One possibility for future energy production involves harvesting the warmth of Earth’s tropical oceans, using the natural heat differentials in the water to drive turbines. It would be relatively simple if you didn’t need a ludicrously large piece of pipe, 33 feet in diameter and stretching a kilometer beneath the water. To put that in context, that’s a New York subway tunnel wide and two and a half Empire State Buildings high.
Only marginally concerned with the actual utility of such a project, I recently embarked upon a quest to record and illustrate the rate of water flows. Would you like to measure the rate of a dripping faucet, but lack the sophisticated equipment required? Do not despair! Armed with a gallon jug and a stopwatch, I have prepared an easy-to-use water-flow estimation guide.