Supplemental Design Standards and Management Programs.
FIRE HAZARD CLASSIFICATION | |
|---|---|
HAZARD | VEGETATION TYPE |
Low | Atlantic White Cedar Hardwood Swamps |
Moderate | Non-pine barrens forest Prescribed burned areas |
High | Fine barrens forest including mature forms of pine, pine-oak, or oak-pine. |
Extreme | Immature or dwarf forms of pine-oak or oak-pine; all classes of pine-scrub oak and pine-lowland |
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) | 2(b) |
No(c) | 2(b) | |||
Small-Scale bioretention basin(a) | 80 or 90 | Yes | Yes(b) | 2(b) |
No(c) | 1(c) | |||
Small-Scale infiltration basin(a) | 80 | Yes | Yes | 2 |
Small-Scale sand filter(a) | 80 | Yes | Yes | 2 |
Vegetative filter strip | 60 to 80 | No | No | — |
Table 2: Green Infrastructure BMPs for Stormwater Runoff Quantity (or for Groundwater Recharge and/or Stormwater Runoff Quality with a Variance from N.J.A.C. 7:8-5.3) | ||||
|---|---|---|---|---|
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) | 2(b) |
No(c) | 1(c) | |||
Infiltration basin | 80 | Yes | Yes | 2 |
Sand filter(b) | 80 | Yes | Yes | 2 |
Standard constructed wetland | 90 | Yes | No | 2(i) |
Wet pond(d) | 50 to 90 | Yes | No | 2(i) |
Table 3: BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity only with a Variance from N.J.A.C. 7:8-5.3 | ||||
|---|---|---|---|---|
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 to 60 | Yes | No | 2 |
Manufactured treatment device(h) | 50 or 80 | No | No | Dependent upon the device |
Sand filter(c) | 80 | Yes | No | 2 |
Subsurface gravel wetland | 90 | No | No | 2 |
Wet pond | 50 to 90 | Yes | No | 2(i) |
Footnotes to Tables 1, 2, and 3: | |
|---|---|
(a) | Subject to the applicable contributory drainage area limitation specified at paragraph (n)(2) below. |
(b) | Designed to infiltrate into the subsoil. |
(c) | Designed with underdrains, where stormwater percolates into the underdrain through the soils and is not directed to the underdrain by an outlet control structure. |
(d) | Designed to maintain at least a ten-foot-wide area of native vegetation along at least 50% of the shoreline and to include a stormwater runoff retention component designed to capture stormwater runoff for beneficial reuse, such as irrigation. |
(e) | Designed with a slope of less than 2%. |
(f) | Designed with a slope of equal to or greater than 2%. |
(g) | Manufactured treatment devices that meet the definition of "green infrastructure" at Subsection 15-14.21r2. |
(h) | Manufactured treatment devices that do not meet the definition of "green infrastructure" at Subsection 15-14.21r2. |
(i) | The top elevation of the impermeable layer or liner must maintain this two-foot minimum separation to the seasonal high water table. |
Best Management Practice | Maximum Contributory Drainage Area |
|---|---|
Dry well | 1 acre |
Manufactured treatment device | 2.5 acres |
Pervious pavement system | 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 |
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 | 0.0083 | 45 | 0.2 | 85 | 1.117 |
6 | 0.00996 | 46 | 0.2117 | 86 | 1.1236 |
7 | 0.01162 | 47 | 0.2233 | 87 | 1.1302 |
8 | 0.01328 | 48 | 0.235 | 88 | 1.1368 |
9 | 0.01494 | 49 | 0.2466 | 89 | 1.1434 |
10 | 0.0166 | 50 | 0.2583 | 90 | 1.15 |
11 | 0.01828 | 51 | 0.2783 | 91 | 1.155 |
12 | 0.01996 | 52 | 0.2983 | 92 | 1.16 |
13 | 0.02164 | 53 | 0.3183 | 93 | 1.165 |
14 | 0.02332 | 54 | 0.3383 | 94 | 1.17 |
15 | 0.025 | 55 | 0.3583 | 95 | 1.175 |
16 | 0.03 | 56 | 0.4116 | 96 | 1.18 |
17 | 0.035 | 57 | 0.465 | 97 | 1.185 |
18 | 0.04 | 58 | 0.5183 | 98 | 1.19 |
