Watershed Management
Stream Crossing Structures
Size Required Culvert Dia (in)
Area(ft2)
Area Above Crossing Acres
18
1.76
7 or less
21
2.40
12
24
3.14
16
30
4.90
27
36
7.06
47
42
9.62
64
48
12.56
90
54
15.90
120
60
19.63
160
66
23.75
205
72
28.75
250
78
33.18
350