Minimum Angle Chart For Standard Basins - Harco Fittings
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1Minimum Angle Chart
8" - 36" Standard Drain Basins,
8" - 30" Curb Inlet Structures, and Traffic Structures.
Does not apply to Basins with a Snout, Weir, or Branch Adders
Effective 10/5/11
Basin Size
Adaptor
Size
8"
10"
12"
15"
18"
24"
30"
36"
4" - 4"
70
55
50
42
35
25
24
21
4" - 6"
75
70
55
47
40
29
25
23
4" - 8"
100
80
65
55
45
35
28
26
4" - 10"
95
75
62
52
40
32
28
4" - 12"
85
70
55
45
40
30
4" - 15"
80
65
51
44
33
4" - 18"
76
60
50
36
4" - 24"
75
62
41
4" - 30"
75
45
6" - 6"
90
75
65
55
44
33
30
26
6" - 8"
115
85
75
63
51
39
34
29
6" - 10"
105
85
70
55
43
38
32
6" - 12"
95
75
63
48
45
34
6" - 15"
86
72
56
48
37
6" - 18"
84
63
55
40
6" - 24"
77
66
46
6" - 30"
75
51
8" - 8"
165
90
80
70
55
44
35
32
8" - 10"
115
88
76
63
48
45
35
8" - 12"
102
83
70
52
48
38
8" - 15"
95
78
60
55
41
8" - 18"
90
70
60
45
8" - 24"
82
70
51
8" - 30"
80
57
10" - 10"
160
90
82
70
53
48
38
10" - 12"
115
85
75
58
50
41
10" - 15"
103
85
65
58
45
10" - 18"
97
72
65
49
10" - 24"
88
75
56
10" - 30"
85
62
12" - 12"
150
90
82
64
56
44
12" - 15"
112
87
69
60
48
12" - 18"
102
78
68
53
12" - 24"
92
80
60
12" - 30"
90
67
15" - 15"
150
90
77
69
53
15" - 18"
110
84
75
58
15" - 24"
98
85
66
15" - 30"
96
73
18" - 18"
150
90
78
63
18" - 24"
108
88
72
18" - 30"
100
82
24" - 24"
150
90
81
24" - 30"
115
91
30" - 30"
150
101
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