If you drop a tennis ball into the Thames at Chiswick, the tidal nature of the river means that it will take three years to reach the sea, spending all that time coursing up and down The Tideway with the ebb and flow.
So says the display in the London Aquarium, where we’re spending a cold and draughty Saturday afternoon amongst the sharks and rays from waters far more tropical than those of the Thames outside.
It’s an interesting thought, this minutia of estuary dynamics, but one which vexed Victorian Londoners greatly, once condemning them to repeated reacquaintance with all of the effluent discharged into the river from the city.
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roads of stone 
