In the case of development on agricultural land, i.e., lands
use for an agricultural use or purpose as defined at N.J.A.C. 7:50-2.11,
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.
|
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(c)
| |||
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 § 298-3N(2).
|
(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 § 298-2.
|
(h)
|
Manufactured treatment devices that do not meet the definition of green infrastructure at § 298-2.
|
(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
(acres)
|
---|---|
Dry well
|
1
|
Manufactured treatment device
|
2.5
|
Pervious pavement system
|
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
|
0.0083
|
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.
|
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
|
Camden
|
1.03
|
1.04
|
1.05
|
Gloucester
|
1.05
|
1.06
|
1.06
|
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
|
Camden
|
1.18
|
1.22
|
1.39
|
Gloucester
|
1.19
|
1.23
|
1.41
|