bioretention, shared pavement. Yes if water is retained on site, typically through infiltration
Trench or basin Must be properly engineered in adequate soils; proper maintenance essential Yes [1]
Perforated sub-surface pipes, tanks and storage systems Expensive but effective and space-saving. If part of an infiltration stormwater practice
Disconnected imperviousness Includes primarily rooftop drains and roadway/parking surfaces By itself, disconnection does not meet CSW permit requirements. Runoff must be diverted to an infiltration stormwater practice
Pervious (porous pavement) Includes a number of paving and block methods, or simple parking on reinforced grassed surfaces. Yes [2]
Bioretention (if contains infiltration element) Some bioretention facilities are designed to infiltrate. Yes if bioinfiltration. Biofiltration practices may achieve some volume reduction that can be credited toward permit compliance. [3]
Evapotranspiration Bioretention (rain gardens) Exposes runoff water to plant roots for uptake;can be under-drained and still effective.
Vegetated swales Provides water a chance to soak into the ground and be filtered as it flows. Yes, though swales typically achieve limited volume reduction unless designed with check dams and/or occurring on permeable soils [4]
Wetland/pond storage Combination of standing water surface and vegetative root exposure yields volume reductions. No
Vegetated drainage corridor Connecting numerous features increases opportunities. No
Recessed road/parking drainage Routing paved surface runoff to vegetated sump areas keeps it out of receiving waters. No, unless part of an infiltration practice
Storage Rain barrel/cistern Small-scale runoff collectors keep water around for later re-use or slow release. Yes if captured water is infiltrated or otherwise used on site
Rooftop (green roof) Storage on a roof prevents water from leaving the site; combining with vegetation (engineered green roof) makes it even better. Yes if captured water is retained on site (typically through evapotranspiration)
Conveyance Vegetated swale Provides water a chance to soak into the ground and be filtered as it flows. Yes, though swales typically achieve limited volume reduction unless designed with check dams and/or occurring on permeable soils [5]
Filter strips/buffers Variation of vegetated swale with side slope protection. No
Landscaping Low Impact Development/Better Site Design Includes such things as scattered bioretention, shared pavement, native or prairie plantings. Yes if water is retained on site, typically through infiltration
Bioretention (rain gardens) Exposes runoff water to plant roots for uptake, can be under-drained and still effective. Yes if bioinfiltration. Biofiltration practices may achieve some volume reduction that can be credited toward permit compliance. [6]

This page was last edited on 7 August 2022, at 12:20.