19 | 0.045 | 59 | 0.5717 | 99 | 1.195 |
20 | 0.05 | 60 | 0.625 | 100 | 1.2 |
21 | 0.055 | 61 | 0.6783 | 101 | 1.205 |
22 | 0.06 | 62 | 0.7317 | 102 | 1.21 |
23 | 0.065 | 63 | 0.785 | 103 | 1.215 |
24 | 0.07 | 64 | 0.8384 | 104 | 1.22 |
25 | 0.075 | 65 | 0.8917 | 105 | 1.225 |
26 | 0.08 | 66 | 0.9117 | 106 | 1.2267 |
27 | 0.085 | 67 | 0.9317 | 107 | 1.2284 |
28 | 0.09 | 68 | 0.9517 | 108 | 1.23 |
29 | 0.095 | 69 | 0.9717 | 109 | 1.2317 |
30 | 0.1 | 70 | 0.9917 | 110 | 1.2334 |
31 | 0.1066 | 71 | 1.0034 | 111 | 1.2351 |
32 | 0.1132 | 72 | 1.015 | 112 | 1.2367 |
33 | 0.1198 | 73 | 1.0267 | 113 | 1.2384 |
34 | 0.1264 | 74 | 1.0383 | 114 | 1.24 |
35 | 0.133 | 75 | 1.05 | 115 | 1.2417 |
36 | 0.1396 | 76 | 1.0568 | 116 | 1.2434 |
37 | 0.1462 | 77 | 1.0636 | 117 | 1.245 |
38 | 0.1528 | 78 | 1.0704 | 118 | 1.2467 |
39 | 0.1594 | 79 | 1.0772 | 119 | 1.2483 |
40 | 0.166 | 80 | 1.084 | 120 | 1.25 |
R = A + B - (A x B)/100 | ||
Where: | ||
R | = | Total TSS percent load removal from application of both BMPs; and |
A | = | The TSS percent removal rate applicable to the first BMP; |
B | = | The TSS percent removal rate applicable to the second BMP. |
Table 5. Current Precipitation Adjustment Factors | |||
|---|---|---|---|
County | Current Precipitation Adjustment Factors | ||
2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
Burlington | 0.99 | 1.01 | 1.04 |
Ocean | 1.00 | 1.01 | 1.03 |
Table 6. Future Precipitation Change Factors | |||
|---|---|---|---|
County | Future Precipitation Change Factors | ||
2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
Burlington | 1.17 | 1.18 | 1.32 |
Ocean | 1.18 | 1.19 | 1.24 |
Parcel Size | RD-1, RD-2 Districts | FA District |
|---|---|---|
<50 acres | 0 | 0 |
50-99.99 acres | 10% | 20% |
100-149.99 acres | 15% | 25% |
>=150 acres | 20% | 30% |
Supplemental Design Standards and Management Programs.
FIRE HAZARD CLASSIFICATION | |
|---|---|
HAZARD | VEGETATION TYPE |
Low | Atlantic White Cedar Hardwood Swamps |
Moderate | Non-pine barrens forest Prescribed burned areas |
High | Fine barrens forest including mature forms of pine, pine-oak, or oak-pine. |
Extreme | Immature or dwarf forms of pine-oak or oak-pine; all classes of pine-scrub oak and pine-lowland |
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) | 2(b) |
No(c) | 2(b) | |||
Small-Scale bioretention basin(a) | 80 or 90 | Yes | Yes(b) | 2(b) |
No(c) | 1(c) | |||
Small-Scale infiltration basin(a) | 80 | Yes | Yes | 2 |
Small-Scale sand filter(a) | 80 | Yes | Yes | 2 |
Vegetative filter strip | 60 to 80 | No | No | — |
Table 2: Green Infrastructure BMPs for Stormwater Runoff Quantity (or for Groundwater Recharge and/or Stormwater Runoff Quality with a Variance from N.J.A.C. 7:8-5.3) | ||||
|---|---|---|---|---|
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) | 2(b) |
No(c) | 1(c) | |||
Infiltration basin | 80 | Yes | Yes | 2 |
Sand filter(b) | 80 | Yes | Yes | 2 |
Standard constructed wetland | 90 | Yes | No | 2(i) |
Wet pond(d) | 50 to 90 | Yes | No | 2(i) |
Table 3: BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity only with a Variance from N.J.A.C. 7:8-5.3 | ||||
|---|---|---|---|---|
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 to 60 | Yes | No | 2 |
Manufactured treatment device(h) | 50 or 80 | No | No | Dependent upon the device |
Sand filter(c) | 80 | Yes | No | 2 |
Subsurface gravel wetland | 90 | No | No | 2 |
Wet pond | 50 to 90 | Yes | No | 2(i) |
Footnotes to Tables 1, 2, and 3: | |
|---|---|
(a) | Subject to the applicable contributory drainage area limitation specified at paragraph (n)(2) below. |
