http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"Water boundaries, including navigable and non-navigable water bodies, are an important aspect of surveying and are commonly encountered in the practice of surveying, especially for land surveys that involve waterfront properties, riparian rights, or other land-use issues related to water bodies. Surveyors must be familiar with the relevant laws, regulations, and guidelines related to water boundaries, including the definition of high and low water marks, tidal boundaries, and the legal status of artificial water bodies such as reservoirs and canals. They must also be familiar with the various techniques used to establish water boundaries, including topographic and hydrographic surveying, as well as the use of specialized equipment such as sonar and GPS. Water boundaries are an important component of the professional practice of surveying and a topic that is covered in professional surveying examinations"--