Tables: Subsurface Gravel Wetlands (Non-GI)¶
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1. Table 1¶
| N.J.A.C. 7:8 Stormwater Management Rules – Applicable Design and Performance Standards | ||
|---|---|---|
| Green Infrastructure | Not Allowed | |
| Stormwater Runoff Quantity | Not Allowed | |
| Groundwater Recharge | Not Allowed | |
| Stormwater Runoff Quality | Only with a waiver or variance from N.J.A.C. 7:8-5.3, 90% TSS, 90% Nitrogen | |
| Stormwater Runoff Quality Mechanisms and Corresponding Criteria | ||
| --- | --- | |
| Settling | ||
| Pretreatment | Required | |
| Presence of Surface Wetlands | Required | |
| Vegetative Uptake and Filtration | ||
| Minimum Density of Vegetation | 85% | |
| Appropriate Species Selection | See Chapter 7: Landscaping | |
| Denitrification | ||
| Submerged Gravel Cells | Required |
Source context and notes
Source revision: March 2021. # 11.5 SUBSURFACE GRAVEL WETLANDS [Figure: img-0.jpeg (original PDF, p. 1)](SOURCE.pdf#page=1) Subsurface gravel wetlands are a stormwater management system designed to maximize the removal of pollutants from stormwater runoff; the system is a combination of a surface marsh and a subsurface gravel bed. Pollutants are treated through settling, by both uptake and filtration by vegetation and by chemical transformation in the subsurface bed, specifically denitrification. Both the total suspended solids (TSS) removal rate and the nitrogen removal rate are 90%. However, subsurface gravel wetlands can only be used to address stormwater runoff water quality when a waiver or variance from N.J.A.C. 7:8-5.3 is granted as they are not considered to be green infrastructure. | N.J.A.C. 7:8 Stormwater Management Rules – Applicable Design and Performance Standards | | | | --- | --- | --- | | | Green Infrastructure | Not Allowed | | | Stormwater Runoff Quantity | Not Allowed | | | Groundwater Recharge | Not Allowed | | | Stormwater Runoff Quality | Only with a waiver or variance from N.J.A.C. 7:8-5.3, 90% TSS, 90% Nitrogen | | Stormwater Runoff Quality Mechanisms and Corresponding Criteria | | | --- | --- | | Settling | | | Pretreatment | Required | | Presence of Surface Wetlands | Required | | Vegetative Uptake and Filtration | | | Minimum Density of Vegetation | 85% | | Appropriate Species Selection | See Chapter 7: Landscaping | | Denitrification | | | Submerged Gravel Cells | Required |Images on table pages¶
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