Tables: Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy)¶
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1. Table 1 Green Infrastructure BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 14
| Table 1 Green Infrastructure BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity |
||||
|---|---|---|---|---|
| Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) |
| Cistern | 0 | Yes | No | -- |
| Dry Well(a) | 0 | No | Yes | 2 |
| Grass Swale | 50 or less | No | No | 2(e) 1(f) |
| Green Roof | 0 | Yes | No | -- |
| Manufactured Treatment Device(a) (g) | 50 or 80 | No | No | Dependent upon the device |
| Pervious Paving System(a) | 80 | Yes | Yes(b) No(c) |
2(b) 1(c) |
| Small-Scale Bioretention Basin(a) | 80 or 90 | Yes | Yes(b) No(c) |
2(b) 1(c) |
| Small-Scale Infiltration Basin(a) | 80 | Yes | Yes | 2 |
| Small-Scale Sand Filter | 80 | Yes | Yes | 2 |
| Vegetative Filter Strip | 60-80 | No | No | -- |
Source context and notes
| Table 1Green Infrastructure BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity | | | | | | --- | --- | --- | --- | --- | | Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) | | Cistern | 0 | Yes | No | -- | | Dry Well(a) | 0 | No | Yes | 2 | | Grass Swale | 50 or less | No | No | 2(e)
1(f) | | Green Roof | 0 | Yes | No | -- | | Manufactured Treatment Device(a) (g) | 50 or 80 | No | No | Dependent upon the device | | Pervious Paving System(a) | 80 | Yes | Yes(b)
No(c) | 2(b)
1(c) | | Small-Scale Bioretention Basin(a) | 80 or 90 | Yes | Yes(b)
No(c) | 2(b)
1(c) | | Small-Scale Infiltration Basin(a) | 80 | Yes | Yes | 2 | | Small-Scale Sand Filter | 80 | Yes | Yes | 2 | | Vegetative Filter Strip | 60-80 | No | No | -- | (Notes corresponding to annotations (a) through (g) are found on Page D-16)
2. Table 2 Green Infrastructure BMPs for Stormwater Runoff Quantity (or for Groundwater Recharge and/or Stormwater Runoff Quality with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O)¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 15
| Table 2 Green Infrastructure BMPs for Stormwater Runoff Quantity (or for Groundwater Recharge and/or Stormwater Runoff Quality with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O) |
||||
|---|---|---|---|---|
| Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) |
| Bioretention System | 80 or 90 | Yes | Yes^{(b)} No^{(c)} |
2^{(b)} 1^{(c)} |
| Infiltration Basin | 80 | Yes | Yes | 2 |
| Sand Filter^{(b)} | 80 | Yes | Yes | 2 |
| Standard Constructed Wetland | 90 | Yes | No | N/A |
| Wet Pond^{(d)} | 50-90 | Yes | No | N/A |
Source context and notes
| Table 2Green Infrastructure BMPs for Stormwater Runoff Quantity
(or for Groundwater Recharge and/or Stormwater Runoff Quality
with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O) | | | | | | --- | --- | --- | --- | --- | | Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) | | Bioretention System | 80 or 90 | Yes | Yes^{(b)}
No^{(c)} | 2^{(b)}
1^{(c)} | | Infiltration Basin | 80 | Yes | Yes | 2 | | Sand Filter^{(b)} | 80 | Yes | Yes | 2 | | Standard Constructed Wetland | 90 | Yes | No | N/A | | Wet Pond^{(d)} | 50-90 | Yes | No | N/A | (Notes corresponding to annotations (b) through (d) are found on Page D-16) | Table 3
BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity
