In the case of development of agricultural land, development
means: any activity that requires a State permit, any activity reviewed
by the County Agricultural Board (CAB) and the State Agricultural
Development Committee (SADC), and municipal review of any activity
not exempted by the Right to Farm Act, N.J.S.A 4:1C-1 et seq.
|
Major development includes all developments that are part of a common plan of development or sale (for example, phased residential development) that collectively or individually meet any one or more of subsections A, B, C or D above. Projects undertaken by any government agency that otherwise meet the definition of "major development" but which do not require approval under the Municipal Land Use Law, N.J.S.A. 40:55D-1 et seq., are also considered "major development."
|
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 to 80
|
No
|
No
|
—
|
(Notes corresponding to annotations (a) through (g) are found following Table
3)
|
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
(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 to 90
|
Yes
|
No
|
N/A
|
(Notes corresponding to annotations (b) through (d) are found following Table
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.
7:8-5.3
| ||||
---|---|---|---|---|
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
|
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 to 90
|
Yes
|
No
|
N/A
|
Notes to Tables 1, 2, and 3:
| |
(a)
|
Subject to the applicable contributory drainage area limitation specified at § 321-4O(2);
|
(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 § 321-2;
|
(h)
|
Manufactured treatment devices that do not meet the definition of green infrastructure at § 321-2.
|
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
|
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
|
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
|
Examples of grates subject to this standard include
grates in grate inlets, the grate portion (non-curb-opening portion)
of combination inlets, grates on storm sewer manholes, ditch grates,
trench grates, and grates of spacer bars in slotted drains. Examples
of ground surfaces include surfaces of roads (including bridges),
driveways, parking areas, bikeways, plazas, sidewalks, lawns, fields,
open channels, and stormwater system floors used to collect stormwater
from the surface into a storm drain or surface water body.
|
Note that these exemptions do not authorize any infringement
of requirements in the Residential Site Improvement Standards for
bicycle safe grates in new residential development (N.J.A.C. 5:21-4.18(b)2
and 7.4(b)1).
|