S T A N D A R D S S T A N D A R D S AS/NZS 3500.3.2:1998 National plumbing and drainage Part 3.2:...

S T A N D A R D SS T A N D A R D S

AS/NZS 3500.3.2:1998

National plumbing and drainage

Part 3.2: Stormwater drainage - Acceptable solutions

AS 3500.3.1:1998


Part 3.1: Stormwater drainage - Performance requirements

AS/NZS 2179.1:1994

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.

AS/NZS 2179.1:1994

Specifications for rainwater goods, accessories and fasteners

Part 1: Metal 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; or4.1 GENERAL One or more of the performance tests shall be used to demonstrate the compliance of a gutter or downpipe and support system

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.

AS 3500.3.1:1998



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.

AS 3500.3.1:1998



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.

AS/NZS 3500.3.2:1998


Part 3.2: Stormwater drainage -Acceptable solutions

Australian/New Zealand Standard TM

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AS/NZS 3500.3.2:1998

SECTION 3 ROOF DRAINAGE SYSTEMS - DESIGN

TABLE 3.1AVERAGE RECURRENCE INTERVAL

ARI, yearsEffect of overtoppingAustralia New Zealand

Where significant inconvenience orinjury to people or damage toproperty (including contents ofbuildings) is—

(a) an unlikely occurrence, e.g.eaves gutters, external; or

20 10

(b) a likely occurrence e.g. boxgutters

100 50

ARI = 20 years

ARI = 20 years

(PART OF) FIGURE E4 AREA 2 - RAINFALL INTENSITIES (mm/h)FOR 5 MINUTES DURATION AND AN ARI OF 20 YEARS

(PART OF) FIGURE E4 AREA 2 - RAINFALL INTENSITIES (mm/h)FOR 5 MINUTES DURATION AND AN ARI OF 20 YEARS

rainfall intensity = 210 mm/h


SYDNEYSYDNEY

210210

ARI = 20 years

ARI = 20 years

15

9 6

8

4

12

Pitch 23.5°

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



Pitch 23.5°Pitch 23.5°

ARI = 20 years

ARI = 20 years

23.523.5

1.211.21

00 55 1515 2020 2525 3030 35351010 4040 4545 5050 555511

1.11.1

1.61.6

1.71.7

1.51.5

1.41.4

1.31.3

1.21.2

1.81.8

1.91.9

VA

LU

ES

OF

(F

)V

AL

UE

S O

F (

F)

SLOPE OF ROOF GUTTERS (DEGREES)SLOPE OF ROOF GUTTERS (DEGREES)

FIGURE 3.4 CATCHMENT AREA - SLOPE FACTOR, F, (FOR EAVES GUTTER ONLY)FIGURE 3.4 CATCHMENT AREA - SLOPE FACTOR, F, (FOR EAVES GUTTER ONLY)

x 1.2 (F)

x 1.2 (F)

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



(Ac) 174 m²

(Ac) 174 m²

ARI = 20 years

ARI = 20 years

x 1.2 (F)

x 1.2 (F)

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



(Ac) 174 m²

(Ac) 174 m² Gradient

1 : 500Gradient

1 : 500Smoothline Ae = 5900 mm²

Smoothline Ae = 5900 mm²

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.

10 mm minimum

5900 mm²

ARI = 20 years

ARI = 20 years

x 1.2 (F)

x 1.2 (F)

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



(Ac) 174 m²

(Ac) 174 m² Gradient

1 : 500Gradient

1 : 500Smoothline Ae = 5900 mm²


0.680.68 1.01.0 2.02.0 3.03.0 4.04.0 5.05.0 6.06.0 6.386.38

3.03.0 4.04.0 6.06.0 7.07.0 8.08.0 9.09.0 10.010.05.05.0 11.011.0 12.012.0 13.013.0 14.014.0 15.015.0 16.016.0 17.017.0 18.018.0

4.04.0 5.35.3 8.08.0 9.49.4 10.710.7 12.012.0 13.413.46.76.7 14.714.7 16.016.0 17.417.4 18.718.7 20.120.1 21.421.4 22.722.7 24.124.1

00

1010

6060

7070

5050

4040

3030

2020

8080

9090

100100

EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²FOR GRADIENTS OF 1 : 500 AND STEEPER


