text: social and economic disorganization that may take place. There is a pressing need to assemble and publish as much information as possible on the damage that has occurred in past disasters. It might be met by the co-ordination and extension 8 of damage surveys which have already been undertaken in a number of developed and developing countries. Of particular interest in this connexion are the questionnaires on disaster damage forming part of the Anti-disaster Planning Programme of the State Government of Tamil Nadu, India - see Annex IV. Clearly, UNDRO could play a key role in the stimulation and co-ordination of such work among disaster-prone developing countries. 4.3 Elements at risk Information on elements at risk, such as population, property, public utilities, industry, infrastructure, etc.., is normally taken into account as standard planning and engineering practice, even when disaster prevention and mitigation are not specifically taken into account. The inclu- sion of a disaster prevention and mitigation perspective in land-use planning and in other areas of physical planning requires a somewhat different classification and definition of the elements at risk. The work involved in this reclassification would be fully justified by the resulting im- provement in the efficiency of planning procedures. 9 V. METEOROLOGICAL AND HYDROLOGICAL PHENOMENA NaturaI disasters of atmospheric origin are closely associated with hydrological features. The violent winds and prolonged and heavy rainfall of a tropical cyclone may cause a disaster on their own account, but other factors also come into existence: excessive rainfall may lead to river flooding and landslides, whilst strong winds may be the primary but not the sole cause of storm surge. It is worth noting that the greatest losses in human lives are caused by river floods and storm surges. 5.1 Tropical cyclones 
analysis: The text discusses the importance of gathering information on damage caused by natural disasters, and the need for coordination and extension of damage surveys. It also touches on the need for reclassification of elements at risk in land-use planning to incorporate a disaster prevention and mitigation perspective. The text does not specifically focus on economic development, agriculture, industry, transport, international trade, health, education, employment, culture, or science and technology. However, it does mention natural disasters, which are related to humanitarian aid and relief.