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I I I I * , I I I I I' I I I I I I I I UKAt" I U DOOK VI - eStimatiOn OT Large (0 txtreme t"lOOOS Preface to ARR98 The 1987 edftion of Australian Rainfall and Runoff (ARRa7) was the culmination of millions of dollars of professional inputs and represents what was then the state-of-the-art of engineering practices in flood estimation in Australia_ -, Since 1987 there have been continuing developments of improved procedures fDr flood estimation which should be incorporated into Australian Rainfall and Runoff (ARR)_ At the present time these developments dD not justify a complete revision of the full document The National Committee on Water Engineering of the InstHution of Engineers, Australia views ARR as a 'living' document which needs tD be regularly updated, with some chapters possibly undergoing extensive revision in the future to reflect current best practices_ It is envisaged that the future revisions of ARR will be carried out progressively on an industry needs basis and subject to the availability of new procedures which improve current practices in flood estimation_ To facUitate this progressive revision Df ARR, the NCWE decided that the 1998 edition of Australian Rainfall Runoff (ARR98) should be published in a different format to that of ARR87_ The 14 chapters of ARR87 have been regrouped into eight separate bDOks on individual aspects of rainfall, runoff and flood estimation_ The 14 chapters in ARR87 have been regrouped as follows: Book I Introduction - incorporating chapter 1 of ARR87 Book II Design Rainfall CDnsiderations - incorporating chapters 2, 3 & 6 of ARR87 Book III ChDice of Flood Estimation Methods and Design Standards - incorporating chapters 11 & 12 of ARR87 Book IV Estimation of Design Peak Discharges - incorporating chapters 5 & 1 0 of ARR87 Book V Estimation of Design Flood Hydrographs - incorporating chapters 7, 8 & 9 of ARR87 Book VI Estimation of Large to Extreme Fioods - incorporating the revised chapter 13 of ARR87 Book VII Aspects of Hydraulics Calculations - incorpDrating chapter 4 of ARRa7 Book VIII Urban Stormwater Management - incorporating chapter 14 of ARR87 The publication of ARR98 in this format will, in the future, allow individual bODks to be reviewed, revised and updated progressively as required_ You will find the content in this edition of ARR is the same as that in ARR87_ The revision prDcess has already commenced, and Book VI on the Estimation of Large to Extreme FloDds has now been revised. Chapter 10 of ARR87 (Book IV) on Flood Frequency Analysis is currently being reviewed for possible revision. A revision team from the University of Melbourne, Newcastle University and MDnash University is undertaking this project. It is expected that Book IV Section 1 will be updated following the completion of the revision to Book IV Section 2, thus bringing Book IV up to current best practice_ In all cases the revision process is undertaken in two general stages_ The first is a review of the current document to examine its adequacies and to identify the scope of any future revision_ The scope of the revision is then sent to reviewers acting on behalf of the NCWE for comments and ultimately for modifications leading to the finalisation of the scope of the revision for the particular book_ The revision is then undertaken in accordance with the scope of the revision by a revision team. On completion of the revision, the revised document is submitted for general review by the NCWE or reviewers acting on its behalf. Their comments are incorporated into the final document before it is published_ Throughout the revision process, wide consultations is to be carried out by the revision teams to involve practitioners and other stakeholders, and to inform them of the nature of propDsed revision and seeking their input The NCWE is committed to ensuring that ARR continues to represent best engineering and hydrological practices, and tD provide state-of-the-art guidance for the estimation of floods in Australia_ The NCWE is confident that you will find ARR continues to be useful and relevant to your practice as it has been in the past, but with the added flexibility of a regular updating of ARR to reflect new ideas and technology to the industry in a timely manneL Ross Knee -Chairman ARR Advisory Panel Dr Tony H.F, Wong Chairman National Committee on Water Engineering