Difference between revisions of "BMP pollutant removal for phosphorus"
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| − | <font size=2><sup>a</sup> <p>Removal rates show in table are a composite of five sources: | + | <font size=2><sup>a</sup> <p>Removal rates show in table are a composite of five sources: </p> |
| − | + | *Caraco (Center for Watershed protection, 2001) | |
| − | + | *Maryland Department of the Environment](2000) | |
| − | + | *Winer (Center for Watershed Protection, 2000) | |
| − | + | *P8 modeling (William Walker) | |
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<sup>b</sup> Average removal efficiency expected under MPCA Sizing Rules 1 and 3<br> | <sup>b</sup> Average removal efficiency expected under MPCA Sizing Rules 1 and 3<br> | ||
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<sup>f</sup> Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that bypasses the BMP<br> | <sup>f</sup> Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that bypasses the BMP<br> | ||
<sup>g</sup>Note that soluble P can transfer from surface water to groundwater, but this column refers only to surface water<br> | <sup>g</sup>Note that soluble P can transfer from surface water to groundwater, but this column refers only to surface water<br> | ||
| − | <sup>h</sup>Note that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment.</font size> | + | <sup>h</sup><p>Note that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment.</font size></p> |
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[[category:table]] | [[category:table]] | ||
Revision as of 20:41, 14 February 2013
Link to this table
Information: Removal rates shown here are composite averages intended solely for use in comparing performance between BMP designs and for use in calculating load reduction in site-based TP models. They have been adapted, rounded and slightly discounted from statistical values published in BMP performance databases.
| BMP group | BMP design variation | Average TP removal rateb | Maximum TP removal ratec | Average soluble P removal rated,g |
|---|---|---|---|---|
| Bioretention | Underdrain | 65 | 75 | 60 |
| Infiltration | 100 | 100 | 100 | |
| Filtration | Sand filter | 50 | 55 | 0 |
| Dry swale | 0 | 55 | 0 | |
| Wet swale | 65 | 75 | 70 | |
| Infiltrationf | Infiltration trench | 100 | 100 | 100 |
| Infiltration basin | 100 | 100 | 100 | |
| Stormwater ponds | Wet pond | 50 | 65 | 70 |
| Multiple pond | 60 | 75 | 75 | |
| Stormwater wetlands | Shallow wetland | 40 | 55 | 50 |
| Pond/wetland | 55 | 75 | 65 |
a
Removal rates show in table are a composite of five sources:
- Caraco (Center for Watershed protection, 2001)
- Maryland Department of the Environment](2000)
- Winer (Center for Watershed Protection, 2000)
- P8 modeling (William Walker)
b Average removal efficiency expected under MPCA Sizing Rules 1 and 3
c Upper limit on phosphorus removal with increased sizing and design features, based on national review
d Average rate of soluble phosphorus removal in the literature
e See section on calculating credits for each BMP in this Manual.
f Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that bypasses the BMP
gNote that soluble P can transfer from surface water to groundwater, but this column refers only to surface water
h
Note that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment.