Uniformity Coefficient : Disaster Management. A term used in specifying sand. It is the ratio of the sieve size that will pass 60 percent of the filter sand, to the effective size. (SSWID)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}