Title AS/NZS 3500.5:2000 National Plumbing and Drainage - Domestic installations Licensee Licensed to LUU MINH LUAN on 26 Feb 2002 Conditions of use This is a licensed electronic copy of a document where copyright is owned or managed by Standards Australia International Your licence is a single user licence and the document may not be stored, transferred or otherwise distributed on a network You may also make one paper copy of this document if required Web Check-up National plumbing and drainage Part 5: Domestic installations Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 ISBN 7337 3530 AS/NZS 3500.5:2000 Australian/New Zealand StandardTM National plumbing and drainage Part 5: Domestic installations Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited National plumbing and drainage Part 5: Domestic installations AS/NZS 3500.5:2000 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee WS-014, National Plumbing and Drainage Code It was approved on behalf of the Council of Standards Australia on 28 July 2000 and on behalf of the Council of Standards New Zealand on 21 November 2000 It was published on 15 December 2000 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The following interests are represented on Committee WS-014: AUSTAP Association of Hydraulic Services Consultants Australia AusPoly Australian Association of Certification Bodies Australian Building Codes Board Australian Gas Association Australian Industry Group Brisbane Water Department of Communication and Information, Local Government and Planning (Qld) Department of Infrastructure, Energy and Resources (Tasmania) Department of Land and Water Conservation (N.S.W.) Department of Lands, Panning and the Environment (N.T.) Department of Urban Services (A.C.T.) Electricity Supply Association of Australia Gas Appliance Manufacturers Association of Australia Housing Industry Association Institute of Plumbing Australia Master Builders Australia Master Plumbers Australia Master Plumbers, Gasfitters and Drainlayers New Zealand National Association Sanitary Plumbing and Drainage Contractors (Australia) New Zealand Manufacturers Federation Plumbing Industry Commission (Victoria) South Australian Health Commission Sydney Water Corporation Water Corporation Western Australia Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems To maintain their currency, all Standards are periodically reviewed, and new editions are published Between editions, amendments may be issued Standards may also be withdrawn It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Australia web site at www.standards.com.au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue Alternatively, both organizations publish an annual printed Catalogue with full details of all current Standards For more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options For information about these services, users should contact their respective national Standards organization We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities Please address your comments to the Chief Executive of either Standards Australia International or Standards New Zealand at the address shown on the back cover This Standard was issued in draft form for comment as DR 97126 AS/NZS 3500.5:2000 Australian/New Zealand Standard™ Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited National plumbing and drainage Part 5: Domestic installations First published as AS/NZS 3500.5:2000 COPYRIGHT © Standards Australia/Standards New Zealand All rights are reserved No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020 ISBN 7337 3530 AS/NZS 3500.5:2000 PREFACE This Standard was prepared by the Joint Standards Australia Standards New Zealand Committee WS/14, National Plumbing and Drainage, to provide a suitable Standard for domestic-type plumbing and drainage The objective of this Standard is to describe in a simplified way the installation requirements for hot and cold water services, sanitary plumbing and drainage and stormwater drainage Alternative systems are not included in this document and reference should be made to the relevant Parts of AS/NZS 3500 The Standard incorporates extracts from the National Plumbing and Drainage Standards to suit domestic plumbing installation Readers of this Standard are advised that some network utility operators may have additional or varied requirements to those described