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{{alert|This page is an edit and testing page use by the wiki authors.  It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}}
 
{{alert|This page is an edit and testing page use by the wiki authors.  It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}}
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==Phosphorus quiz==
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#Dissolved phosphorus is about how many times more bioavailable than particulate phosphorus? 1, 5, 20 <font red>5. Dissolved P is about 90 percent bioavailable, compared to about 20% for particulate P</font>
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#Median concentrations of total phosphorus in stormwater are about how many times greater than water quality standards? 1, 3, 10
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#True or false: Most phosphorus in stormwater runoff is in dissolved forms.
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#Which of these is a more important source of dissolved phosphorus: sediment or organic material (e.g. leaves).
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#Street sweeping for phosphorus would be more effective in which of these: downtown Minneapolis, a high canopy area in St. Paul, a new development in Maple Grove
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#Reasons why stormwater ponds export phosphorus include which of the following (select all that apply): turn over too frequently, turn over too infrequently, oxygen exists in the hypolimnion, inadequate maintenance, excess organic material entering the pond, excess canopy cover adjacent to pond prevents mixing
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#True or false: Biochar is effective at absorbing phosphorus
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#At about what % compost will bioretention media begin to leach phosphorus: 5, 10, 20
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#True or false: Infiltration of stormwater runoff is an excellent metod for reducing phosphorus loading to surface water
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#True or false: in residential areas, runoff from surfaces considered to be permeable is an important source of dissolved phosphorus
  
 
==a==
 
==a==

Revision as of 14:42, 19 October 2020

Warning: This page is an edit and testing page use by the wiki authors. It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.

Phosphorus quiz

  1. Dissolved phosphorus is about how many times more bioavailable than particulate phosphorus? 1, 5, 20 5. Dissolved P is about 90 percent bioavailable, compared to about 20% for particulate P
  2. Median concentrations of total phosphorus in stormwater are about how many times greater than water quality standards? 1, 3, 10
  3. True or false: Most phosphorus in stormwater runoff is in dissolved forms.
  4. Which of these is a more important source of dissolved phosphorus: sediment or organic material (e.g. leaves).
  5. Street sweeping for phosphorus would be more effective in which of these: downtown Minneapolis, a high canopy area in St. Paul, a new development in Maple Grove
  6. Reasons why stormwater ponds export phosphorus include which of the following (select all that apply): turn over too frequently, turn over too infrequently, oxygen exists in the hypolimnion, inadequate maintenance, excess organic material entering the pond, excess canopy cover adjacent to pond prevents mixing
  7. True or false: Biochar is effective at absorbing phosphorus
  8. At about what % compost will bioretention media begin to leach phosphorus: 5, 10, 20
  9. True or false: Infiltration of stormwater runoff is an excellent metod for reducing phosphorus loading to surface water
  10. True or false: in residential areas, runoff from surfaces considered to be permeable is an important source of dissolved phosphorus

a

This page provides guidance related to assessing the total suspended sediment (TSS) and total phosphorus (TP) removal efficiency of permittee owned/operated ponds constructed and used for the collection and treatment of stormwater. Four (4) evaluation strategies are discussed.

  • Evaluation of Minnesota Pollution Control Agency (MPCA) stormwater pond design criteria
  • Stormwater pond inspection/assessment
  • Stormwater pond pollutant removal modeling
  • Stormwater pond water quality monitoring

The TSS and TP removal efficiency of constructed stormwater ponds degrades over time due to the loss of storage volume to sedimentation and/or sediment phosphorus release. For this reason, it is critical that stormwater ponds be sized correctly for their contributing drainage area and that pond inspection and assessments be performed routinely to monitor sedimentation and identify potential maintenance needs. In addition to evaluating pollutant removal efficiency through comparison to design standards and evaluation of sedimentation, the water quality performance of stormwater ponds can be evaluated using various water quality modeling programs or measured directly through water quality monitoring.

Guidance presented will assist MS4s (Municipal Separate Storm Sewer System) evaluate the TSS and TP treatment effectiveness of ponds post-construction and over their design life. The adjacent table provides a summary of the four (4) TSS and TP removal efficiency evaluation strategies discussed within this memorandum.

TSS and TP Removal Efficiency Evaluation Strategies

b

c

d

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