Difference between revisions of "Minnesota Stormwater Manual test page 5"
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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. | ||
| + | • 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 (Section 2.0) and that pond inspection and assessments be performed routinely to monitor sedimentation and identify potential | ||
| + | maintenance needs (Section 3.0). 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 (Section 4.0) or measured directly through water quality monitoring (Section 5.0). | ||
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| + | Guidance presented in this technical memorandum has been developed to assist MS4s evaluate the TSS and TP treatment effectiveness of ponds post-construction and over their design life. The four (4) strategies listed above were selected based on input from and coordination with the MPCA. Throughout this document, “MS4s” refers specifically to National Pollutant Discharge Elimination System (NPDES) regulated MS4s (i.e., Phase I and Phase II MS4s required to obtain NPDES permit coverage for their stormwater discharges). Table 1 provides a summary of the four (4) TSS and TP removal efficiency evaluation strategies discussed within this memorandum. | ||
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Revision as of 19:46, 15 October 2020
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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. • 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 (Section 2.0) and that pond inspection and assessments be performed routinely to monitor sedimentation and identify potential maintenance needs (Section 3.0). 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 (Section 4.0) or measured directly through water quality monitoring (Section 5.0).
Guidance presented in this technical memorandum has been developed to assist MS4s evaluate the TSS and TP treatment effectiveness of ponds post-construction and over their design life. The four (4) strategies listed above were selected based on input from and coordination with the MPCA. Throughout this document, “MS4s” refers specifically to National Pollutant Discharge Elimination System (NPDES) regulated MS4s (i.e., Phase I and Phase II MS4s required to obtain NPDES permit coverage for their stormwater discharges). Table 1 provides a summary of the four (4) TSS and TP removal efficiency evaluation strategies discussed within this memorandum.
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A tour of the Minnesota Stormwater Manual content