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Below is a summary of requirements, recommendations and other information for using the Minimal Impacts Design Standards (MIDS) calculator for bioretention BMPs. Links to MIDS pages and the MIDS calculator are included at the bottom of this page. | Below is a summary of requirements, recommendations and other information for using the Minimal Impacts Design Standards (MIDS) calculator for bioretention BMPs. Links to MIDS pages and the MIDS calculator are included at the bottom of this page. | ||
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+ | ==Overview== | ||
+ | [[File:Bioinfiltration MIDS.png|300px|thumb|alt=image for bioinfiltration used in MIDS calculator|Symbol used for bioinfiltration used in MIDS calculator<font zixe=3></font size>]] | ||
+ | [[File:Biofiltration.png|300px|thumb|alt=image for biofiltration (bioretention with underdrain) used in MIDS calculator|Symbol used for biofiltration (bioretention with underdrain) used in MIDS calculator<font zixe=3></font size>]] | ||
+ | The MIDS calculator includes bioinfiltration (bioretention with no underdrain) and biofiltration (bioretention with an underdrain) as BMP options. The user must input the impervious cover acreage draining to the BMP. | ||
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+ | For bioinfiltration systems, the user must input the overflow surface area (the area of the BMP at the point where overflow occurs), the surface area of the bottom of the basin, and the depth of the basin (the depth between the overflow surface area and the bottom surface area). The volume that can be stored in the basin is equal to the basin depth times the average surface area of the basin ((overflow area + bottom surface area)divided by 2). Water is assumed to be instantaneously delivered to the basin. In reality, water would be infiltrating as the basin fills. The total volume infiltrated is thus underestimated. The user must also input the underlying soil type (HSG A, B, C, or D) and the time required for drawdown (48 hours or in the case of trout streams, 24 hours). | ||
==Requirements== | ==Requirements== | ||
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*[[Requirements, recommendations and information for using bioretention BMPs in the MIDS calculator]]</noinclude> | *[[Requirements, recommendations and information for using bioretention BMPs in the MIDS calculator]]</noinclude> | ||
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[[Category:MIDS calculator requirements]] | [[Category:MIDS calculator requirements]] |
Below is a summary of requirements, recommendations and other information for using the Minimal Impacts Design Standards (MIDS) calculator for bioretention BMPs. Links to MIDS pages and the MIDS calculator are included at the bottom of this page.
The MIDS calculator includes bioinfiltration (bioretention with no underdrain) and biofiltration (bioretention with an underdrain) as BMP options. The user must input the impervious cover acreage draining to the BMP.
For bioinfiltration systems, the user must input the overflow surface area (the area of the BMP at the point where overflow occurs), the surface area of the bottom of the basin, and the depth of the basin (the depth between the overflow surface area and the bottom surface area). The volume that can be stored in the basin is equal to the basin depth times the average surface area of the basin ((overflow area + bottom surface area)divided by 2). Water is assumed to be instantaneously delivered to the basin. In reality, water would be infiltrating as the basin fills. The total volume infiltrated is thus underestimated. The user must also input the underlying soil type (HSG A, B, C, or D) and the time required for drawdown (48 hours or in the case of trout streams, 24 hours).