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This study was made to look into the small rainfall as a factor of drought in Okinawa. Emphasis was put on finding statistically when and how severely the small rainfall has been received so far in Okinawa with respect to the length of dry period. Data for this study were available from the official file of rainfall records for Naha, Okinawa, prepared by the Ryukyu Meteorological Agency. 2. The results are as follows : (1) Water shortage in Okinawa is apt to occur often in summer and autumn due to unevenly distributed rainfall with time, although the number of rainy days is not remarkably small in the seasons. (2) The frequency of dry weather continuing for about a week is also large in summer and autumn, particularly at the beginning of July, right after theBaiurainy season. The frequency, however, becomes less in August and September, in which typhoons often come close to Okinawa. This means that water shotage in Okinawa that often begins in early July is usually interrupted by the active typhoon season. (3) The frequency of small rainfall for relatively long period of time covering 30 to 90 consecutive days is largest in the October to November period. A secondly large frequency appears in July. These facts indicate that the drought of relatively long period of time occurs often in Okinawa in summer through autumn, unless typhoons come close to Okinawa. (4) The frequency of small rainfall for relatively long period of time is small in February and March, showing that drought is less expected in these months than in any other months. (5) Relations among non-exceedance probability rainfall, return period, and the duration of dry weather in Okinawa have been obtained numerically and graphically for periods ranging from 30 to 90 days.", "subitem_description_type": "Other"}, {"subitem_description": "\u7d00\u8981\u8ad6\u6587", "subitem_description_type": "Other"}]}, "item_1617186643794": {"attribute_name": "Publisher", "attribute_value_mlt": [{"subitem_1522300295150": "ja", "subitem_1522300316516": "\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8"}]}, "item_1617186702042": {"attribute_name": "Language", "attribute_value_mlt": [{"subitem_1551255818386": "jpn"}]}, "item_1617186783814": {"attribute_name": "Identifier", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/20.500.12000/4527"}]}, "item_1617186920753": {"attribute_name": "Source Identifier", "attribute_value_mlt": [{"subitem_1522646500366": "ISSN", "subitem_1522646572813": "0370-4246"}, {"subitem_1522646500366": "NCID", "subitem_1522646572813": "AN00250548"}]}, "item_1617186941041": {"attribute_name": "Source Title", "attribute_value_mlt": [{"subitem_1522650068558": "ja", "subitem_1522650091861": "\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8\u5b66\u8853\u5831\u544a"}, {"subitem_1522650068558": "en", "subitem_1522650091861": "The Science Bulletin of the Faculty of Agriculture. 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