All lands on the earth are part of river basins or watersheds, not least in the area of West Java Province, which is divided into 40 river basins, and one of which is Citarum River Basin covering a total area of 13,000 km2.
The main Citarum River Basin has an area of approximately 6.600 km2, with a length of the river about 250 km, but it has been joined by many small watersheds connected through East Tarum Canal, with an area of 4.400 km2, consisting of many rivers such as Ciherang, Cilamaya, Ciasem, Cipunegara and Cipancuh, and also joined by another small watersheds through West Tarum Canal, with an area of 2.000 km2 consisting of Cikarang River and Bekasi River.
Citarum is a very strategic river basin, with a population of approximately 30 million. There are three large man-made dam, namely Saguling, Cirata and Jatiluhur, which produce 1.400 megawatts of electricity. Area of agricultural land irrigated by Citarum reached about 240.000 ha in the lowlands, and 150.000 ha in the uplands. In addition to meet the water need of urban, rural, industries, and agricultures in West Java, Citarum River also supplies 80% of raw water needed by Jakarta, the capital Indonesia.
Citarum River is originated from many small tributaries that flow from many mountains and volcanoes with elevation of more than +2.000 m above sea level, that lined surround Bandung Basin, among others Malabar, Wayang, Windu, Kamojang, Darajat, Manglayang, Palasari, Tangkubanparahu, Burangrang. The tributaries come from many springs in the mountains and volcanoes, and the most distant is from springs in Wayang Mountain, so it is often mentioned that Citarum River spring is from Wayang Mountain.
In the uplands, the tributaries flow in 7 sub-watersheds, namely: Cihaur, Cikapundung, Citarik, Cirasea, Cisangkuy, Ciwidey, and Ciminyak, then all converge into one stream in the main river, Citarum River.
Aerial photo of the Citarum Jatiluhur area (2011)
Citarum River is not just the water that flows from the mountains and volcanoes to the downstream. The presence of ground water beneath the surface, the riverbed and riverbank erosion, dissolved natural minerals, fishes , water animals and plants, as well as other particles, both the living and the dead, all are parts that can not be separated from Citarum River. Even bushes, riverside forests, puddles in the flood plain, and all the life on the river bank should be seen as an integral part of Citarum River.
Once Citarum River leaves the mountains and volcanoes slopes, then it flows on the plain in Bandung Basin, the flow becomes slow, meandering, looking for an easily eroded riverbank, and the river valley becomes wider, which is filled by alluvial soil deposited since thousand years ago due to flooding.
Finally, Citarum River flows downstream through the three man-made reservoirs, namely Saguling, Cirata and Jatiluhur, continues to its mouth at Ujung Karawang in the northern coast of West Java.
The content of muds, which are carried by the river flow then settle in estuary, and formed a delta. Citarum Estuary is interface between fresh water and salt water, it is one of the most biologically productive zone. Many species of fishes live and become one entity and breed in the delta habitat which is rich in nutrients.
Citarum diversity is not only influenced by the area through which the river flows, but also by the changing seasons, as well as by the difference in wet and dry years. Seasonal and annual variations in the amount of water flowing in the river, sediments and nutrients which are transported by the river can be very striking, and forming special characteristics of Citarum River.
Almost all of the milestones of human life culture history develop in the riverbank, as water resources are easily available. Lots findings relics that prove this hypothesis, as examples are ancestral human fossils that can still be found along Awash River in Ethiopia, then first civilization appeared in the third millennium BC, along the Euphrates, Tigris, Nile and Indus, and then followed along the Yellow River. Much later important development in human history occurred along the river, as the next example is along a river in northern England in the early days of industrial factories.
Similarly, in the Citarum River, once believed to be the largest international port in West Java, when the kingdom of Tarumanagara came to power in 4-8 AD century. Citarum Estuary port is where the traders from many nations transit, trade, and build a civilization. Citarum River had also played an important role in the development of economic activities from coastal to inland areas. Artifacts and ancient Chinese ceramics are found along the river. Some came from Thailand, Vietnam, India, and even from Europe. The existence of temple Batu Jaya was allegedly built by the activities which was driven by international trade and development Tarumanagara Kingdom at that time.
However, since the first time human began to live on the riverbank, since that time also the river began to be exploited. The river water was taken, the fishes were also taken, it also served as transportation infrastructure, but the most severe human made modifications to the river, and conquered it. Even human "abusing" the river as a place to dispose of their household garbage and industrial waste.
The construction of river shortcuts, weirs, dams and reservoirs in the world, has brought great changes and drastic to the rivers, watersheds and river basins. Of all the modification to the rivers by human, the construction of dams and reservoirs are the most impact in changing the nature of the river, in total. The reservoir is the opposite of the river, the essence of the river is water which is dynamic and flowing freely, while the essence of the reservoir is water which is static as it does not flow.
A natural wild river is a river that flows naturally, ever-changing, erode the riverbed, settle the mud, look for the new channel, breaking down the riverbank, and may also be a little flow in the dry season. While the man-made dam is monumental, making the river to be forced to be controlled, forced to set the pattern of wet and drought seasons, may trap sediments and nutrients, and affect temperature as well as chemical processes. The most miserable thing is human and wild life have to move to nowhere because their homes will be sunk.
Geological history shows that nature is always seeking balance, the rain from the sky since millions