500 General Provisions and Design Standards
Design Speed Of The Uncontrolled Street | Minimum Required Sight Distance |
|---|---|
25 mph | 250 feet |
30 mph | 300 feet |
35 mph | 350 feet |
40 mph | 400 feet |
45 mph | 450 feet |
50 mph | 500 feet |
Notes: | 1. Highest point of nonresidential building or structure includes roof equipment and appurtenances. |
2. Landscaping and buffer screening having a minimum width of 100 feet shall be applied when adjoining residential zones and residential uses in residential zones. |
Angle Of Parking Space | One-Way Aisle/Driveway | Two-Way Aisle/Driveway |
|---|---|---|
90° | Not Permitted | 24 feet |
60° | 18 feet | Not Permitted |
45° | 15 feet | Not Permitted |
30° | 12 feet | Not Permitted |
Parallel | 12 feet | 20 feet |
Roadway Category | R-O-W Width (1) | Traffic No. | Lanes Width | Shoulder Width in Cartway | Width Outside Cartway(2) | Width of Cartway |
|---|---|---|---|---|---|---|
Major Collector (3) | 60 feet | 2 | 12 feet each | 7 feet, Not Always Paved (4)(5) | 11 feet Each Side | 38 feet |
Minor Collector (3) | 54 feet | 2 | 11 feet each | 5 feet, Not Always Paved (4)(5) | 11 feet Each Side | 32 feet |
Rural Local (3) | 50 feet | 2 | 11 feet each | 3 feet, Not Always Paved (4)(5) | 11 feet Each Side | 28 feet |
Neighborhood Local (6) | 50 feet | 2 | 15 feet each | Not Applicable | 10 feet Each Side | 30 feet |
Seven Footnotes To Proposed Roadway Design Specifications: | ||
|---|---|---|
(1) | The "Right-Of-Way Width" and/or "Cartway Width" may be required to be wider within and approaching intersections. | |
a) | The "Right-Of-Way Width" includes the paved traffic lanes, the shoulders and the land area outside the shoulders where sidewalks, street trees and other such public improvements may be located when required by Ordinance. | |
b) | The "Cartway Width" includes the paved traffic lanes and the shoulders, whether or not paved in accordance with Footnote (4) hereinbelow. | |
(2) | The area outside the Cartway on both sides of the road shall be grass stabilized topsoil at least 4 inches thick except and in accordance with the following: | |
a) | Sidewalks and bike lanes shall be located within this land area as may be required by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
b) | Street trees and other landscaping shall be planted in this land area also as required by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
(3) | No on-street parking is permitted. | |
(4) | Shoulder areas shall not be paved except as may be required by the Planning Board or Zoning Board of Adjustment, as the case may be, for proper surface water drainage, intersection traffic movements and/or road geometry through curves. | |
a) | Where not required to be paved, the shoulder area shall remain in its natural vegetative state; or, | |
b) | Where directed by the Township Engineer, the shoulder area shall be cleared for sight distance safety purposes, be improved for drainage purposes, and/or be cleared, graded and appropriately stabilized with an all-weather surface for traffic movements and/or the parking of disabled vehicles. | |
(5) | Where required by the Planning Board or Zoning Board of Adjustment, as the case may be, bike lanes at least 4 feet in width shall be provided adjacent the traffic lanes, within the required shoulder width, and on both sides on the roadway. Such lanes shall be appropriately signed and marked, in accordance with the New Jersey Department of Transportation's "Bicycle Compatible Roadways And Bikeways Planning And Design Guidelines". | |
(6) | Streets within a "Planned Development" not otherwise specified on the Traffic Circulation Plan Map shall ordinarily be considered "Neighborhood Local" streets, except for the major streets within the development expected by the Planning Board or Zoning Board of Adjustment, as the case may be, to carry relatively significant volumes of traffic; such major streets shall meet the standards herein for "Minor Collector" streets. | |
