Flooding Source

All floods are different and may occur from one or a combination of the following sources, such as

• rivers• creeks• storm tide • overland flow

Rivers: Types

Creeks:

Storm Tide: Types

Overland Flow:

Q100

likely to occur once in a lifetime of 70 years

Critical Time 1 in 100

Probability of Flooding

Major Minor Flood Management System

oThe first Brisbane dwellings were built within Redcliff in 1824

o Population of approximately 1200

o First subdivision land sale was in 1842

1870 -1880 1890 – 1910 1920 - 1930

-

o2.2 million population to double in less than 50 years

oPressure to develop on flood plains & within flood overland paths

o Block sizes will keep reducing to give a higher density city

o Increased impervious surfaces & overland flooding

oMore dwellings potentially exposed to overland flow flooding

Thank You