22 CAR § 111-1104
22 CAR § 111-1104. Standards for drainage channels
Length: 50 wordsOfficial source
CONDITIONS
MAXIMUM
MINIMUM
PREFERRED
Swale side slopes
10%
10:1
1%
100:1
2%
Longitudinal slope of swales-grass invert
8%
12:1
1%
100:1
2%
Longitudinal slope of swales-paved invert
12%
8.3:1
0.5%
200:1
5%
Ditch side slope-grass invert
8%
12:1
1%
100:1
3%
Ditch side slope-paved invert
10%
10:1
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6%