(7) | Except in specific instances where a pavement width of 28 feet may be appropriate and parking is permitted only on 1 side, as approved by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
Major Collector Streets: | 35 feet; |
Minor Collector Streets: | 30 feet; and |
Neighborhood Local & Rural Local Streets: | 25 feet |
Table A Design Standards for Peak Hour Flow | |
|---|---|
Total Houses Served | Peak Hourly Rates GPM per House |
5 | 8.0 |
10 | 5.0 |
50 | 3.0 |
100 | 2.0 |
250 | 1.3 |
500 | 0.8 |
750 | 0.7 |
1,000 or More | 0.6 |
Table B Fire Flows | ||
|---|---|---|
Population | Flow GPM | Duration Flow Hour |
Under 100 | 500 | 4 |
1,000 | 1,000 | 4 |
1,500 | 1,250 | 5 |
2,000 | 1,500 | 6 |
3,000 | 1,750 | 7 |
4,000 | 2,000 | 8 |
5,000 | 2,250 | 9 |
6,000 | 2,500 | 10 |
10,000 | 3,000 | 10 |
Table C Short Method for Calculating Fire Flows | |
|---|---|
Distance Between Buildings | Required Fire Flow |
OVER 100 FEET | 500 GPM |
31 FEET - 100 FEET | 750 GPM - 1,000 GPM |
11 FEET - 30 FEET | 1,000 GPM - 1,500 GPM |
10 FEET OR LESS | 1,500 GPM - 2,000 GPM |
Table D Color Code System for Fire Hydrants |
|---|
CLASS "A": 1,000 GPM or greater and water mains of 10 inches and greater: Green Caps and Bonnets |
CLASS "B": Greater than 500 GPM but less than 1,000 GPM and water mains of at least 8 inches but less than 10 inches: Orange Caps and Bonnets |
CLASS "C": 500 GPM or less and water mains of at least 6 inches but less than 8 inches: Red Caps and Bonnets |
BARRELS: All fire hydrants shall be red or equivalent |
Table E Maximum Leakage | |
|---|---|
Pipe Diameter | Leakage Limit vs. Gallon |
6 inches | 0.50 |
8 inches | 0.67 |
10 inches | 0.84 |
12 inches | 1.01 |
14 inches | 1.18 |
16 inches | 1.34 |
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 | 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% to 80% | No | No | — |
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. 7:8-5.3) | ||||
|---|---|---|---|---|
Best Management Practice | Stormwater Runoff Quality TSS Removal Rate | 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% to 90% | Yes | No | N/A |
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. 7:8-5.3 | ||||
|---|---|---|---|---|
Best Management Practice | Stormwater Runoff Quality TSS Removal Rate | 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 | 1 |
Manufactured treatment device(b) | 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% to 90% | Yes | No | N/A |
Notes to Tables 1, 2, and 3: | |
|---|---|
(a) | Subject to the applicable contributory drainage area limitation specified at § 35-521.4O2; |
(b) | Designed to infiltrate into the subsoil; |
(c) | Designed with underdrains; |
(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 § 35-521.2. |
(h) | Manufactured treatment devices that do not meet the definition of "green infrastructure" at § 35-521.2. |
Best Management Practice | Maximum Contributory Drainage Area (acres) |
|---|---|
Dry well | 1 |
Manufactured treatment device | 2.5 |
Pervious pavement systems | Area of additional inflow cannot exceed 3 times the area occupied by the BMP |
Small-scale bioretention systems | 2.5 |
Small-scale infiltration basin | 2.5 |
Small-scale sand filter | 2.5 |
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 |
R = A + B - (A x B)/100 | ||
Where: | ||
R | = | total TSS percent load removal from application of both BMPs. |
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 | |
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 |
Table 6: Future Precipitation Change Factors | |||
|---|---|---|---|
County | Future Precipitation Change Factors | ||
2-year Design Storm | 10-year Design Storm | 10-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 |