(b) | Designed to infiltrate into the subsoil. |
(c) | Designed with underdrains, where stormwater percolates into the underdrain through the soils and is not directed to the underdrain by an outlet control structure. |
(d) | Designed to maintain at least a ten-foot-wide area of native vegetation along at least 50% of the shoreline and to include a stormwater runoff retention component designed to capture stormwater runoff for beneficial reuse, such as irrigation. |
(e) | Designed with a slope of less than 2%. |
(f) | Designed with a slope of equal to or greater than 2%. |
(g) | Manufactured treatment devices that meet the definition of "green infrastructure" at Subsection 15-14.21r2. |
(h) | Manufactured treatment devices that do not meet the definition of "green infrastructure" at Subsection 15-14.21r2. |
(i) | The top elevation of the impermeable layer or liner must maintain this two-foot minimum separation to the seasonal high water table. |
Best Management Practice | Maximum Contributory Drainage Area |
|---|---|
Dry well | 1 acre |
Manufactured treatment device | 2.5 acres |
Pervious pavement system | 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 |
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 | 0.0083 | 45 | 0.2 | 85 | 1.117 |
6 | 0.00996 | 46 | 0.2117 | 86 | 1.1236 |
7 | 0.01162 | 47 | 0.2233 | 87 | 1.1302 |
8 | 0.01328 | 48 | 0.235 | 88 | 1.1368 |
9 | 0.01494 | 49 | 0.2466 | 89 | 1.1434 |
10 | 0.0166 | 50 | 0.2583 | 90 | 1.15 |
11 | 0.01828 | 51 | 0.2783 | 91 | 1.155 |
12 | 0.01996 | 52 | 0.2983 | 92 | 1.16 |
13 | 0.02164 | 53 | 0.3183 | 93 | 1.165 |
14 | 0.02332 | 54 | 0.3383 | 94 | 1.17 |
15 | 0.025 | 55 | 0.3583 | 95 | 1.175 |
16 | 0.03 | 56 | 0.4116 | 96 | 1.18 |
17 | 0.035 | 57 | 0.465 | 97 | 1.185 |
18 | 0.04 | 58 | 0.5183 | 98 | 1.19 |
19 | 0.045 | 59 | 0.5717 | 99 | 1.195 |
20 | 0.05 | 60 | 0.625 | 100 | 1.2 |
21 | 0.055 | 61 | 0.6783 | 101 | 1.205 |
22 | 0.06 | 62 | 0.7317 | 102 | 1.21 |
23 | 0.065 | 63 | 0.785 | 103 | 1.215 |
24 | 0.07 | 64 | 0.8384 | 104 | 1.22 |
25 | 0.075 | 65 | 0.8917 | 105 | 1.225 |
26 | 0.08 | 66 | 0.9117 | 106 | 1.2267 |
27 | 0.085 | 67 | 0.9317 | 107 | 1.2284 |
28 | 0.09 | 68 | 0.9517 | 108 | 1.23 |
29 | 0.095 | 69 | 0.9717 | 109 | 1.2317 |
30 | 0.1 | 70 | 0.9917 | 110 | 1.2334 |
31 | 0.1066 | 71 | 1.0034 | 111 | 1.2351 |
32 | 0.1132 | 72 | 1.015 | 112 | 1.2367 |
33 | 0.1198 | 73 | 1.0267 | 113 | 1.2384 |
34 | 0.1264 | 74 | 1.0383 | 114 | 1.24 |
35 | 0.133 | 75 | 1.05 | 115 | 1.2417 |
36 | 0.1396 | 76 | 1.0568 | 116 | 1.2434 |
37 | 0.1462 | 77 | 1.0636 | 117 | 1.245 |
38 | 0.1528 | 78 | 1.0704 | 118 | 1.2467 |
39 | 0.1594 | 79 | 1.0772 | 119 | 1.2483 |
40 | 0.166 | 80 | 1.084 | 120 | 1.25 |
R = A + B - (A x B)/100 | ||
Where: | ||
R | = | Total TSS percent load removal from application of both BMPs; and |
A | = | The TSS percent removal rate applicable to the first BMP; |
B | = | The TSS percent removal rate applicable to the second BMP. |
Table 5. Current Precipitation Adjustment Factors | |||
|---|---|---|---|
County | Current Precipitation Adjustment Factors | ||
2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
Burlington | 0.99 | 1.01 | 1.04 |
Ocean | 1.00 | 1.01 | 1.03 |
Table 6. Future Precipitation Change Factors | |||
|---|---|---|---|
County | Future Precipitation Change Factors | ||
2-year Design Storm | 10-year Design Storm | 100-year Design Storm | |
Burlington | 1.17 | 1.18 | 1.32 |
Ocean | 1.18 | 1.19 | 1.24 |
Parcel Size | RD-1, RD-2 Districts | FA District |
|---|---|---|
<50 acres | 0 | 0 |
50-99.99 acres | 10% | 20% |
100-149.99 acres | 15% | 25% |
>=150 acres | 20% | 30% |