Extracted images: Standard Constructed Wetlands (Large-Scale GI)¶

Printed revision: January 2026.

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Mistral ID: img-0.jpeg. Extraction bundle(s): 2026_BMP_10_4_Standard_Constructed_Wetlands. Original page | Image file

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Tables on the same PDF page: Table 1

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# 10.4 STANDARD CONSTRUCTED WETLANDS

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Standard constructed wetlands are stormwater management systems designed to maximize the removal of pollutants from stormwater runoff and may be used to address the quantity impacts of land development. Flow is directed through an engineered, open marsh system where pollutants are removed through settling and vegetative uptake/filtration. The total suspended solids (TSS) removal rate is 90%.

|  N.J.A.

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# Applications

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Pursuant to N.J.A.C. 7:8-5.2(a)(2), the minimum design and performance standards for groundwater recharge, stormwater runoff quality and stormwater runoff quantity at N.J.A.C. 7:8- 5.4, 5.5 and 5.6 shall be met by incorporating green infrastructure in accordance with N.J.A.C. 7:8-5.3. Pursuant to N.J.A.C. 7:8-5.3(c), large-scale green infrastructure BMPs may only be used to satisfy the stormwater runof

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orating green infrastructure in accordance with N.J.A.C. 7:8-5.3. Pursuant to N.J.A.C. 7:8-5.3(c), large-scale green infrastructure BMPs may only be used to satisfy the stormwater runoff quantity standards.

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Standard constructed wetlands may be designed to reduce peak runoff rates when designed as an on-line system. Regardless of the design storm chosen, standard constructed wetlands must be designed for stability and capacity in accordance with the Standards for Soil Erosion and Sediment Control in New Jersey.

Only if a waiver or variance from the green infrastructure requirements of N.J.A.C. 7:8-5.3 is

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# Hooded and Reverse-Slope Outlet Structures

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- The invert of the lowest stormwater quantity control outlet must be set at or above the normal water surface elevation in on-line systems.
- Trash racks must be installed at the intake to the outlet structure. They must also be designed to avoid acting as the hydraulic control for the system, and they must meet the following criteria, as required by N.J.A.C. 7:8-5.2(i)2 and 6.2(a), and the detail on

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- An overflow grate is designed to prevent obstruction of the overflow structure. If an outlet structure has an overflow grate, the grate must comply with the following requirements:

☐ The overflow grate must be secured to the outlet structure but removable for emergencies and maintenance;
☐ The overflow grate spacing must be no greater than 2 inches across the smallest dimension; and
☐ The overflow g

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and cement, or similar grouting material, such that water will not pond in the outlet structure. This material must be sloped towards the discharge pipe to facilitate drainage, as shown in the detail below.

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etland, the allocation of the WQDS runoff volume is shown. The illustrations depict possible configurations and flow paths and are not intended to limit the design.

## Category 1: Pond Constructed Wetlands

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Pond Constructed Wetlands - Profile View

The illustration above shows the various components comprising a standard constructed wetland system from the pond category. Following the direction that runoff would take through the BMP; flow enters the system at A and then flows into the forebay spanning B to C. From the forebay, runoff flows over the spillway at C into the high marsh zone; it then enters the

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Mistral ID: img-7.jpeg. Extraction bundle(s): 2026_BMP_10_4_Standard_Constructed_Wetlands. Original page | Image file

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Tables on the same PDF page: Table 3

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Pond Constructed Wetlands - Plan View

The table below shows the design criteria specific to pond constructed wetlands; for additional design criteria, refer to the Basic Requirements section of this chapter, beginning on Page 3.

|  Pond Constructed Wetlands Design Criteria  |   |
| --- | --- |
|  Minimum Drainage Area | 25 Acres  |
|  Standing Water Depth: High Marsh Zone | Maximum 6 Inches  |
|  Stan

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# Category 2: Marsh Constructed Wetlands

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Marsh Constructed Wetlands - Profile View

The illustration above shows the various components comprising a standard constructed wetland system from the marsh category. As with pond constructed wetlands, the minimum inflow drainage area is 25 acres. In this illustration, again, stormwater runoff enters the system at A and then flows into the forebay spanning B to C. From the forebay, runoff flows over t

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Mistral ID: img-9.jpeg. Extraction bundle(s): 2026_BMP_10_4_Standard_Constructed_Wetlands. Original page | Image file

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Tables on the same PDF page: Table 4

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Marsh Constructed Wetlands - Plan View

The table below shows the design criteria specific to marsh constructed wetlands; for additional design criteria, refer to the Basic Requirements section of this chapter, beginning on Page 3.

|  Marsh Constructed Wetland Design Criteria  |   |
| --- | --- |
|  Minimum Drainage Area | 25 Acres  |
|  Standing Water Depth: High Marsh Zone | Maximum 6 inches  |
|  St

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# Category 3: Extended Detention Constructed Wetlands

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Extended Detention Constructed Wetlands - Plan View

The illustration above shows the various components comprising a standard constructed wetland system from the extended detention category, for which a profile view taken along the centerline would look almost the same as a marsh constructed wetlands. Following the direction that stormwater runoff would take through the BMP; runoff enters the forebay

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E-F depicts the view taken at the front face of the outlet riser structure. In these illustrations, the semi-wet zone has been sized to contain the volume of runoff generated by the 100-year design storm.

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Extended Detention Constructed Wetlands – Cross-section View A-B

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Extended Detention Constructed Wetlands – Cross-section View C-D

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tions, the semi-wet zone has been sized to contain the volume of runoff generated by the 100-year design storm.

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Extended Detention Constructed Wetlands – Cross-section View A-B

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Extended Detention Constructed Wetlands – Cross-section View C-D

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Tables on the same PDF page: Table 5

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# Extended Detention Constructed Wetlands – Cross-section View E-F

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The table below shows the design criteria specific to marsh constructed wetlands; for additional design criteria, refer to the Basic Requirements section of this chapter, beginning on Page 3.

|  Extended Detention Constructed Wetland Design Criteria  |   |
| --- | --- |
|  Minimum Drainage Area | 10 Acres  |
|  Standing Water Depth: High Marsh Zone | Maximum 6 Inches  |
|  Standing Water Depth: Low M

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low is available; a water budget must be included in this analysis. For more information on how to complete a water budget see the Water Budget Manual at http://www.nj.gov/dep/landuse/download/mit_011.pdf.

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