Inter-linkage Case Study of Basin in

Kazuo Oki (The University of Tokyo) Background Keyword＜Food production＞ Food demand will increase by increment of population.

World Population Population in South-East Asia （2010-2050） （2010-2050） 90.0 79.5 80.0 1.4 times 70.0 9.0 1.3times 56.7 60.0 8.0 7.7 50.0 20102010年 7.0

(100 million) 40.0 2050年 5.9 30.0 2050 6.0 20.0 12.4 12.8 5.0 1.2times 10.0 4.0 0.0 ） （ 100,million 2.9 3.0 2.3 developed先進国 developing途上国 countries countries 2.0 ・ 1.0 World’s population in 2050 will become 9.1 0.0 年 年 年 年 billion, mainly due to increase in developing 2010 2050 20102010 2050 2050 2010 2050 countries South East Indonesia ・70% increment of agricultural production is Asia needed to meet future food demand.

Increment of food production may give negative impacts to environment. Background Keyword＜Water・Food・Environment＞ Prediction of Global Warming Impact in Southeast Asia（IPCC）

Global Warming leads significant decrease of crop production, water in the downstream, inequality of water utilization, and increase of our health crisis.

How peoples adapt to these problems Big social problems!!

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Ｗe will need to propose the new river basin model in Asia (Indonesia ) that takes into consideration the balance of water, food and health in response to climate change.

Objectives

To discuss the new inter-linkage of Citarum river basin in Indonesia with various fields players.

Field site :

Citarum River Basin Indonesia

Landuse

Classify (%) Paddy 35 Plantation 25

Forest 23 Urban, bilt-up 12 Water 5

The Citarum River is the largest river in West . It is 350 km long and has a catchment area of 6000 km2 . 4

Objectives

Let’s discuss together !!

Speakers

(1)Dr.Koki Homma (Kyoto Univ.): Crop Ｓcience (2)Dr.Keigo Noda (UTokyo): Agricultural Hydorology (3)Dr.M. Syahril Badri K (ITB): Water Ｍanagement (4)Dr.Chiho Watanabe(UTokyo): Ｈｕｍａｎ Ｅｃｏｌｏｇｙ

Key Words in Citarum river basin

Agriculture-Remote sensing –Water

Land use, Urbanization, Sediments, Nutrients

Floods, Drought, Water allocation, Lack of data, Education, Community, Climate Change, Eco Village,

Health, Impact of Changing lifestyle, Chemicals, Stress, Participation

Summary

Ｗe will need to propose the new river basin model in Asia (Indonesia ) that takes into consideration the balance of water, food and health with various field players.

Characteristics of Citarum river basin: The Citarum River is the largest river in . It is 350 km long and has a catchment area of 6000 km2 . The annual mean precipitation varies from 1800 to 2800 mm/year. In this basin, 70％ of the annual precipitation falls in the rainy season, from November to March. city is located on the upper part of the river, and there are three large on the river (Saguling upstream, in the middle of the river and downstream). The Citarum River is the most important river in West Java, supplying water for Bandung and . Approximately 80% of the domestic water in Jakarta is withdrawn from the Citarum River downstream of Jatiluhur dam .

In the future, climate change may have an undesirable impact on water availability in this basin.

Therefore, evaluation of available water resources is quite necessary to manage water resources effectively.