understanding the numbers - flow and volumes

Educational Resources
10cm x 10cm x 10cm = 1litre
1m x 1m x 1m = 1m3 = 1kl     
10m x 10m x 10m = 1,000m3 = 1000kl = 1ML (million litres)
100m x 100m x 100m = 1,000,000m3 = 1000ML = 1GL

Worked Example using Malabar Outfall 2017 Data ​​

References 
National Outfall Database:
​https://www.outfalls.info/detail/locations/13

BOM 
http://media.bom.gov.au/social/blog/39/when-dam-size-matters/

Melbourne Water
​https://www.melbournewater.com.au/community-and-education/about-our-water/water-storage-reservoirs/Thomson