Curva numerica

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65

Description
FULLY DEVELOPED URBAN AREAS
Open space (lawns, parks, etc.)
grass cover < 50%
grass cover 50% to 75%
grasscover > 75%
Impervious Areas
Paved parking lots, roofs, driveways
Streets and roads
Paved: curbs and storm sewers
Paved: open ditches (with right‐of‐way)
Gravel (with right‐of‐way)
Dirt (with right‐of‐way)
Urban Districts
Commercial & business
Industrial
Residential Districts
(by average lot size)
1/8 acre (town houses)
1/4 acre1/3 acre
1/2 acre
1 acre
2 acre
Western Desert Urban Areas
Natural desert (pervious areas only)
Artificial desert landscaping
DEVELOPING URBAN AREA
Newly graded area (pervious only)
CULTIVATED AGRICULTURAL LAND
Fallow
Bare soil
Crop residue (CR)
Crop residue (CR)
Row crops
Straight row (SR)
Straight row (SR)
SR + Cropresidue
SR + Crop residue
Contoured (C)
Contoured (C)
C + Crop residue
C + Crop residue
Contoured & terraced (C&T)
Contoured & terraced (C&T)
C&T + Crop residue
C&T + Crop residue
Small grain
Straight row (SR)
Straight row (SR)
SR + Crop residue
SR + Crop residue
Contoured (C)
Contoured (C)
C + Crop residue
C + Cropresidue
Contoured & terraced (C&T)
Contoured & terraces (C&T)
C&T + Crop residue
C&T + Crop residue
Close‐seeded legumes/rotated meadow
Straight row
Straight row
Contoured
Contoured
Contoured & terraced

Condition
Vegetation

ABCD

Condensed Description

Poor
Fair
Good

68 79 86 89 < 50% grass cover
49 69 79 84 50 ‐ 75% grass cover
3961 74 80 > 75% grass cover
98 98 98 98 Paved parking & roofs

50% imp

98
83
76
72

98
89
85
82

98
92
89
87

98
93
91
89

Paved roads with curbs & sewers
Paved roads with open ditches
Gravel roads
Dirt roads

impervious
85% imp
72% imp

89 92 94 95 Urban commercial
81 88 91 93 Urban industrial

impervious
65% impervious
38% impervious
30% impervious
25%impervious
20% impervious
12% impervious

77
61
57
54
51
46

85
75
72
70
68
65

90
83
81
80
79
77

92
87
86
85
84
82

1/8 acre lots
1/4 acre lots
1/3 acre lots
1/2 acre lots
1 acre lots
2 acre lots

63 77 85 88 Natural western desert
96 96 96 96 Artificial desert landscape
(No Vegetation)
77 86 91 94 Newly graded area

Poor
Good

77 86 91 94 Fallow,bare soil
76 85 90 93 Fallow, crop residue
74 83 88 90 Fallow, crop residue

Poor
Good
Poor
Good
Poor
Good
Poor
Good
Poor
Good
Poor
Good

72
67
71
64
70
65
69
64
66
62
65
61

81
78
80
75
79
75
78
74
74
71
73
70

88
85
87
82
84
82
83
81
80
78
79
77

91
89
90
85
88
86
87
85
82
81
81
80

Row crops, straight row
Row crops, straight rowRow crops, SR + CR
Row crops, SR + CR
Row crops, contoured
Row crops, contoured
Row crops, C + CR
Row crops, C + CR
Row crops, C&T
Row crops, C&T
Row crops, C&T + CR
Row crops, C&T + CR

Poor
Good
Poor
Good
Poor
Good
Poor
Good
Poor
Good
Poor
Good

65
63
64
60
63
61
62
60
61
59
60
58

76
75
75
72
74
73
73
72
72
70
71
69

84
83
83
80
82
81
8180
79
78
78
77

88
87
86
84
85
84
84
83
82
81
81
80

Small grain, straight row
Small grain, straight row
Small grain, SR + CR
Small grain, SR + CR
Small grain, contoured
Small grain, contoured
Small grain, C + CR
Small grain, C + CR
Small grain, C&T
Small grain, C&T
Small grain, C&T + CR
Small grain, C&T + CR

Poor
Good
Poor
Good
Poor

66
58
64
55
63...