CONTENTS

中　　文

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PREFACE

Due to rapid economic growth in recent Years, the demands of water for agricu IturaI and industrial uses, as well as Public water supplies In Taiwan, have drastically increased each year. To utilize water resources and meet the requirements of social and economic development, the Uater Resources PlanninO Commission has followed the idea of the " Comprehensive Development Programs in Taiwan", then divided the entire Taiwan area into North Central South and East water resources regions. Each reoion is considered as an integral unit to obtain reasonable distribution of water resources through effective Planning and employment.

Hydroloflical data are the basic requirement for water resources management and development. For Years, hYdrometric stations on the river basins in Taiwan have been organized to form the Taiwan HydrometeoroloflicaI Network by the Commission. Through the Network, the standardization of observation methods.and record1n9 systems has gradually unified. The water data storage and retrieval system was established to Provide more information for the Public by the Commission.

The very first volume of "Hydrological Year Book of Taiwan, Republic of Chinas 1970" covering the data collected from the establishment of each station up to 1970, was Published in 1972. Since then, the Year Book has been published annually. Compilations of these Publications have been improved gradually.

The rainfall of Taiwan was abundant In 1990. The average annual rainfall was 3/14A mm, which was 25% more than the Lonelier (19A9-1990) average annual rainfall of 2,515 mm.

But after November, the scarcity of rainfall caused drought in next spring. The total stream runoff was 86.9 billion cubic meters, which was 30% more than the long-term (1949-1990) average annual streamflow of 66.8 billion cubic meters. There were five typhoons influenced Taiwan area, and same damages were reported.

This volume of Year Book of 1990 is now completed and will be distributed to various governmental and private agencies. Suggestions for improving the Year Book are welcome and appreciated.

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Director General

October, 1990