500 General Provisions and Design Standards
Design Speed Of The Uncontrolled Street | Minimum Required Sight Distance |
|---|---|
25 mph | 250 feet |
30 mph | 300 feet |
35 mph | 350 feet |
40 mph | 400 feet |
45 mph | 450 feet |
50 mph | 500 feet |
Notes: | 1. Highest point of nonresidential building or structure includes roof equipment and appurtenances. |
2. Landscaping and buffer screening having a minimum width of 100 feet shall be applied when adjoining residential zones and residential uses in residential zones. |
Angle Of Parking Space | One-Way Aisle/Driveway | Two-Way Aisle/Driveway |
|---|---|---|
90° | Not Permitted | 24 feet |
60° | 18 feet | Not Permitted |
45° | 15 feet | Not Permitted |
30° | 12 feet | Not Permitted |
Parallel | 12 feet | 20 feet |
Roadway Category | R-O-W Width (1) | Traffic No. | Lanes Width | Shoulder Width in Cartway | Width Outside Cartway(2) | Width of Cartway |
|---|---|---|---|---|---|---|
Major Collector (3) | 60 feet | 2 | 12 feet each | 7 feet, Not Always Paved (4)(5) | 11 feet Each Side | 38 feet |
Minor Collector (3) | 54 feet | 2 | 11 feet each | 5 feet, Not Always Paved (4)(5) | 11 feet Each Side | 32 feet |
Rural Local (3) | 50 feet | 2 | 11 feet each | 3 feet, Not Always Paved (4)(5) | 11 feet Each Side | 28 feet |
Neighborhood Local (6) | 50 feet | 2 | 15 feet each | Not Applicable | 10 feet Each Side | 30 feet |
Seven Footnotes To Proposed Roadway Design Specifications: | ||
|---|---|---|
(1) | The "Right-Of-Way Width" and/or "Cartway Width" may be required to be wider within and approaching intersections. | |
a) | The "Right-Of-Way Width" includes the paved traffic lanes, the shoulders and the land area outside the shoulders where sidewalks, street trees and other such public improvements may be located when required by Ordinance. | |
b) | The "Cartway Width" includes the paved traffic lanes and the shoulders, whether or not paved in accordance with Footnote (4) hereinbelow. | |
(2) | The area outside the Cartway on both sides of the road shall be grass stabilized topsoil at least 4 inches thick except and in accordance with the following: | |
a) | Sidewalks and bike lanes shall be located within this land area as may be required by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
b) | Street trees and other landscaping shall be planted in this land area also as required by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
(3) | No on-street parking is permitted. | |
(4) | Shoulder areas shall not be paved except as may be required by the Planning Board or Zoning Board of Adjustment, as the case may be, for proper surface water drainage, intersection traffic movements and/or road geometry through curves. | |
a) | Where not required to be paved, the shoulder area shall remain in its natural vegetative state; or, | |
b) | Where directed by the Township Engineer, the shoulder area shall be cleared for sight distance safety purposes, be improved for drainage purposes, and/or be cleared, graded and appropriately stabilized with an all-weather surface for traffic movements and/or the parking of disabled vehicles. | |
(5) | Where required by the Planning Board or Zoning Board of Adjustment, as the case may be, bike lanes at least 4 feet in width shall be provided adjacent the traffic lanes, within the required shoulder width, and on both sides on the roadway. Such lanes shall be appropriately signed and marked, in accordance with the New Jersey Department of Transportation's "Bicycle Compatible Roadways And Bikeways Planning And Design Guidelines". | |
(6) | Streets within a "Planned Development" not otherwise specified on the Traffic Circulation Plan Map shall ordinarily be considered "Neighborhood Local" streets, except for the major streets within the development expected by the Planning Board or Zoning Board of Adjustment, as the case may be, to carry relatively significant volumes of traffic; such major streets shall meet the standards herein for "Minor Collector" streets. | |