herein Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Section of this Standard is a Building Code of Australia primary referenced Section by way of BCA Amendment to be published by January 2001 Statements expressed in mandatory terms in notes to tables and figures are deemed to be requirements of this Standard Other notes are informative only Support and contribution is acknowledged from Master Plumbers Australia, Exhibition Street, Melbourne AS/NZS 3500.5:2000 CONTENTS Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Page SECTION SCOPE AND GENERAL SECTION WATER SUPPLY 15 SECTION HOT WATER SUPPLY 55 SECTION SANITARY PLUMBING AND DRAINAGE 107 SECTION STORMWATER DRAINAGE 199 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 NOTES AS/NZS 3500.5:2000 SECTION SCOPE AND GENERAL Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Page 1.1 SCOPE 1.2 REFERENCED DOCUMENTS 1.3 DEFINITIONS 12 1.4 APPLICATION 12 1.5 TERMITE MANAGEMENT 13 Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 NOTES 277 AS/NZS 3500.5:2000 STEP Determine allowable maximum catchment per downpipe To determine the allowable maximum catchment per downpipe for the selected eaves gutter go to Figure 5.2 (see Figure 5.30 below) Using the slope of the gutter and the Rainfall Intensity for Bathurst, start at point ‘X’ (7300 mm 2) and follow the arrowheads via 145 mm/hr to catchment per downpipe Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The allowable maximum catchment per downpipe is 53 m2 FIGURE 5.30 APPLICATION OF FIGURE 5.2 — REQUIRED SIZE OF EAVE GUTTERS COPYRIGHT AS/NZS 3500.5:2000 278 STEP Determine minimum number of downpipes To calculate the minimum number of downpipes, divide the roof catchment areas by the allowable maximum catchment per downpipe from Figure 5.2, then round up to a whole numbers of downpipes: Minimum number of downpipes = = Roof catchment area Allowable maximum catchment per DP 175 m 53 m = 3.3 Round up to a whole number of downpipes, therefore: Number of downpipes required = NOTE: For practical reasons the number of downpipes may need to be more than the minimum or a greater effective cross-sectional area selected at STEP Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited STEP Determine average catchment area per downpipe To calculate the average catchment per downpipe, divide the roof catchment area by the number of downpipes: Average catchment per downpipe = Roof catchment area Number of downpipes 175 m = = 43.75 m Average catchment per downpipe = 43.75 m COPYRIGHT 279 AS/NZS 3500.5:2000 STEP Divide the roof into approximately equal catchment areas and locate downpipe positions Divide the roof catchment area into catchments (see Figure 5.31) and nominate the high points between downpipes Check that the actual catchment areas are less than or equal to the allowable maximum catchment per downpipe NOTE: There are many possibilities for downpipe positions Valley gutters discharging to graded eaves gutters should be at high positions to allow stormwater to drain away from internal angles Where possible, select downpipe positions close to main stormwater drains Downpipe positions may be affected by minimum clearances to other devices The allowable catchment from Figure 5.2 should never be exceeded Water collected by the valley gutter will flow in both directions upon entering the eaves gutter at the high point It is difficult to determine how much flows in each direction; however, this needs to be considered when checking catchment areas against the allowable maximum The sub-catchment areas may not add exactly to the total catchment due to rounding off during calculations Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited All catchments are less than the allowable of 53 m from Figure 5.2 DIMENSIONS IN METRES FIGURE 5.31 DWELLING PLAN WITH DOWNPIPE POSITIONS COPYRIGHT AS/NZS 3500.5:2000 280 STEP Select an overflow measure if required It is assumed for this example that an overflow measure is required Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The overflow measure selected for this project is Example 1, from Figure 5.3 bead 20 mm below the top of the fascia board at the high point of the gutter (see Figure 5.32) DIMENSIONS IN MILLMETRES FIGURE 5.32 (EXAMPLE 1, FIGURE 5.3) STEP 10 Apply dimensions to figure The dimensions have been applied to Figure 5.33 DIMENSIONS IN METRES FIGURE 5.33 APPLICATION OF DIMENSIONS TO FIGURE