CA

TC

HM

EN

T A

RE

A P

ER

VE

RT

ICA

L D

OW

NP

IPE

(A

c) m

²C

AT

CH

ME

NT

AR

EA

PE

R V

ER

TIC

AL

DO

WN

PIP

E (

Ac)

m²

EFFECTIVE CROSS-SECTIONAL AREA OF EAVES GUTTER (Ae) 1000 mm²FOR GRADIENTS FLATTER THAN 1 : 500


TOTAL FLOW IN EAVES GUTTER (L / s)TOTAL FLOW IN EAVES GUTTER (L / s)

DESIGN RAINFALL INTENSITY mm / hDESIGN RAINFALL INTENSITY mm / h

FIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERSFIGURE 3.6 REQUIRED SIZE OF EAVES GUTTERS

5050

100

100

350350400400300300250250

200200150150

450450 500500

ARI = 20 years

ARI = 20 years



+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²x 1.2

(F)x 1.2

(F)

Gradient 1 : 500

Gradient 1 : 500

(Ac) 174 m²

(Ac) 174 m²


Smoothline Ae = 5900 mm²Acdp = 28 m²Acdp = 28 m²

174 / 28 = 7

174 / 28 = 7

min number of downpipes


0.680.68 1.01.0 2.02.0 3.03.0 4.04.0 5.05.0 6.06.0 6.386.38

3.03.0 4.04.0 6.06.0 7.07.0 8.08.0 9.09.0 10.010.05.05.0 11.011.0 12.012.0 13.013.0 14.014.0 15.015.0 16.016.0 17.017.0 18.018.0

4.04.0 5.35.3 8.08.0 9.49.4 10.710.7 12.012.0 13.413.46.76.7 14.714.7 16.016.0 17.417.4 18.718.7 20.120.1 21.421.4 22.722.7 24.124.1

00

1010

6060

7070

5050

4040

3030

2020

8080

9090

100100



CA

TC

HM

EN

T A

RE

A P

ER

VE

RT

ICA

L D

OW

NP

IPE

(A

c) m

²C

AT

CH

ME

NT

AR

EA

PE

R V

ER

TIC

AL

DO

WN

PIP

E (

Ac)

m²




5050

100

100

350350400400300300250250

200200150150

450450 500500


5.95.9

2828


ARI = 20 years

ARI = 20 years

15

9 6

8

4

12

Pitch 23.5°HP

HP

HP

HP

HP

HP

HP

DP - A

DP - B

DP - C

DP - D

DP - E

DP - F

DP - G

24 m²24 m²

24 m²24 m²

24 m²24 m²

24 m²24 m²

28 m²28 m²

25 m²25 m²

25 m²25 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500

Gradient 1 : 500

(Ac) 174 m²

(Ac) 174 m²



174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years

min downpipe size = 85 dia


+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500

Gradient 1 : 500

(Ac) 174 m²

(Ac) 174 m²



174 / 28 = 7

174 / 28 = 7



Maximum effective cross-sectional area of aneaves gutter (Ae), see AS/NZS 2179.1.

(Required effective cross-sectional area isobtained from Figure 3.6)

