Tables: Standard Constructed Wetlands (Large-Scale GI)¶
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1. Table 1¶
| N.J.A.C. 7:8 Stormwater Management Rules – Applicable Design and Performance Standards | ||
|---|---|---|
| Green Infrastructure | Yes | |
| Stormwater Runoff Quantity | When designed to receive runoff from all storm events as an on-line system | |
| Groundwater Recharge | Not Allowed | |
| Stormwater Runoff Quality | Only with a waiver or variance from N.J.A.C. 7:8-5.3, 90% TSS | |
| Stormwater Runoff Quality Mechanisms and Corresponding Criteria | ||
| --- | --- | |
| Settling | ||
| Minimum Length to Width Ratio | 1:1 | |
| Sinuous Flow Pathway | Recommended | |
| Presence of a Permanent Pool | Required | |
| Vegetative Uptake and Filtration | ||
| Minimum Density of Vegetation | 85% | |
| Appropriate Species Selection | See Chapter 7: Landscaping | |
| Minimum Inflow Drainage Area | Pond Category: 25 acres Marsh Category: 25 acres Extended Detention: 10 acres |
Source context and notes
Source revision: March 2021. # 10.4 STANDARD CONSTRUCTED WETLANDS [Figure: img-0.jpeg (original PDF, p. 1)](SOURCE.pdf#page=1) 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.C. 7:8 Stormwater Management Rules – Applicable Design and Performance Standards | | | | --- | --- | --- | | | Green Infrastructure | Yes | | | Stormwater Runoff Quantity | When designed to receive runoff from all storm events as an on-line system | | | Groundwater Recharge | Not Allowed | | | Stormwater Runoff Quality | Only with a waiver or variance from N.J.A.C. 7:8-5.3, 90% TSS | | Stormwater Runoff Quality Mechanisms and Corresponding Criteria | | | --- | --- | | Settling | | | Minimum Length to Width Ratio | 1:1 | | Sinuous Flow Pathway | Recommended | | Presence of a Permanent Pool | Required | | Vegetative Uptake and Filtration | | | Minimum Density of Vegetation | 85% | | Appropriate Species Selection | See Chapter 7: Landscaping | | Minimum Inflow Drainage Area | Pond Category: 25 acresMarsh Category: 25 acres
Extended Detention: 10 acres |
2. Table 2¶
| Design Component | Required Size, as a Percentage of the Water Quality Design Storm Volume, By Category | ||
|---|---|---|---|
| Pond Wetlands | Marsh Wetlands | Extended Detention Wetlands | |
| Pretreatment Zone* | 10 | 10 | 10 |
| Semi-wet Zone | Not Applicable | Not Applicable | 50 |
| High Marsh Zone | 10 | 25 | 10 |
| Low Marsh Zone | 20 | 45 | 20 |
| Pool Zone | 60 | 20 | 10 |
Source context and notes
There are three categories of standard constructed wetlands: 1. Pond constructed wetlands 2. Marsh constructed wetlands 3. Extended detention constructed wetlands The categories of standard constructed wetlands can be differentiated primarily by the allocation of the WQDS volume in each of their components; these volume allocations are shown in the table below. | Design Component | Required Size, as a Percentage of the Water Quality Design Storm Volume, By Category | | | | --- | --- | --- | --- | | | Pond Wetlands | Marsh Wetlands | Extended Detention Wetlands | | Pretreatment Zone* | 10 | 10 | 10 | | Semi-wet Zone | Not Applicable | Not Applicable | 50 | | High Marsh Zone | 10 | 25 | 10 | | Low Marsh Zone | 20 | 45 | 20 | | Pool Zone | 60 | 20 | 10 | *The 10% Water Quality Design Storm volume allocation for this component is only applicable to those systems that utilize a forebay in the pretreatment zone; all other pretreatment options must be sized separately from the remainder of the system. For more information, see the categories below.3. Table 3¶
| Pond Constructed Wetlands Design Criteria | |
|---|---|
| Minimum Drainage Area | 25 Acres |
| Standing Water Depth: High Marsh Zone | Maximum 6 Inches |
| Standing Water Depth: Low Marsh Zone | 6 – 18 Inches |
| Standing Water Depth: Pool Zone | 4 – 6 Feet |
| Minimum Length to Width Ratio | 1:1 |
Source context and notes
Source revision: March 2021. # Pond Constructed Wetlands - Plan View [Figure: img-7.jpeg (original PDF, p. 11)](SOURCE.pdf#page=11) 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 | | Standing Water Depth: Low Marsh Zone | 6 – 18 Inches | | Standing Water Depth: Pool Zone | 4 – 6 Feet | | Minimum Length to Width Ratio | 1:1 |4. Table 4¶
| Marsh Constructed Wetland Design Criteria | |
|---|---|
| Minimum Drainage Area | 25 Acres |
| Standing Water Depth: High Marsh Zone | Maximum 6 inches |
| Standing Water Depth: Low Marsh Zone | 6 – 18 inches |
| Standing Water Depth: Pool Zone | 4 – 6 Feet |
| Minimum Length to Width Ratio | 1:1 |
Source context and notes
Source revision: March 2021. # Marsh Constructed Wetlands - Plan View [Figure: img-9.jpeg (original PDF, p. 13)](SOURCE.pdf#page=13) 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 | | Standing Water Depth: Low Marsh Zone | 6 – 18 inches | | Standing Water Depth: Pool Zone | 4 – 6 Feet | | Minimum Length to Width Ratio | 1:1 |5. Table 5¶
| Extended Detention Constructed Wetland Design Criteria | |
|---|---|
| Minimum Drainage Area | 10 Acres |
| Standing Water Depth: High Marsh Zone | Maximum 6 Inches |
| Standing Water Depth: Low Marsh Zone | 6 – 18 Inches |
| Standing Water Depth: Pool Zone | 4 – 6 Feet |
| Standing Water Depth: Semi-Wet Zone | Only inundated during storm events |
| Minimum Length to Width Ratio | 1:1 |
Source context and notes
Source revision: March 2021. # Extended Detention Constructed Wetlands – Cross-section View E-F [Figure: img-13.jpeg (original PDF, p. 16)](SOURCE.pdf#page=16) 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 Marsh Zone | 6 – 18 Inches | | Standing Water Depth: Pool Zone | 4 – 6 Feet | | Standing Water Depth: Semi-Wet Zone | Only inundated during storm events | | Minimum Length to Width Ratio | 1:1 |Images on table pages¶
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