A disdrometer is an acoustic rain gauge that uses a hydrophone to record the acoustic signature of each drop of rain that strikes a given surface during a storm.  The hydrophone may be placed beneath a flat surface, which then becomes the resonance field, or within a body of water.  By measuring the acoustic signature of rain as it falls within a fixed field it is possible to determine the size and velocity each drop that falls and, through mathematical extrapolation, the total volume of rain.

This edition of Special Collections celebrates the recent wet weather with a sound collage created from recordings made on January 21 and 22, 2017 with a homemade disdrometer measuring the acoustic disruptions of raindrops on a sheet of plate glass and within a large bucket of water.

It is up to the listener to determine the volume of rainfall.