5. S T A N D A R D S

6. AS/NZS :1994
Specifications for rainwater goods, accessories and fasteners
Part 1: Metal shape or sheet rainwater goods, and metal accessories and fasteners
AS :1998
National plumbing and drainage
Part 3.1: Stormwater drainage - Performance requirements
AS/NZS :1998
National plumbing and drainage
Part 3.2: Stormwater drainage - Acceptable solutions

7. Specifications for rainwater goods, accessories and fasteners
AS/NZS :1994
Specifications for rainwater goods, accessories and fasteners
Part 1: Metal shape or sheet rainwater goods, and metal accessories and fasteners
1.1 SCOPE This Standard specifies requirements for pre-painted metal, metal and organic film/metal laminated shape or sheet rainwater goods, and metal accessories and fasteners.
3.8 EFFECTIVE CROSS-SECTIONALAREA The effective cross-sectional area (to the nearest 100 mm²) for each nominal size of eaves gutter, valley gutter and downpipe shall be supplied by the manufacturer. The effective cross-sectional area for each shall be as follows:
(a) For an eaves gutter and support system—
(i) it is the cross-sectional area beneath a line not less than 10 mm below the overflow, e.g. front bead, gutter back or bottom of overflow slots; or
4.1 GENERAL One or more of the performance tests shall be used to demonstrate the compliance of a gutter or downpipe and support system

8. National plumbing and drainage
AS :1998
National plumbing and drainage
Part 3.1: Stormwater drainage - Performance requirements
1 SCOPE This Standard specifies the performance requirements for materials and products, and design and installation of roof drainage systems, surface drainage systems and subsoil drainage systems.

9. National plumbing and drainage
AS :1998
National plumbing and drainage
Part 3.1: Stormwater drainage - Performance requirements
6 PERFORMANCE REQUIREMENTS
6.1 Roof drainage systems
6.1.1 Average recurrence interval (ARI) Roof drainage systems shall be designed and installed in accordance with the following:
(a) Where it is unlikely that adverse effects of stormwater flows would result in significant inconvenience or injury to people or damage to property, for rainfall events having an ARI of not less than 20 years.
(b) Where it is likely that adverse effects of stormwater flows would result in significant inconvenience or injury to people or damage to property, for rainfall events having an ARI of not less than 100 years.
6.1.2 Overflow devices or measures Overflow devices or measures shall be installed where overtopping of the roof drainage system could cause significant monetary loss, property damage or personal injury, and shall be designed in accordance with Clause 6.1.1(b) taking into account the effect of obstructions and blockages.

11. primary referenced Standard Building Code of Australia
AS/NZS :1998
Australian/New Zealand Standard TM
National plumbing and drainage
Part 3.2: Stormwater drainage -Acceptable solutions
primary referenced Standard
Building Code of Australia

12. SECTION 3 ROOF DRAINAGE SYSTEMS - DESIGN
AS/NZS :1998
SECTION 3 ROOF DRAINAGE SYSTEMS - DESIGN

13. AVERAGE RECURRENCE INTERVAL
ARI = 20 years
TABLE 3.1
AVERAGE RECURRENCE INTERVAL

14. rainfall intensity = 210 mm/h
ARI = 20 years
rainfall intensity = 210 mm/h
(PART OF) FIGURE E4 AREA 2 - RAINFALL INTENSITIES (mm/h)
FOR 5 MINUTES DURATION AND AN ARI OF 20 YEARS
210
SYDNEY

15. rainfall intensity = 210 mm/h 15 x 8 = 120 + 6 x 4 = 24 (Ah) 144 m²
ARI = 20 years 15 9 6 8 4 12
Pitch 23.5°
rainfall intensity = 210 mm/h
15 x 8 = 120
+ 6 x 4 = 24
(Ah) 144 m²
Pitch 23.5°

16. rainfall intensity = 210 mm/h ARI = 20 years
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
ARI = 20 years 5 15 20 25 30 35 10 40 45 50 55 1
1.1
1.6
1.7
1.5
1.4
1.3
1.2
1.8
1.9
VALUES OF (F)
SLOPE OF ROOF GUTTERS (DEGREES)
FIGURE 3.4 CATCHMENT AREA - SLOPE FACTOR, F, (FOR EAVES GUTTER ONLY)
x 1.2 (F)
(Ac) 174 m²
1.21
23.5

17. rainfall intensity = 210 mm/h
x 1.2 (F)
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
(Ac) 174 m²
ARI = 20 years
4.8 EAVES GUTTERS Eaves gutters shall be installed as follows:
(a) Gradients Deviations from nominal gradients shall be smooth and
not cause permanent ponding.
NOTES:
1. Where a building is likely to move due to reactive soils, gradients may need to be not flatter than -
(a) 1:250 to achieve an effective gradient not flatter than 1:500; or
(b) 1:500 to achieve an effective gradient with no permanent ponding.
Gradient 1 : 500
Smoothline Ae = 5900 mm²
10 mm minimum
5900 mm²

