It was found that canal estates within estuarine floodplains can have significantly larger amounts of carbon dioxide in their endmembers. This dramatically increases CO2 emissions to the atmosphere and lowers water quality, particularly when canals had less oceanic connectivity as a result of decreased tidal flushing. The resulting paper Estuarine canal estate waters: Hotspots for CO2outgassing driven by enhanced groundwater discharge? recently published in the journal Marine Chemistry can assist councils in engineering improved waterways with improved water quality and avoid expensive remediation in the future.