[BTinSF]

In the US, where artificial canals and waterways have been created in new developments there's a strong tendency for them to turn into open sewers or stagnant algal swamps because of bad flushing action or inadequate movement of water through them to remove contaminants that are thrown in or washed in as runoff or whatever. Looking at these artificial islands and their surrounding waterways, especially given the apparent high density of the development lining the islands, what is being done to prevent the sort of nastiness I see here??