18. rainfall intensity = 210 mm/h
x 1.2 (F)
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
(Ac) 174 m²
Gradient 1 : 500
Smoothline Ae = 5900 mm²
ARI = 20 years
0.68
1.0
2.0
3.0
4.0
5.0
6.0
6.38
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
5.3
9.4
10.7
13.4
6.7
14.7
17.4
18.7
20.1
21.4
22.7
24.1 10 60 70 50 40 30 20 80 90
100
EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²
FOR GRADIENTS OF 1 : 500 AND STEEPER
CATCHMENT AREA PER VERTICAL DOWNPIPE (Ac) m²
FOR GRADIENTS FLATTER THAN 1 : 500
TOTAL FLOW IN EAVES GUTTER (L / s)
DESIGN RAINFALL INTENSITY mm / h
FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS 50
100
350
400
300
250
200
150
450
500

19. rainfall intensity = 210 mm/h
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
x 1.2 (F)
Gradient 1 : 500
(Ac) 174 m²
Smoothline Ae = 5900 mm²
ARI = 20 years
EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²
FOR GRADIENTS FLATTER THAN 1 : 500
4.0
5.3
8.0
9.4
10.7
12.0
13.4
6.7
14.7
16.0
17.4
18.7
20.1
21.4
22.7
24.1 10 60 70 50 40 30 20 80 90
100 50
100
350
400
300
250
200
150
450
500
CATCHMENT AREA PER VERTICAL DOWNPIPE (Ac) m²
Acdp = 28 m² 28
min number of downpipes
174 / 28 = 7
DESIGN RAINFALL INTENSITY mm / h
5.9
3.0
4.0
6.0
7.0
8.0
9.0
10.0
5.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²
FOR GRADIENTS OF 1 : 500 AND STEEPER
0.68
1.0
2.0
3.0
4.0
5.0
6.0
6.38
TOTAL FLOW IN EAVES GUTTER (L / s)
FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS

20. rainfall intensity = 210 mm/h
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
(Ac) 174 m²
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years 15 9 6 8 4 12
Pitch 23.5°
DP - E HP
DP - D HP
DP - C
24 m²
28 m²
25 m² HP HP
DP - B
DP - F HP
DP - G HP
DP - A HP

21. EAVES GUTTER—REQUIRED SIZE OF VERTICAL DOWNPIPE
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
(Ac) 174 m²
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
TABLE 3.2
EAVES GUTTER—REQUIRED SIZE OF VERTICAL DOWNPIPE
min downpipe size = 85 dia

22. rainfall intensity = 210 mm/h
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
(Ac) 174 m²
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
min downpipe size = 85 dia 15 9 6 8 4 12
Pitch 23.5° HP
DP - A
DP - B
DP - C
DP - D
DP - E
DP - F
DP - G
24 m²
28 m²
25 m²
As-c (downpipe G) = 28 m²

23. rainfall intensity = 210 mm/h
As-c (downpipe G) = 28 m²
(Ac) 174 m²
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
min downpipe size = 85 dia
0.68
1.0
2.0
3.0
4.0
5.0
6.0
6.38
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
5.3
9.4
10.7
13.4
6.7
14.7
17.4
18.7
20.1
21.4
22.7
24.1 10 60 70 50 40 30 20 80 90
100
EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²
FOR GRADIENTS OF 1 : 500 AND STEEPER
CATCHMENT AREA PER VERTICAL DOWNPIPE (Ac) m²
FOR GRADIENTS FLATTER THAN 1 : 500
TOTAL FLOW IN EAVES GUTTER (L / s)
350
400
300
250
200
150
450
500
DESIGN RAINFALL INTENSITY mm / h
FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS 28
total flow = 1.65 L/s
1.65

24. rainfall intensity = 210 mm/h
total flow = 1.65 L/s
As-c (downpipe G) = 28 m²
(Ac) 174 m²
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
min downpipe size = 85 dia 15 9 6 8 4 12
Pitch 23.5° HP
DP - A
DP - B
DP - C
DP - D
DP - E
DP - F
DP - G
24 m²
28 m²
25 m² 4
Length of gutter (G) = 4 m
Ave flow per metre of gutter
1.65 / 4 = 0.4 L / s

25. Ave flow per metre of gutter Length of gutter (G) = 4 m
1.65 / 4 = 0.4 L / s
Ave flow per metre of gutter
Length of gutter (G) = 4 m
total flow = 1.65 L/s
As-c (downpipe G) = 28 m²
(Ac) 174 m²
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
min downpipe size = 85 dia hf
10 mm min
30 mm min
flashing
TABLE G1
MINIMUM hf VALUES
hf = 14 mm

26. hf = 14 mm
1.65 / 4 = 0.4 L / s
Ave flow per metre of gutter
Length of gutter (G) = 4 m
total flow = 1.65 L/s
As-c (downpipe G) = 28 m²
(Ac) 174 m²
+ 6 x 4 = 24
15 x 8 = 120
(Ah) 144 m²
rainfall intensity = 210 mm/h
x 1.2 (F)
Gradient 1 : 500
Smoothline Ae = 5900 mm²
Acdp = 28 m²
174 / 28 = 7
min number of downpipes
ARI = 20 years
min downpipe size = 85 dia

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