“Subsurface water” means ground water and water in the vadose zone that may become ground water or surface water in the reasonably foreseeable future or that vegetation may use.
Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations
Water that flows over or is stored on the ground surface. (GEMI, 2012) .
Source: Identifying and assessing water sources: Guidance document for the onshore oil and gas industry, International Petroleum Industry Environmental Conservation Association (IPIECA), 2014. Global Standards