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**Limited to 1.5 foot ponding depth | **Limited to 1.5 foot ponding depth | ||
**Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | **Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | ||
− | **Not effective in highly urban and ultra-urban environments because of required space | + | **Not effective in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> because of required space |
*Volume retention | *Volume retention | ||
**Typically, you will want to maximize depth and limit surface area unless you are designing for other benefits, such as habitat | **Typically, you will want to maximize depth and limit surface area unless you are designing for other benefits, such as habitat | ||
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*Applicability | *Applicability | ||
**More effective than bioinfiltration because depth is only limited by drawdown time requirement | **More effective than bioinfiltration because depth is only limited by drawdown time requirement | ||
− | **Not as effective as underground systems in highly urban and ultra-urban environments | + | **Not as effective as underground systems in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
**May have limited ability to remove pollutants on highly permeable (A) soils | **May have limited ability to remove pollutants on highly permeable (A) soils | ||
*Volume retention | *Volume retention | ||
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*Applicability | *Applicability | ||
**A very effective BMP on highly permeable (A) soils. Less effective on B soils due to cost of construction and maintenance. | **A very effective BMP on highly permeable (A) soils. Less effective on B soils due to cost of construction and maintenance. | ||
− | **Effective in highly urban and ultra-urban | + | **Effective in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
**Can be difficult to make calculations and use the calculator to size the practice since calculations are made outside the calculator, unless you have specifications from the manufacturer | **Can be difficult to make calculations and use the calculator to size the practice since calculations are made outside the calculator, unless you have specifications from the manufacturer | ||
*Volume retention | *Volume retention | ||
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*Applicability | *Applicability | ||
**Very effective at reducing volume | **Very effective at reducing volume | ||
− | **Effective in highly urban and ultra-urban | + | **Effective in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
**Limited to 5:1 ratio for impervious:permeable pavement area (Note: permeable pavement is included in impermeable acreage in the calculator) | **Limited to 5:1 ratio for impervious:permeable pavement area (Note: permeable pavement is included in impermeable acreage in the calculator) | ||
**Should not route pervious runoff to permeable pavement and should limit impervious:pavement ratio to 2:1 due to maintenance needs | **Should not route pervious runoff to permeable pavement and should limit impervious:pavement ratio to 2:1 due to maintenance needs | ||
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*Applicability | *Applicability | ||
− | **This is a good BMP in highly urban and ultra-urban | + | **This is a good BMP in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
**Water is stored in the <span title="Engineered media is a mixture of sand, fines (silt, clay), and organic matter utilized in stormwater practices, most frequently in bioretention practices. The media is typically designed to have a rapid infiltration rate, attenuate pollutants, and allow for plant growth."> [https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_bioretention#Materials_specifications_-_filter_media '''media''']</span> instead of being ponded. Thus, the amount of water stored is less than bioinfiltration or infiltration basin per unit volume because solids are taking up some of the available storage space | **Water is stored in the <span title="Engineered media is a mixture of sand, fines (silt, clay), and organic matter utilized in stormwater practices, most frequently in bioretention practices. The media is typically designed to have a rapid infiltration rate, attenuate pollutants, and allow for plant growth."> [https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_bioretention#Materials_specifications_-_filter_media '''media''']</span> instead of being ponded. Thus, the amount of water stored is less than bioinfiltration or infiltration basin per unit volume because solids are taking up some of the available storage space | ||
**Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | **Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | ||
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*Applicability | *Applicability | ||
− | **This is a good BMP in highly urban and ultra-urban | + | **This is a good BMP in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
**Water is stored in the <span title="Engineered media is a mixture of sand, fines (silt, clay), and organic matter utilized in stormwater practices, most frequently in bioretention practices. The media is typically designed to have a rapid infiltration rate, attenuate pollutants, and allow for plant growth."> [https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_bioretention#Materials_specifications_-_filter_media '''media''']</span> instead of being ponded. Thus, the amount of water stored is less than bioinfiltration or infiltration basin per unit volume because solids are taking up some of the available storage space | **Water is stored in the <span title="Engineered media is a mixture of sand, fines (silt, clay), and organic matter utilized in stormwater practices, most frequently in bioretention practices. The media is typically designed to have a rapid infiltration rate, attenuate pollutants, and allow for plant growth."> [https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_bioretention#Materials_specifications_-_filter_media '''media''']</span> instead of being ponded. Thus, the amount of water stored is less than bioinfiltration or infiltration basin per unit volume because solids are taking up some of the available storage space | ||
**Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | **Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | ||
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**Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | **Diverse BMP that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) | ||
**Not a good volume retention practice unless on A soils and/or designed with check dams or bioretention base | **Not a good volume retention practice unless on A soils and/or designed with check dams or bioretention base | ||
− | **Not good for highly urban and ultra-urban | + | **Not good for <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> |
*Volume retention | *Volume retention | ||
**Increase swale length to maximize volume retention | **Increase swale length to maximize volume retention | ||
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**It is difficult to meet the retention requirement with this BMP | **It is difficult to meet the retention requirement with this BMP | ||
**Useful on low permeability soils for reducing the volume delivered to downstream BMPs | **Useful on low permeability soils for reducing the volume delivered to downstream BMPs | ||
− | **Can be used in ultra-urban | + | **Can be used in <span title="Highly urban and ultra-urban settings have a large percentage of impermeable surface and typically have limited space to install surface BMPs. An example would be a downtown area."> '''highly urban and ultra-urban environments'''</span> where there are small green spaces to irrigate |
**Most effective when there are large green spaces that can be irrigated | **Most effective when there are large green spaces that can be irrigated | ||
*Volume retention | *Volume retention |
This page provides information and recommendations for maximizing volume retention in the MIDS calculator.
Link to infiltration basin/trench
Link to infiltration basin/trench
Link to information on tree trenches
Link to information on tree trenches
Link to information on stormwater harvest and reuse
Link to information on stormwater impervious disconnection
These BMPs do not reduce volume
The following table provides some summary information for BMPs in the MIDS calculator. Several cells show a range of values. These are explained below.
BMP | Volume reduction capacity (total) | Volume reduction capacity (per unit BMP area) | Ultra-urban applicability | Multiple benefit applicability |
---|---|---|---|---|
Green roof | Low | High | Yes | Yes |
Bioretention w/o underdrain | Moderate | Moderate-high | No | Yes |
Bioretention w/underdrain | Low | Low | No | Yes |
Infiltration basin/trench | High | High | No | Limited |
Underground infiltration | High | High | Yes | Limited |
Permeable pavement | Low | High | Yes | Limited |
Tree trench w/o underdrain | Moderate-high | High | Yes | Yes |
Tree trench w/underdrain | Low-moderate | Low | Yes | Yes |
Swale main channel | Low-high | Low-high | No | Yes |
Swale main channel w/ underdrain | Low | Low | No | Yes |
Harvest and reuse/cistern | Moderate | Moderate | Yes | Limited |
Stormwater disconnection | Moderate | Moderate | No | Limited |