Natural Disaster. The law governing the movement of fluids in permeable media which states that the velocity of flow is direcdy proportional to the hydraulic gradient. This is applicable only for very low Reynolds' numbers
Intergovernmental Oceanographic Commission IOC technical series 37, Tsunami Glossary (A glossary of terms and acronyms used in the tsunami literature - English), , United Nations Educational, Scientific and Cultural Organization UNESCO, Paris, France 1991. http://unesdoc.unesco.org/images/0008/000885/08853 8eb.pdf, (ND/ Tsunami Sci - Brit) {590}