WorldWide Drilling Resource

Frequently-Used Geological Terms Part 31 Glossary Adapted from the Dictionary of Geological Terms I - Continued Interface - The boundary of deposits separating the top of the uppermost layer of sediment and the water where sedi- mentation is occurring. Interference - 1) Masking of a desired seismic signal by others arriving at very nearly the same time. 2) Condition occurring when a water well’s area of influence comes into contact with or overlaps that of a neighboring well. 68 JUNE 2014 WorldWide Drilling Resource ® New Product from Flomatic Corporation Adapted from a Flomatic Corporation Press Release Flomatic Corporation introduced a new model 80DICL-VFD, special patent- pending submersible pump check valve for use with variable frequency drive (VFD) control submersible pumps. Standard check valves will chatter and be noisy when a VFD goes to low flow, causing pre- mature wear and eventual fai lure. The unique valves are designed to minimize flow loss- es and hydraul ic shocks in the pump- ing system. It fea- tures a standard epoxy coating (NSF- approved powder) ductile iron body i n c o r p o r a t i n g North American Specialty Products’ patented groove lock type pipe connec- tions called Certa-Lok ® to support deep- set pumps. An exclusive stainless steel guided poppet system ensures the valve auto- matically adjusts noiselessly from high to very low flow rates. The radiuses of the valve seat allow a self-cleaning one-point swiping action by the radius-edged cus- tom molded rubber seal disc. All internal parts are made from corrosion-resistant materials and have a high strength, durable design. Interfinger - To merge through a series of interlocking or overlapping wedge- shaped layers. Intergranular - Located or occurring between granules or grains. Intermediate - 1) A subdivision of a widely-used system for classifying ig- neous rocks on the basis of their silica content. 2) Igneous rocks generally hav- ing a silica content of 54-65%. Intermittent Stream - 1) A stream only flowing at certain times of the year, as when it receives water from springs or from a surface source. 2) A stream that does not flow continuously, as when water losses from evaporation or seep- age exceed the available streamflow. Intermontane - Lying between moun- tains. More terms next month!