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**Can have a <span title="A convential roof is a standard roof with an impervious surface, such as an asphalt roof"> '''conventional roof'''</span> draining to a <span title="Green roofs consist of a series of layers that create an environment suitable for plant growth without damaging the underlying roof system. Green roofs create green space for public benefit, energy efficiency, and stormwater retention/ detention."> '''green roof'''</span>, but the conventional roof area must be less than or equal to the green roof area. | **Can have a <span title="A convential roof is a standard roof with an impervious surface, such as an asphalt roof"> '''conventional roof'''</span> draining to a <span title="Green roofs consist of a series of layers that create an environment suitable for plant growth without damaging the underlying roof system. Green roofs create green space for public benefit, energy efficiency, and stormwater retention/ detention."> '''green roof'''</span>, but the conventional roof area must be less than or equal to the green roof area. | ||
**If the entire area is green roof (no conventional roof), then it is relatively easy to meet the volume retention requirement | **If the entire area is green roof (no conventional roof), then it is relatively easy to meet the volume retention requirement | ||
− | **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> depth is restricted to 4 inches <span title="an extensive green roof has growing medium that is 6 inches or less deep"> '''(extensive roofs)'''</span>. | + | **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> depth is no longer restricted to 4 inches <span title="an extensive green roof has growing medium that is 6 inches or less deep"> '''(extensive roofs)'''</span>. However, if you make the media thickness greater than 4 inches, you get a popup reminding you that you are designing an <span title="an intensive green roof has growing medium that is 6 inches or more deep"> '''intensive roof'''</span>. For most green roofs, a media thickness of 4 inches will be sufficient to meet the volume requirement. |
*Volume retention | *Volume retention | ||
**Maximize media depth to increase retention | **Maximize media depth to increase retention | ||
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*Applicability | *Applicability | ||
**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 <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> that can be incorporated into many landscapes; provides multiple benefits (e.g. habitat, aesthetics) |
**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 | **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 | ||
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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 <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> on highly permeable (A) soils. Less effective on B soils due to cost of construction and maintenance. |
**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> | **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 | ||
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*Applicability | *Applicability | ||
− | **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> | + | **This is a good <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> 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 <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> | + | **This is a good <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> 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 | ||
− | *Swale side slope and swale main channel (with or without underdrain) act as a single BMP. Make sure impervious and pervious acres are applied to the side slope and not the main channel, unless water is routed directly to a main channel. Swale lengths for side slopes and main channel should be the same for a swale system | + | *Swale side slope and swale main channel (with or without underdrain) act as a single <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span>. Make sure impervious and pervious acres are applied to the side slope and not the main channel, unless water is routed directly to a main channel. Swale lengths for side slopes and main channel should be the same for a swale system |
**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 | ||
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*Applicability | *Applicability | ||
− | **It is difficult to meet the retention requirement with this BMP | + | **It is difficult to meet the retention requirement with this <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> |
**Useful on <span title="low permeability soils typically have low infiltration rates, less than 0.1 inches per hour. These are Hydrologic Soil Group D soils"> '''low permeability soils'''</span> for reducing the volume delivered to downstream BMPs | **Useful on <span title="low permeability soils typically have low infiltration rates, less than 0.1 inches per hour. These are Hydrologic Soil Group D soils"> '''low permeability soils'''</span> for reducing the volume delivered to downstream BMPs | ||
**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 | **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 | ||
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*Applicability | *Applicability | ||
**Cannot be used to meet the Construction Stormwater permit volume retention requirement | **Cannot be used to meet the Construction Stormwater permit volume retention requirement | ||
− | **It is difficult to meet the retention requirement with this BMP | + | **It is difficult to meet the retention requirement with this <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMP'''</span> |
**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 | ||
**Limited by the area that can effectively infiltrate water (see diagram on BMP Parameters tab for this BMP in the calculator) | **Limited by the area that can effectively infiltrate water (see diagram on BMP Parameters tab for this BMP in the calculator) | ||
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==Wet swale, sand filter, constructed wetland, and constructed pond== | ==Wet swale, sand filter, constructed wetland, and constructed pond== | ||
− | These BMPs do not reduce volume | + | These <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMPs'''</span> do not reduce volume |
==Summary table== | ==Summary table== | ||
− | The following table provides some summary information for BMPs in the MIDS calculator. Several cells show a range of values. These are explained below. | + | The following table provides some summary information for <span title="one of many different structural or non–structural methods used to treat runoff"> '''BMPs'''</span> in the MIDS calculator. Several cells show a range of values. These are explained below. |
*Bioretention without underdrain, because of the depth limitation, has moderate retention capacity on A soils compared to other infiltration practices which can be built deeper to infiltrate more water | *Bioretention without underdrain, because of the depth limitation, has moderate retention capacity on A soils compared to other infiltration practices which can be built deeper to infiltrate more water | ||
*Swale main channel has low infiltration capacity on low permeability soils, but high capacity on A soils when check dams are used | *Swale main channel has low infiltration capacity on low permeability soils, but high capacity on A soils when check dams are used | ||
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| Stormwater disconnection || Moderate || Moderate || No || Limited | | Stormwater disconnection || Moderate || Moderate || No || Limited | ||
|} | |} | ||
+ | |||
+ | [[Category:Level 3 - Models and modeling/Specific models/MIDS Calculator]] |
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 |
This page was last edited on 1 December 2022, at 20:16.