Hydrometrical

1. a. Made by means of an hydrometer; as, hydrometric observations.
2. a. Of or pertaining to an hydrometer, or to the determination of the specific gravity of fluids.
3. a. Of or pertaining to measurement of the velocity, discharge, etc., of running water.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.