of flooding in an 80-year lifetime OR a 20% chance each year.
This is also called a 1 in 5 chance per year flood.
This flood is similar in size to the February 2020 flood.
of flooding in an 80-year lifetime OR a 5% chance each year.
This is also called a 1 in 20 chance per year flood.
This flood is similar in size to the 1990 flood.
of flooding in an 80-year lifetime OR a 1% chance each year.
This is also called a 1 in 100 chance per year flood.
of flooding in an 80-year lifetime OR a 0.2% chance each year.
This is also called a 1 in 500 chance per year flood.
This flood is similar in size to the 1867 record flood.
of flooding in an 80-year lifetime.
This is the largest possible flood in the Hawkesbury-Nepean Valley. It is based on computer modelling by flood experts and is extremely unlikely to happen. It is also known as the probable maximum flood (PMF).