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18-29-1106.6  Size of roof gutters.
   The size of semicircular gutters shall be based on the maximum projected roof area in accordance with Table 18-29-1106.6.
Table 18-29-1106.3
Size of Horizontal Storm Drainage Piping
For a printer-friendly PDF version of Table 18-29-1106.3, please click here.
Pipe Size
1/8 Unit Vertical in 12 Units Horizontal (1-percent slope)
1/4 Unit Vertical in 12 Units Horizontal (2-percent slope)
1/2 Unit Vertical in 12 Units Horizontal (4-percent slope)
Square Feet
Square Feet
Square Feet
Pipe Size
1/8 Unit Vertical in 12 Units Horizontal (1-percent slope)
1/4 Unit Vertical in 12 Units Horizontal (2-percent slope)
1/2 Unit Vertical in 12 Units Horizontal (4-percent slope)
Square Feet
Square Feet
Square Feet
3
822
1,160
1,644
4
1,800
2,650
3,760
5
3,340
4,720
6,680
6
5,350
7,550
10,700
8
11,500
16,300
23,000
10
20,700
29,200
41,400
12
33,300
47,000
66,600
15
599,500
84,000
119,000
 
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2
(Amend Coun. J. 4-15-15, p. 106130, § 24)
Table 18-29-1106.6
Size of Semicircular Roof Gutters
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
1/16 Unit Vertical in 12 Units Horizontal (0.5-percent slope)
1/8 Unit Vertical in 12 Units Horizontal (1-percent slope)
1/4 Unit Vertical in 12 Units Horizontal (2-percent slope)
1/2 Unit Vertical in 12 Units Horizontal (4-percent slope)
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
Diameter of Gutters (inches)
Square Feet
1/16 Unit Vertical in 12 Units Horizontal (0.5-percent slope)
1/8 Unit Vertical in 12 Units Horizontal (1-percent slope)
1/4 Unit Vertical in 12 Units Horizontal (2-percent slope)
1/2 Unit Vertical in 12 Units Horizontal (4-percent slope)
3
170
3
240
3
340
3
480
4
360
4
510
4
720
4
1,020
5
625
5
880
5
1,250
5
1,770
6
960
6
1,360
6
1,920
6
2,770
7
1,380
7
1,950
7
2,760
7
3,900
8
1,990
8
2,800
8
3,980
8
5,600
10
3,600
10
5,100
10
7,200
10
10,000
 
For SI: 1 inch = 25.4 mm, 1 square foot = 0.929 m 2