Theory 48/Springs/Ratio lens
Temperature Is Path Depth
The claim
Spring temperature is set by the ratio of deep to shallow flow path, so a spring fed mostly by deep circulation is warmer in winter and cooler in summer.
01Mechanism
Deep water equilibrates with rock temperature while shallow water tracks surface conditions; the mix sets the outflow temperature.
02Prediction
Temperature should track the flow ratio.
03Refutation
Temperature tracking air temperature would remove path depth.