(7) | Except in specific instances where a pavement width of 28 feet may be appropriate and parking is permitted only on 1 side, as approved by the Planning Board or Zoning Board of Adjustment, as the case may be. | |
Major Collector Streets: | 35 feet; |
Minor Collector Streets: | 30 feet; and |
Neighborhood Local & Rural Local Streets: | 25 feet |
Table A Design Standards for Peak Hour Flow | |
|---|---|
Total Houses Served | Peak Hourly Rates GPM per House |
5 | 8.0 |
10 | 5.0 |
50 | 3.0 |
100 | 2.0 |
250 | 1.3 |
500 | 0.8 |
750 | 0.7 |
1,000 or More | 0.6 |
Table B Fire Flows | ||
|---|---|---|
Population | Flow GPM | Duration Flow Hour |
Under 100 | 500 | 4 |
1,000 | 1,000 | 4 |
1,500 | 1,250 | 5 |
2,000 | 1,500 | 6 |
3,000 | 1,750 | 7 |
4,000 | 2,000 | 8 |
5,000 | 2,250 | 9 |
6,000 | 2,500 | 10 |
10,000 | 3,000 | 10 |
Table C Short Method for Calculating Fire Flows | |
|---|---|
Distance Between Buildings | Required Fire Flow |
OVER 100 FEET | 500 GPM |
31 FEET - 100 FEET | 750 GPM - 1,000 GPM |
11 FEET - 30 FEET | 1,000 GPM - 1,500 GPM |
10 FEET OR LESS | 1,500 GPM - 2,000 GPM |
Table D Color Code System for Fire Hydrants |
|---|
CLASS "A": 1,000 GPM or greater and water mains of 10 inches and greater: Green Caps and Bonnets |
CLASS "B": Greater than 500 GPM but less than 1,000 GPM and water mains of at least 8 inches but less than 10 inches: Orange Caps and Bonnets |
CLASS "C": 500 GPM or less and water mains of at least 6 inches but less than 8 inches: Red Caps and Bonnets |
BARRELS: All fire hydrants shall be red or equivalent |
Table E Maximum Leakage | |
|---|---|
Pipe Diameter | Leakage Limit vs. Gallon |
6 inches | 0.50 |
8 inches | 0.67 |
10 inches | 0.84 |
12 inches | 1.01 |
14 inches | 1.18 |
16 inches | 1.34 |
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 | 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% to 80% | No | No | — |
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. 7:8-5.3) | ||||
|---|---|---|---|---|
Best Management Practice | Stormwater Runoff Quality TSS Removal Rate | 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% to 90% | Yes | No | N/A |
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. 7:8-5.3 | ||||
|---|---|---|---|---|
Best Management Practice | Stormwater Runoff Quality TSS Removal Rate | 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 | 1 |
Manufactured treatment device(b) | 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% to 90% | Yes | No | N/A |
Notes to Tables 1, 2, and 3: | |
|---|---|
(a) | Subject to the applicable contributory drainage area limitation specified at § 35-521.4O2; |
(b) | Designed to infiltrate into the subsoil; |
(c) | Designed with underdrains; |
(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 § 35-521.2. |
(h) | Manufactured treatment devices that do not meet the definition of "green infrastructure" at § 35-521.2. |
Best Management Practice | Maximum Contributory Drainage Area (acres) |
|---|---|
Dry well | 1 |
Manufactured treatment device | 2.5 |
Pervious pavement systems | Area of additional inflow cannot exceed 3 times the area occupied by the BMP |
Small-scale bioretention systems | 2.5 |
Small-scale infiltration basin | 2.5 |
Small-scale sand filter | 2.5 |
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 |
R = A + B - (A x B)/100 | ||
Where: | ||
R | = | total TSS percent load removal from application of both BMPs. |
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 | |
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 |
Table 6: Future Precipitation Change Factors | |||
|---|---|---|---|
County | Future Precipitation Change Factors | ||
2-year Design Storm | 10-year Design Storm | 10-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 |