only with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O | | | | | | --- | --- | --- | --- | --- | | Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) | | Blue Roof | 0 | Yes | No | N/A | | Extended Detention Basin | 40-60 | Yes | No | 1 | | Manufactured Treatment Device^{(h)} | 50 or 80 | No | No | Dependent upon the device | | Sand Filter^{(c)} | 80 | Yes | No | 1 | | Subsurface Gravel Wetland | 90 | No | No | 1 | | Wet Pond | 50-90 | Yes | No | N/A | (Notes corresponding to annotations (b) through (d) are found on Page D-16)
3. Table 3 BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity only with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 15
| Table 3 BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity only with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O |
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|---|---|---|---|---|
| Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) |
| Blue Roof | 0 | Yes | No | N/A |
| Extended Detention Basin | 40-60 | Yes | No | 1 |
| Manufactured Treatment Device^{(h)} | 50 or 80 | No | No | Dependent upon the device |
| Sand Filter^{(c)} | 80 | Yes | No | 1 |
| Subsurface Gravel Wetland | 90 | No | No | 1 |
| Wet Pond | 50-90 | Yes | No | N/A |
Source context and notes
| Bioretention System | 80 or 90 | Yes | Yes^{(b)}No^{(c)} | 2^{(b)}
1^{(c)} | | Infiltration Basin | 80 | Yes | Yes | 2 | | Sand Filter^{(b)} | 80 | Yes | Yes | 2 | | Standard Constructed Wetland | 90 | Yes | No | N/A | | Wet Pond^{(d)} | 50-90 | Yes | No | N/A | (Notes corresponding to annotations (b) through (d) are found on Page D-16) | Table 3
BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity
only with a Waiver or Variance from N.J.A.C. 7:8-5.3Section IV.O | | | | | | --- | --- | --- | --- | --- | | Best Management Practice | Stormwater Runoff Quality TSS Removal Rate (percent) | Stormwater Runoff Quantity | Groundwater Recharge | Minimum Separation from Seasonal High Water Table (feet) | | Blue Roof | 0 | Yes | No | N/A | | Extended Detention Basin | 40-60 | Yes | No | 1 | | Manufactured Treatment Device^{(h)} | 50 or 80 | No | No | Dependent upon the device | | Sand Filter^{(c)} | 80 | Yes | No | 1 | | Subsurface Gravel Wetland | 90 | No | No | 1 | | Wet Pond | 50-90 | Yes | No | N/A | (Notes corresponding to annotations (b) through (d) are found on Page D-16)
4. Table 4¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 19
| Best Management Practice | Maximum Contributory Drainage Area |
|---|---|
| Dry Well | 1 acre |
| Manufactured Treatment Device | 2.5 acres |
| Pervious Pavement Systems | Area of additional inflow cannot exceed three times the area occupied by the BMP |
| Small-scale Bioretention Systems | 2.5 acres |
| Small-scale Infiltration Basin | 2.5 acres |
| Small-scale Sand Filter | 2.5 acres |
Source context and notes
2. To Except as provided at O.6 through O.10 below, to satisfy the groundwater recharge and stormwater runoff quality standards at Sections IV.P and Q, the design engineer shall utilize green infrastructure BMPs identified in Table 1 at Section IV.F and/or an alternative stormwater management measure approved in accordance with Section IV.G. The following green infrastructure BMPs are subject to the following maximum contributory drainage area limitations: | Best Management Practice | Maximum Contributory Drainage Area | | --- | --- | | Dry Well | 1 acre | | Manufactured Treatment Device | 2.5 acres | | Pervious Pavement Systems | Area of additional inflow cannot exceed three times the area occupied by the BMP | | Small-scale Bioretention Systems | 2.5 acres | | Small-scale Infiltration Basin | 2.5 acres | | Small-scale Sand Filter | 2.5 acres | 3. To Except as provided at O.6, O.7.i, O.7.iii, O.8, O.9 and O.10 below, to satisfy the stormwater runoff quantity standards at Section IV.R, the design engineer shall utilize BMPs from Table 1 or from Table 2 and/or an alternative stormwater management measure approved in accordance with Section IV.G. 4. If a variance in accordance with N.J.A.C. 7:8-4.6 {Section XI, if the optional Section XI is adopted} or a waiver from strict compliance in accordance with Section IV.D is granted from the requirements of this subsection, then BMPs from Table 1, 2, or 3, and/or an alternative stormwater management measure approved in accordance with Section IV.G may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at Sections IV.P, Q and R. 5. For separate or combined storm sewer improvement projects, such as sewer separation, undertaken by a government agency or public utility (for example, a sewerage company), the requirements of this subsection shall only apply to areas owned in fee simple by the government agency or utility, and areas within a right-of-way or easement held or controlled by the government agency or utility; the entity shall not be required to obtain additional property or property rights to fully satisfy the requirements of this subsection. Regardless of the amount of area of a separate or combined storm sewer improvement project subject to the green infrastructure requirements of this subsection, each project shall fully comply with the applicable groundwater recharge, stormwater runoff quality control, and stormwater runoff quantity standards at Sections IV.P, Q and R, unless the project is granted a waiver from strict compliance in accordance with Section IV.D.5. Table 4 - Water Quality Design Storm Distribution¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 25
| Time (Minutes) | Cumulative Rainfall (Inches) | Time (Minutes) | Cumulative Rainfall (Inches) | Time (Minutes) | Cumulative Rainfall (Inches) |
|---|---|---|---|---|---|
| 1 | 0.00166 | 41 | 0.1728 | 81 | 1.0906 |
| 2 | 0.00332 | 42 | 0.1796 | 82 | 1.0972 |
| 3 | 0.00498 | 43 | 0.1864 | 83 | 1.1038 |
| 4 | 0.00664 | 44 | 0.1932 | 84 | 1.1104 |
| 5 | 0.00830 | 45 | 0.2000 | 85 | 1.1170 |
| 6 | 0.00996 | 46 | 0.2117 | 86 | 1.1236 |
| 7 | 0.01162 | 47 | 0.2233 | 87 | 1.1302 |
| 8 | 0.01328 | 48 | 0.2350 | 88 | 1.1368 |
| 9 | 0.01494 | 49 | 0.2466 | 89 | 1.1434 |
| 10 | 0.01660 | 50 | 0.2583 | 90 | 1.1500 |
| 11 | 0.01828 | 51 | 0.2783 | 91 | 1.1550 |
| 12 | 0.01996 | 52 | 0.2983 | 92 | 1.1600 |
| 13 | 0.02164 | 53 | 0.3183 | 93 | 1.1650 |
| 14 | 0.02332 | 54 | 0.3383 | 94 | 1.1700 |
| 15 | 0.02500 | 55 | 0.3583 | 95 | 1.1750 |
| 16 | 0.03000 | 56 | 0.4116 | 96 | 1.1800 |
| 17 | 0.03500 | 57 | 0.4650 | 97 | 1.1850 |
| 18 | 0.04000 | 58 | 0.5183 | 98 | 1.1900 |
| 19 | 0.04500 | 59 | 0.5717 | 99 | 1.1950 |
| 20 | 0.05000 | 60 | 0.6250 | 100 | 1.2000 |
| 21 | 0.05500 | 61 | 0.6783 | 101 | 1.2050 |
| 22 | 0.06000 | 62 | 0.7317 | 102 | 1.2100 |
| 23 | 0.06500 | 63 | 0.7850 | 103 | 1.2150 |
| 24 | 0.07000 | 64 | 0.8384 | 104 | 1.2200 |
| 25 | 0.07500 | 65 | 0.8917 | 105 | 1.2250 |
