FE Meme
Ocean Floors Flatter Than Earth: No Water Curvature?
#296: Ocean floors are even flatter than land, surveyors never measure curvature on water, and canals or locks are engineered on level water, so Earth cannot be a globe.
The Meme
Long text block over diagram of land, islands, and ocean surface claiming no curvature has ever been measured on any body of water.
Why It Spreads
The essay format stacks civil-engineering examples viewers trust, from canals to locks, then jumps to "no curvature recorded on water." Each local project looks perfectly flat, so the conclusion feels like practical wisdom from builders rather than a scale error about what "level" means on a large mass.
What It Gets Wrong
Engineers level structures perpendicular to local gravity on a geoid, not along an infinite Euclidean plane. At metre scale on R ≈ 6371 km, h ≈ d²/(2R) is microscopic in a lock or canal, while kilometre baselines reveal metres of bulge and ships hide hull-first over open water. Claiming surveyors never deal with curvature swaps short-baseline leveling for a planetary-radius test the meme never runs. TestTheGlobe's Water Finds Level Means Flat and TestTheGlobe's Curvature Calculator walk through the observations and predictions this image skips.
The Debunk
Local level water in canals and locks is compatible with a spheroid where h ≈ d²/(2R) predicts only microscopic drop at metre scale but metres of bulge over 10 km. A text essay that never logs distance or eye height is inconsistent with shoreline hiding and laser surveys. Use TestTheGlobe's Curvature Calculator to compare the meme's claim with a measurable prediction.
- TestTheGlobe's Water Finds Level Means Flat: "level" means perpendicular to gravity toward Earth's center, which is consistent with a large-radius sphere, not a planar ocean forever.
- TestTheGlobe's Curvature Calculator: at pool scale h ≈ d²/(2R) is invisible, while a 10 km open-water baseline reveals on the order of 8 m of midpoint drop on R ≈ 6371 km.
- TestTheGlobe's Rainy Lake Curvature: long-baseline field checks log hidden height over water, the measurement type the meme claims never happens.
- The diagram never cites a surveyed distance, instrument height, or drop value, so listing canals and locks cannot falsify either model.