[...]... Lifetime of the facilities should be determined by examinig the following: • Operational function of the facilities The number of years until the facilities can no longer be usable due to the occurrence of problems in terms of the function of the facilities, for example the water depth of a mooring basin becoming insufficient owing to the increase in vessel size • Economic viewpoint of the facilities The. .. year’s worth of observations, and then the lowest water level is taken as the LAT However, in the case of Japan, the chart datum level is obtained using the old method described in (1) above (approximate lowest water level) There will be no switchover to the LAT in the near future in Japan, but it is planned to meet the IHO recommendation by stating the difference between the LAT and the chart datum... but in the case of such small vessels there are large variations in the principal dimensions and so particular care should be exercised when using Table T- 2.1.2 (9) Tonnage The definitions of the various types of tonnage are as follows: (a) Gross tonnage The measurement tonnage of sealed compartments of a vessel, as stipulated in the “Law Concerning the Measurement of the Tonnage of Ships” The “gross... systematic order is the basic information necessary for carrying out appropriate evaluation of the level of soundness of the facilities in question, and executing their maintenance and repairs At the same time the maintenace data is useful when taking measures against the deterioration of the facilities as a whole and when investigating the possibility in the life cycle cost reduction of the facilities... property if the facilities are damaged • Impact on society and its economy if the facilities are damaged • Influence upon other facilities if the facilities are damaged • Replaceability of the facilities (c) Lifetime The length of lifetime should be taken into account in determining the structure and materials of the facilities and also in determining the necessity for and extent of the improvement of the. .. called for the facilities due to new port planning etc • Physical property of the facilities The number of years until it is no longer possible to maintain the strength of materials composing the structures at the specified level due to processes such as corrosion or weathering of these materials (d) Encounter probability The encounter probability is intimately linked with the lifetime length The encounter... complete construction work within the stipulated period The construction period is generally determined by things like the availability of the materials, the construction equipment, the degree of difficulty of construction, the opening date and the natural conditions (j) Construction costs etc Construction costs consist of the initial investment costs and maintenance costs All of these costs must be considered... supplement the main items The texts in large letters are the main items that describe the parts of the Notification and the basic items that must be obeyed, regarding the items related to the Notification The sections marked Commentary mainly give the background to and the basis for the Notification, etc The sections marked Technical Notes provide investigation methods and/or standards that will be of reference... heights of rocks or land marks shown on the nautical charts are the elevation above the mean sea level, which is the long-term average of the hourly sea surface height at the place in question (In the case that the observation period is short, however, corrections for seasonal fluctuations should be made when determining the mean sea level.) The difference in height between the chart datum level and the. .. design works, specific examples of structures, and other related materials (5) Design methods can be broadly classified into the methods that use the safety factors and the methods that use the indices based on probability theory, according to the way of judging the safety of structures A safety factor is not an index that represents the degree of safety quantitatively Rather, it is determined through . alt="" The Overseas Coastal Area Development Institute of Japan 3-2-4 Kasumigaseki, Chiyoda-ku, Tokyo, 100-0013, Japan Copyright © 2002 by The Overseas Coastal Area Development Institute of Japan Printed. construction in the field. Its English version was published by the Overseas Coastal Area Development Institute in 1980, but it introduced only the skeleton of the Japanese version without giving the details. The. portion of the Technical Standards and Commentaries of Port and Harbour Facilities in Japan (1999 edition) published by the Japan Port and Harbour Association, stipulated by the Ordinance of the