Nearest 100 mm 2

Minimum nominal size of vertical downpipemm

Gradient Cross-section

1:500 and steeper Flatter than 1:500 Circular Rectangular or square

3 5004 2004 600

4 7005 6006 200

65—75

—65 × 50

—

4 8005 2005 900

6 4007 0007 900

—8085

75 × 50——

6 4006 6006 700

8 6008 9009 000

—90—

100 × 50—

75 × 70

8 2009 600

12 800

11 00012 90017 100

100—

125

—100 × 75

—

12 80016 00018 400

17 20021 50024 700

——

150

100 × 100125 × 100

—

19 20020 000

25 80026 800

——

150 × 100125 × 125

TABLE 3.2EAVES GUTTER—REQUIRED SIZE OF VERTICAL DOWNPIPE

ARI = 20 years

ARI = 20 years

15

9 6

8

4

12

Pitch 23.5°HP

HP

HP

HP

HP

HP

HP

DP - A

DP - B

DP - C

DP - D

DP - E

DP - F

DP - G

24 m²24 m²

24 m²24 m²

24 m²24 m²

24 m²24 m²

28 m²28 m²

25 m²25 m²

25 m²25 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500

Gradient 1 : 500

(Ac) 174 m²

(Ac) 174 m²



174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years


min downpipe size = 85 diaAs-c (downpipe G) = 28 m²

As-c (downpipe G) = 28 m²

0.680.68 1.01.0 2.02.0 3.03.0 4.04.0 5.05.0 6.06.0 6.386.38

3.03.0 4.04.0 6.06.0 7.07.0 8.08.0 9.09.0 10.010.05.05.0 11.011.0 12.012.0 13.013.0 14.014.0 15.015.0 16.016.0 17.017.0 18.018.0

4.04.0 5.35.3 8.08.0 9.49.4 10.710.7 12.012.0 13.413.46.76.7 14.714.7 16.016.0 17.417.4 18.718.7 20.120.1 21.421.4 22.722.7 24.124.1

00

1010

6060

7070

5050

4040

3030

2020

8080

9090

100100



CA

TC

HM

EN

T A

RE

A P

ER

VE

RT

ICA

L D

OW

NP

IPE

(A

c) m

²C

AT

CH

ME

NT

AR

EA

PE

R V

ER

TIC

AL

DO

WN

PIP

E (

Ac)

m²




5050

100

100

350350400400300300250250

200200150150

450450 500500



2828

1.651.65

total flow = 1.65 L/stotal flow = 1.65 L/sAs-c (downpipe G) =

28 m²As-c (downpipe G) =

28 m²

(Ac) 174 m²

(Ac) 174 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500

Gradient 1 : 500Smoothline Ae =

5900 mm²Smoothline Ae =

5900 mm²Acdp = 28 m²Acdp = 28 m²

174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years



15

9 6

8

4

12

Pitch 23.5°HP

HP

HP

HP

HP

HP

HP

DP - A

DP - B

DP - C

DP - D

DP - E

DP - F

DP - G

24 m²24 m²

24 m²24 m²

24 m²24 m²

24 m²24 m²

28 m²28 m²

25 m²25 m²

25 m²25 m²

1.65 / 4 = 0.4 L / s1.65 / 4 = 0.4 L / sAve flow per metre

of gutterAve flow per metre

of gutter

Length of gutter (G) = 4 m


44



28 m²

(Ac) 174 m²

(Ac) 174 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500



5900 mm²Acdp = 28 m²Acdp = 28 m²

174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years



hf

hf

10 mm min

hf

30 mm min

flashing

TABLE G1MINIMUM hf VALUES

Average inflow per metre of gutter(L/s per m)Gutter slope

0.2 0.4 0.6 0.8 1.0

Level gutter 18 20 22 23 25

Sloping gutter 12 14 16 17 19

Minimum hf (mm)

hf = 14 mmhf = 14 mm1.65 / 4 = 0.4 L / s1.65 / 4 = 0.4 L / sAve flow per metre


of gutter





28 m²

(Ac) 174 m²

(Ac) 174 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500



5900 mm²Acdp = 28 m²Acdp = 28 m²

174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years



hf = 14 mmhf = 14 mm1.65 / 4 = 0.4 L / s1.65 / 4 = 0.4 L / sAve flow per metre


of gutter





28 m²

(Ac) 174 m²

(Ac) 174 m²

+ 6 x 4 = 24

+ 6 x 4 = 24

15 x 8 = 120

15 x 8 = 120

(Ah) 144 m² (Ah) 144 m²



x 1.2 (F)

x 1.2 (F)

Gradient 1 : 500



5900 mm²Acdp = 28 m²Acdp = 28 m²

174 / 28 = 7

174 / 28 = 7



ARI = 20 years

ARI = 20 years



C O N C L U S I O NC O N C L U S I O N

many years experience in home & industrial building markets

huge range of products

backed by a national company

extensive industry knowledge

commitment to customer service

Smoothline offers unique features & benefits

many years experience in home & industrial building markets

huge range of products

backed by a national company

extensive industry knowledge

commitment to customer service

Smoothline offers unique features & benefits

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S T A N D A R D S S T A N D A R D S AS/NZS 3500.3.2:1998 National plumbing and drainage Part 3.2:...

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