A simple water level metering system made of a ruler on a stick or plank that is lowered into the water.

---

Size: 4000px × 2667px
Photo credit: © Ingemar Magnusson / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: changeability, comparison, concr, concrete, conservation, control, creek, environment, environmental, experiment, fluctuation, flux, industrial, industry, interval, lake, level, measure, measurement, metering, nature, number, outdoor, plank, point, river, ruler, sea, stream, surface, survey, system, tide, variability, variation, wall, water