Table 1 | Design Rainfall Intensities
(mm/h)
Average Recurrence: Once in 20 Years
(Minimum for eaves gutters).
ACT
Canberra
137
NSW
Albury
135
Armidale
154
Batemans Bay
211
Bathurst
143
Bowral
170
Broken Hill
130
Casino
198
Coffs Harbour
232
Cooma
129
Coonabarabran
178
Cowra
144
Dorrigo
214
Dubbo
159
Forbes
151
Glen Innes
159
Gosford
189
Goulburn
145
Inverell
179
Kempseyw
220
Kiama
224
Kiandra
143
Lismore
219
Lithgow
141
Maitland
169
Merimbula
207
Mittagong
172
Mullumbimby
250
Murwillumbah
244
Muswellbrook
141
Newcastle
181
Nowra
219
Orange
152
Penrith
166
Port Macquarie
223
Robertson
228
Singleton
148
Sydney
214
Taree
190
Tweed Heads
245
Wollongong
233
Wyong
186
TAS
Bridgewater
101
Burnie
118
Deloraine
108
Dover
97
Flinders Island
128
Hobart
99
Kingston
98
Launceston
101
Mt Wellington
122
New Norfolk
100
Queenstown
118
Scottsdale
119
Sorell
101
St Helens
131
St Marys
205
SA
Adelaide
123
Arkaroola
134
Ceduna
125
Mt Barker
120
Mt Gambier
108
Murray Bridge
117
Nurioopta
111
Port Augusta
124
Port Pirie
125
Yorketown
118
NT
Alice Springs
139
Darwin
285
Katherine
230
VIC
Bacchus Marsh
126
Ballarat
127
Benalla
133
Geelong
118
Hamilton
120
Healsville
129
Horsham
120
Korumburra
116
Lakes Entrance
124
Melbourne
127
Mildura
125
Morewell
129
Orbost
130
Stawell
127
Wonthaggi
114
QLD
Biloela
220
Brisbane
251
Bundaberg
241
Cairns
282
Cape York
301
Charleville
170
Charters Towers
218
Cloncurry
172
Emerald
220
Goondiwindi
182
Gympie
228
Hughenden
199
Innisfall
254
Kingaroy
208
Longreach
189
Mackay
273
Mareeba
219
Mt Isa
169
Mt Morgan
225
Noosa
253
Proserpine
272
Rockhampton
248
Roma
192
Southport
246
Toowoomba
189
Townsville
260
Warwick
178
Weipa
293
WA
Abydos
199
Albany
142
Broome
252
Bunbury
148
Carnarvon
142
Collie
145
Dampler
231
Derby
254
Geraldton
132
Halls Creek
181
Hammersley
180
Hillside
192
Kalgoorlie
116
Katanning
125
Kununurra
256
Marble Bar
205
Meekatharra
111
Mundaring
139
Newman
143
Perth
146
Port Headland
233
Roy Hill
160
Tom Price
164
Wittenoom
182
Note:
•
Data obtained from the Standards Australia
Installation code for metal roofing and wall
cladding SAA HB39-1997.
•
Data for other locations may be obtained
from Australian Rainfall and Runoff (1987)
published by the Institution of Engineers,
Australia or may be obtained from local
drainage authorities. Data for any locality
in Australia is available (to a resolution of
1/40th of a degree of latitude or longitude)
from the Bureau of Meteorology.
•
Data shown for large cities are the maxima
within the greater city areas. Data for
specific locations within these areas
may be obtained by reference to the
above publication or from the Bureau of
Meteorology.
•
More stringent requirements should
be considered for buildings where
the avoidance of gutter overflow is of
paramount importance.
•
All gutters and outlets, particularly box
gutters served by internal sumps, need to
be regularly inspected and maintained to
avoid blockages.
