Parameter Tree:
EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > LIGHT TRANSMISSION

Definition:
Measurement of the percentage of light received at a photo cell placed at fixed distances from a light source.

Reference:
Adapted from: Dictionary of Earth Science, 5th ed.. 1997. Sybil Parker, ed. in chief. McGraw-Hill.