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− | This page provides guidance related to assessing the [https://stormwater.pca.state.mn.us/index.php?title=Total_Suspended_Solids_(TSS)_in_stormwater total suspended sediment] (TSS) and [https://stormwater.pca.state.mn.us/index.php?title=Phosphorus 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. | + | This page provides guidance related to assessing the [https://stormwater.pca.state.mn.us/index.php?title=Total_Suspended_Solids_(TSS)_in_stormwater total suspended sediment] (TSS) and [https://stormwater.pca.state.mn.us/index.php?title=Phosphorus total phosphorus] (TP) removal efficiency of permittee owned/operated [https://stormwater.pca.state.mn.us/index.php?title=Stormwater_ponds 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 | + | 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 [https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_stormwater_ponds#Physical_feasibility_initial_check sized correctly] for their contributing drainage area and that pond inspection and [https://stormwater.pca.state.mn.us/index.php?title=Assessing_the_performance_of_stormwater_ponds assessments] be performed routinely to monitor sedimentation and identify potential [https://stormwater.pca.state.mn.us/index.php?title=Operation_and_maintenance_of_stormwater_ponds 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. |
− | maintenance needs | ||
− | Guidance presented in | + | Guidance presented will assist <span title="A municipal separate storm sewer system (MS4) is a means of transportation, individually or in a system, (e.g. roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, storm drains, etc.) that are: owned or operated by a public entity (e.g. cities, townships, counties, military bases, hospitals, prison complexes, highway departments, universities, etc.) with jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes. This includes special districts under State law (sewer, flood control, or drainage districts, etc.), an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the Clean Water Act; designed or used for collecting or transporting stormwater; not a combined sewer; and not part of a publicly owned treatment works."> '''MS4s'''</span> (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. |
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+ | [[TSS and TP Removal Efficiency Evaluation Strategies]] | ||
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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.
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
A tour of the Minnesota Stormwater Manual content