"Large Woody Debris". Large tree trunks, branches or pieces of woody plant material.

Logging While Drilling. Refers to the technology that records (logs) characteristics while drilling. This information provides the client with more accurate real-time information about the surrounding geology, leading to more informed decisions on well path trajectory and reservoir characteristics.

low water datum. (1) The geopotential elevation (geopotential difference) for each of the Great Lakes and Lake St. Clair and the corresponding sloping surfaces of the St. Marys, St. Clair, Detroit, Niagara, and St. Lawrence Rivers to which are referred the depths shown on the navigational charts and the authorized depths for navigation improvement projects. Elevations of these planes are referred to IGLD (1955) and are Lake Superior 600.0 feet, Lakes Michigan and Huron 576.8 feet, Lake St. Clair 571.7 feet, Lake Erie 568.6 feet, and Lake Ontario 242.8 feet. (2) An approximation of mean low water that has been adopted as a standard reference for a limited area and is retained for an indefinite period regardless of the fact that it may differ slightly from a better determination of mean low water from a subsequent series of observations. Used primarily for river and harbor engineering purposes. Boston low water datum is an example.

(Long Way of diamond) Distance from an outside point on a bond to a corresponding outside point on the following bond across the long distance of the diamond opening. Also the distance across all of the long openings of all the diamonds in the sheet.