COPYRIGHT 281 AS/NZS 3500.5:2000 5C2 EAVES GUTTERS — DESIGN EXERCISE 5C2.1 Problem On the following pages information for a project exercise is provided to allow the reader to practise designing eaves gutter systems (see Figure 5.34) A solution follows in Paragraph 5C2.2 EAVES GUTTER AND DOWNPIPE PROJECT Lismore NSW Dwelling Project name: Designer Lismore NSW Locality Rainfall Intensity 20 year ARI Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Roof catchment area Selected eaves gutter and slope Concealed eaves gutter 9600 mm 2, 1:500 fall Downpipe size Rectangular downpipes Allowable maximum catchment per downpipe Number of downpipes Actual maximum catchment per downpipe Downpipe and gutter high point (HP) positions on plan Selected overflow measure from Figure 5.3 Overflow measure COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 282 NOTE: See Paragraph 5C2.2 for a solution DIMENSIONS IN METRES FIGURE 5.34 DESIGN EXERCISE FOR EAVES GUTTERS COPYRIGHT 283 AS/NZS 3500.5:2000 5C2.2 Solution to design exercise for eaves gutters Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited EAVES GUTTER AND DOWNPIPE PROJECT Project name: Lismore NSW Dwelling Designer Solutions Locality Lismore NSW Rainfall Intensity 20 year ARI 220mm/hr Roof catchment area 1.18 × 134=158 m Selected eaves gutter and slope Concealed eaves gutter 9600 mm 2, 1:500 fall Downpipe size 100×75mm Allowable maximum catchment per downpipe 48.5 m Number of downpipes Actual maximum catchment per downpipe 43.7 m Downpipe and gutter high point (HP) positions on plan See Figure 5.35 Selected overflow measure from Figure 5.3 See below Example from Figure 5.3 Overflow measure COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 284 * The water collected by the valley gutters will flow in both directions from the highpoint If 90% of the water from the valley gutters flowed to the top right downpipe, the allowable maximum area of 48.5 m would be reached DIMENSIONS IN METRES UNLESS OTHERWISE NOTED FIGURE 5.35 SOLUTION TO DESIGN EXERCISE FOR EAVES GUTTERS COPYRIGHT 285 AS/NZS 3500.5:2000 5C3 BOX GUTTER—WORKED EXAMPLE 5C3.1 Problem A m by m garage is to be added to the house in the eaves gutter worked example (see Paragraph 5C1) The solution to the eaves gutter worked example is shown in Figure 5.36 with the proposed garage added The garage roof extends under the eaves of the South side of the house and is connected to the brick wall of the house under the eaves The south wall of the garage is on the boundary line The garage has a brick parapet on all sides and the dimensions include the width of the parapets Provision has been made in the parapet design for a sloping roof of 5° sloping to the south and for a box gutter The original eaves gutter drainage system is unchanged Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited Design the garage roof drainage system DIMENSIONS IN METRES FIGURE 5.36 BOX GUTTER DESIGN EXERCISE—GARAGE COPYRIGHT AS/NZS 3500.5:2000 286 5C3.2 Solution Follow the method for design of small box gutters (see Clause 5.5.6.3) A site investigation shows that the stormwater drainage pipe on the east side of the house extends to the street Drain the garage roof with a box gutter on the inside of the south wall Place a rainhead and downpipe on the South East corner, which will connect to the east side stormwater drain The roof will therefore slope to the south wall STEP Determine the rainfall intensity (I) The min/100 year ARI rainfall intensity for Bathurst is 200 mm/hr STEP Determine the roof catchment area (A) Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The plan area of the garage roof including the parapets is m × m = 36 m (This is conservative because nothing has been deducted for the catchment shielded by the overhanging eaves.) If the slope factor F = 1.04 for the 5° sloping roof is applied, the garage roof catchment area = 36 × 1.04 = 37.4 m NOTE: It is not necessary to apply a slope factor in this case because of the shielding of the parapets Hence, this value is conservative (See AS/NZS 3500.3.2 or HB 114 for more information.) It is possible for the eaves gutter to overflow to the garage roof due to either very high intensity storm bursts (more than 20 year ARI), or due to a blockage at E In the latter case, discharge from the catchments A-B-C-D and C-D-E could overflow to the garage roof and, hence, to the box gutter Select roof