If you live or work in the Hawkesbury-Nepean Valley you are at risk of flood

Site A has a:

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.

Site B has a:

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.

Site C has a:

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.

Site D has a:

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.

Site E has a:

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).