| 26 | 0.08000 | 66 | 0.9117 | 106 | 1.2267 |
| 27 | 0.08500 | 67 | 0.9317 | 107 | 1.2284 |
| 28 | 0.09000 | 68 | 0.9517 | 108 | 1.2300 |
| 29 | 0.09500 | 69 | 0.9717 | 109 | 1.2317 |
| 30 | 0.10000 | 70 | 0.9917 | 110 | 1.2334 |
| 31 | 0.10660 | 71 | 1.0034 | 111 | 1.2351 |
| 32 | 0.11320 | 72 | 1.0150 | 112 | 1.2367 |
| 33 | 0.11980 | 73 | 1.0267 | 113 | 1.2384 |
| 34 | 0.12640 | 74 | 1.0383 | 114 | 1.2400 |
| 35 | 0.13300 | 75 | 1.0500 | 115 | 1.2417 |
| 36 | 0.13960 | 76 | 1.0568 | 116 | 1.2434 |
| 37 | 0.14620 | 77 | 1.0636 | 117 | 1.2450 |
| 38 | 0.15280 | 78 | 1.0704 | 118 | 1.2467 |
| 39 | 0.15940 | 79 | 1.0772 | 119 | 1.2483 |
| 40 | 0.16600 | 80 | 1.0840 | 120 | 1.2500 |
Source context and notes
Table 4 - Water Quality Design Storm Distribution | Time (Minutes) | Cumulative Rainfall (Inches) | Time (Minutes) | Cumulative Rainfall (Inches) | Time (Minutes) | Cumulative Rainfall (Inches) | | --- | --- | --- | --- | --- | --- | | 1 | 0.00166 | 41 | 0.1728 | 81 | 1.0906 | | 2 | 0.00332 | 42 | 0.1796 | 82 | 1.0972 | | 3 | 0.00498 | 43 | 0.1864 | 83 | 1.1038 | | 4 | 0.00664 | 44 | 0.1932 | 84 | 1.1104 | | 5 | 0.00830 | 45 | 0.2000 | 85 | 1.1170 | | 6 | 0.00996 | 46 | 0.2117 | 86 | 1.1236 | | 7 | 0.01162 | 47 | 0.2233 | 87 | 1.1302 | | 8 | 0.01328 | 48 | 0.2350 | 88 | 1.1368 | | 9 | 0.01494 | 49 | 0.2466 | 89 | 1.1434 | | 10 | 0.01660 | 50 | 0.2583 | 90 | 1.1500 | | 11 | 0.01828 | 51 | 0.2783 | 91 | 1.1550 | | 12 | 0.01996 | 52 | 0.2983 | 92 | 1.1600 | | 13 | 0.02164 | 53 | 0.3183 | 93 | 1.1650 | | 14 | 0.02332 | 54 | 0.3383 | 94 | 1.1700 | | 15 | 0.02500 | 55 | 0.3583 | 95 | 1.1750 | | 16 | 0.03000 | 56 | 0.4116 | 96 | 1.1800 | | 17 | 0.03500 | 57 | 0.4650 | 97 | 1.1850 | | 18 | 0.04000 | 58 | 0.5183 | 98 | 1.1900 | | 19 | 0.04500 | 59 | 0.5717 | 99 | 1.1950 | | 20 | 0.05000 | 60 | 0.6250 | 100 | 1.2000 | | 21 | 0.05500 | 61 | 0.6783 | 101 | 1.2050 | | 22 | 0.06000 | 62 | 0.7317 | 102 | 1.2100 | | 23 | 0.06500 | 63 | 0.7850 | 103 | 1.2150 | | 24 | 0.07000 | 64 | 0.8384 | 104 | 1.2200 | | 25 | 0.07500 | 65 | 0.8917 | 105 | 1.2250 | | 26 | 0.08000 | 66 | 0.9117 | 106 | 1.2267 | | 27 | 0.08500 | 67 | 0.9317 | 107 | 1.2284 | | 28 | 0.09000 | 68 | 0.9517 | 108 | 1.2300 | | 29 | 0.09500 | 69 | 0.9717 | 109 | 1.2317 | | 30 | 0.10000 | 70 | 0.9917 | 110 | 1.2334 | | 31 | 0.10660 | 71 | 1.0034 | 111 | 1.2351 | | 32 | 0.11320 | 72 | 1.0150 | 112 | 1.2367 | | 33 | 0.11980 | 73 | 1.0267 | 113 | 1.2384 | | 34 | 0.12640 | 74 | 1.0383 | 114 | 1.2400 | | 35 | 0.13300 | 75 | 1.0500 | 115 | 1.2417 | | 36 | 0.13960 | 76 | 1.0568 | 116 | 1.2434 | | 37 | 0.14620 | 77 | 1.0636 | 117 | 1.2450 | | 38 | 0.15280 | 78 | 1.0704 | 118 | 1.2467 | | 39 | 0.15940 | 79 | 1.0772 | 119 | 1.2483 | | 40 | 0.16600 | 80 | 1.0840 | 120 | 1.2500 | 5. If more than one BMP in series is necessary to achieve the required 80 percent TSS reduction for a site, the applicant shall utilize the following formula to calculate TSS reduction:6. Table 5: Current Precipitation Adjustment Factors¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 31
| County | Current Precipitation Adjustment Factors | ||
|---|---|---|---|
| 2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
| Atlantic | 1.01 | 1.02 | 1.03 |
| Bergen | 1.01 | 1.03 | 1.06 |
| Burlington | 0.99 | 1.01 | 1.04 |
| Camden | 1.03 | 1.04 | 1.05 |
| Cape May | 1.03 | 1.03 | 1.04 |
| Cumberland | 1.03 | 1.03 | 1.01 |
