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Plot: Is the Cambridge growth phenomenon about to be derailed by a shortage of water? This documentary shows how, as part of a hugely successful public health initiative, the watercourse known as Hobson’s Conduit has for 250 years diverted a natural spring to provide Cambridge with its main source of drinking water. However, demand is now causing springs to dry up, precious chalk streams to disappear, and the iconic River Cam to be badly degraded