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

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)
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.

18-29-1107 Deliberately omitted.

18-29-1108 Combined Sanitary and Storm System.

18-29-1108.1 Size of combined drains and sewers.

   Whenever a combined sewer system is employed, the required size of the combined house sewer shall be determined by adding the total drained area in square feet in Table 18-29-1106.2 and equivalent area for the number of fixture units in accordance with Table 18-29-1108.1.

Table 18-29-1108.1
Combined Sanitary and Storm System

No. of Fixture Units	Equivalent Area (sq. ft.)	No. of Fixture Units	Equivalent Area (sq. ft.)*
1	165	31	2,820
2	325	32	2,870
3	475	34	2,955
5	750	38	3,125
6	875	40	3,200
7	1,000	42	3,270
8	1,115	44	3,340
9	1,225	46	3,400
10	1,330	48	3,465
11	1,435	50	3,350
12	1,530	55	3,530
13	1,620	60	3,790
14	1,710	65	3,900
15	1,800	70	4,000
16	1,880	75	4,090
17	1,960	80	4,175
18	2,040	85	4,250
19	2,110	90	4,320
20	2,180	95	4,390
21	2,250	100	4,450
22	2,310	105	4,500
23	2,360	110	4,550
24	2,440	115	4,600
25	2,500	120	4,645
26	2,550	125	4,690
27	2,600	130	4,725
28	2,660	140	4,800
29	2,710	145	4,830
30	2,770	150	4,850

 

* For more than 150 fixture units, the equivalent area shall be determined by adding 7.2 square feet for each fixture unit over 150 to 4,850 square feet.

18-29-1109 Values for Continuous Flow.

18-29-1109.1 Equivalent roof area.

   Where there is a continuous or semi-continuous discharge into the building storm drain or building storm sewer, such as from a pump, ejector, air conditioning plant or similar device, each gallon per minute (L/m) of such discharge shall be computed as being equivalent to 24 square feet (2.25 m 2 ) of roof area. (See Table 18-29-1108.1)

18-29-1110 Controlled Flow Roof Drain Systems.