| Essex | 1.01 | 1.03 | 1.06 |
| Gloucester | 1.05 | 1.06 | 1.06 |
| Hudson | 1.03 | 1.05 | 1.09 |
| Hunterdon | 1.02 | 1.05 | 1.13 |
| Mercer | 1.01 | 1.02 | 1.04 |
| Middlesex | 1.00 | 1.01 | 1.03 |
| Monmouth | 1.00 | 1.01 | 1.02 |
| Morris | 1.01 | 1.03 | 1.06 |
| Ocean | 1.00 | 1.01 | 1.03 |
| Passaic | 1.00 | 1.02 | 1.05 |
| Salem | 1.02 | 1.03 | 1.03 |
| Somerset | 1.00 | 1.03 | 1.09 |
| Sussex | 1.03 | 1.04 | 1.07 |
| Union | 1.01 | 1.03 | 1.06 |
| Warren | 1.02 | 1.07 | 1.15 |
Source context and notes
Table 5: Current Precipitation Adjustment Factors | County | Current Precipitation Adjustment Factors | | | | --- | --- | --- | --- | | | 2-year Design Storm | 10-year Design Storm | 100-year Design Storm | | Atlantic | 1.01 | 1.02 | 1.03 | | Bergen | 1.01 | 1.03 | 1.06 | | Burlington | 0.99 | 1.01 | 1.04 | | Camden | 1.03 | 1.04 | 1.05 | | Cape May | 1.03 | 1.03 | 1.04 | | Cumberland | 1.03 | 1.03 | 1.01 | | Essex | 1.01 | 1.03 | 1.06 | | Gloucester | 1.05 | 1.06 | 1.06 | | Hudson | 1.03 | 1.05 | 1.09 | | Hunterdon | 1.02 | 1.05 | 1.13 | | Mercer | 1.01 | 1.02 | 1.04 | | Middlesex | 1.00 | 1.01 | 1.03 | | Monmouth | 1.00 | 1.01 | 1.02 | | Morris | 1.01 | 1.03 | 1.06 | | Ocean | 1.00 | 1.01 | 1.03 | | Passaic | 1.00 | 1.02 | 1.05 | | Salem | 1.02 | 1.03 | 1.03 | | Somerset | 1.00 | 1.03 | 1.09 | | Sussex | 1.03 | 1.04 | 1.07 | | Union | 1.01 | 1.03 | 1.06 | | Warren | 1.02 | 1.07 | 1.15 | D. Table 6: Future Precipitation Change Factors provided below sets forth the change factors to be used in determining the projected two-, 10-, and 100-year storm events for use in this chapter ordinance, which are organized alphabetically by county. The precipitation depth of the projected two-, 10-, and 100-year storm events of a site shall be determined by multiplying the precipitation depth of the two-, 10-, and 100-year storm events determined from the National Weather Service's Atlas 14 Point Precipitation Frequency Estimates pursuant to C.1 above, by the change factor in the table below, in accordance with the county or counties where the drainage area(s) of the site is located. Where the major development and/or its drainage area lies in more than one county, the precipitation values shall be adjusted according to the percentage of the drainage area in each county. Alternately, separate rainfall totals can be developed for each county using the values in the table below.7. Table 6: Future Precipitation Change Factors¶
Appendix D: Model Stormwater Control Ordinance for Municipalities (strikethrough copy), PDF p. 32
| County | Future Precipitation Change Factors | ||
|---|---|---|---|
| 2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
| Atlantic | 1.22 | 1.24 | 1.39 |
| Bergen | 1.20 | 1.23 | 1.37 |
| Burlington | 1.17 | 1.18 | 1.32 |
| Camden | 1.18 | 1.22 | 1.39 |
| Cape May | 1.21 | 1.24 | 1.32 |
| Cumberland | 1.20 | 1.21 | 1.39 |
| Essex | 1.19 | 1.22 | 1.33 |
| Gloucester | 1.19 | 1.23 | 1.41 |
| Hudson | 1.19 | 1.19 | 1.23 |
| Hunterdon | 1.19 | 1.23 | 1.42 |
| Mercer | 1.16 | 1.17 | 1.36 |
| Middlesex | 1.19 | 1.21 | 1.33 |
| Monmouth | 1.19 | 1.19 | 1.26 |
| Morris | 1.23 | 1.28 | 1.46 |
| Ocean | 1.18 | 1.19 | 1.24 |
| Passaic | 1.21 | 1.27 | 1.50 |
| Salem | 1.20 | 1.23 | 1.32 |
| Somerset | 1.19 | 1.24 | 1.48 |
| Sussex | 1.24 | 1.29 | 1.50 |
| Union | 1.20 | 1.23 | 1.35 |
| Warren | 1.20 | 1.25 | 1.37 |