cladding that is capable of withstanding such overflow discharge (consult with cladding manufacturer if necessary) It might be necessary in some cases to seal side laps in the vicinity of the zone of impact at the top end of the garage roof Catchment area parallelogram A-B-C-D = (4 × 3) × 1.22 = 14.6 m Catchment area C-D-E = × 3/2 × 1.22 = 11.0 m Total catchment area = 37.4 + 14.6 + 11.0 = 63.0 m STEP Determine the flow into the rainhead The design flow for the box gutter Q (L/s) = [A (m 2) × I (mm/hr)] / 3600 (sec) Flow into the rainhead Q = 63.0 × 200/3600 COPYRIGHT = 3.5L/s 287 AS/NZS 3500.5:2000 STEP Select the box gutter, rainhead and downpipe dimensions Go to Figure 5.5, select a flow of 4L/s For a box gutter width w bg = 200 mm, the minimum height of box gutter anywhere along its length = 120 mm Select rainhead dimensions l r = 130 mm and hr = 140 mm and a rectangular downpipe of 75 × 70 The downpipes on the eaves gutter of the main roof are larger (100 × 75), therefore select 100 × 75 downpipe to match The values of h a , lr , h r are minimum values only Alternatively; (a) if w bg =250 mm, h a = 110 mm, lr = 115 mm and h r = 140 mm; or (b) if w bg =300 mm, h a = 105 mm, lr = 110 mm and h r = 140 mm, which may be preferred because of building constraints Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited The revised roof drainage layout is shown in Figure 5.37 and the dimensions of the box gutter, rainhead and downpipe in Figure 5.38 DIMENSIONS IN METRES UNLESS SHOWN OTHERWISE FIGURE 5.37 ROOF DRAINAGE LAYOUT — GARAGE COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 288 DIMENSIONS IN MILLIMETRES FIGURE 5.38 DIMENSION OF BOX GUTTER, RAINHEAD AND DOWNPIPE COPYRIGHT 289 AS/NZS 3500.5:2000 5C4 SURFACE DRAINAGE—WORKED EXAMPLE 5C4.1 Problem A house on an urban allotment with an area not exceeding 1000 m as shown in Figure 5.39 is to be located in Australia Design the surface drainage system constructed with non-metal products 5C4.2 Solution C4.2.1 Layout The layout of the surface drainage system shown in Figure 5.39 has to comply with Clause 5.6.2.3 and have the site landscaped so that the overland flow path is directed away from the building; e.g the cross-fall of a paved path along rear of the building is to be away from the building Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited C4.2.2 Surface water drains (c) For the surface water drains — (d) the minimum size, determined from Clause 5.6.3.2, is— (i) between a downpipe outlet and a stormwater or inlet pit, DN 90; (ii) between the stormwater, pits A and B, DN 150; and (iii) between pit B (see Clause 5.6.16.2.(c)) and the street kerb, two DN 100; (e) the minimum cover, determined from Table 5.7: is— (iv) within the property— (A) other than under the driveway, 100 mm; and (B) under the paved driveway, 75 mm below the underside of the pavement; and (v) (f) outside the property under the paved footpath, 50 mm below the underside of the pavement; and the minimum gradient, determined from Table 5.8 for Australia, is DN 90, DN 100 and DN 150, 1:100 C4.2.3 Surface water pits For surface water pits— (g) the minimum internal dimensions, determined from Table 5.9, are at A and B, 450 mm × 450 mm (depth to invert of outlet less than 600 mm) (h) the minimum fall across each pit is 20 mm (see Figure 5.9(a)) COPYRIGHT Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 290 DIMENSIONS IN METRES FIGURE 5.39 STORMWATER DRAINAGE INSTALLATION PLAN COPYRIGHT National plumbing and drainage Part 5: Domestic installations Licensed to LUU MINH LUAN on 26 Feb 2002 Single user licence only Storage, distribution or use on network prohibited AS/NZS 3500.5:2000 ISBN 7337 3530 AS/NZS 3500.5:2000 Australian/New Zealand StandardTM National plumbing and drainage Part 5: Domestic installations ... Joint Standards Australia Standards New Zealand Committee WS/14, National Plumbing and Drainage, to provide a suitable Standard for domestic- type plumbing and drainage The objective of this Standard... network prohibited AS/ NZS 3500.5:2000 NOTES AS/ NZS 3500.5:2000 STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND Australian/New Zealand Standard National plumbing and drainage Part 5: Domestic installations... prohibited National plumbing and drainage Part 5: Domestic installations AS/ NZS 3500.5:2000 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee WS-014, National Plumbing