| Jatikramat River Kali Djatikramat, Kali Jati Kramat | |
|---|---|
 Jatikramat River ("K. Jati Kramat"), middle right in the map of rivers and canals of Jakarta (2012) | |
 | |
| Native name | Kali Jatikramat (Sundanese) |
| Location | |
| Country | Indonesia |
| State | Jakarta |
| Physical characteristics | |
| Source | |
| • location | Bekasi,West Java |
| Mouth | Banjir Kanal Timur |
| Length | 14.5 km (9.0 mi) |
TheJatikramat River (Kali Jatikramat orKali Jati Kramat) is a river inBekasi,West Java, and theeastern part of theSpecial Capital Region of Jakarta, Indonesia.[1] The lower portions of the original river have been channelized and directed into the eastern flood canal, "Banjir Kanal Timur", which continues to flow to the Java Sea in the district of Marunda, Cilincing,North Jakarta.[2] The river regularly causes flooding in the city ofBekasi[3] and Jakarta.[4]
The Jatikramat and the other two nearby rivers, theCakung andBuaran, flow from Bekasi and interconnect until draining into the Jakarta Bay in the district of Marunda through Cakung Drain and currently through Banjir Kanal Timur. In the past, the three rivers supplied water for drinking and agriculture in the area.[5] Due to continuous erosion and accumulation of trash, the average width of the Jatikramat was reduced from 10 to only 3 meters in 1990.[6]
The river often causes flooding to the surrounding area. Research by Pieter J. Kunu and H. Lelolterry ofPattimura University, Ambon, showed that the development of the city changed 85% land of Jakarta to be waterproof, unable to absorb surface water and resulted in regular floods. One of the solutions was by constructing a flood-control canal, theBanjir Kanal Timur.[5] The flow of the Cakung, Buaran, Jati Kramat,Sunter, and Cipinang rivers was cut to drain into the canal, and thereby reducing the occurrence of flood.[5] However, one little part of the Jatikramat river is now still connected to the Buaran River at a length of almost 50 meters.[7]
The watershed of the Jatikramat in the city ofBekasi comprises the flow of the Cileungsi, Cikeas and Bekasi rivers.[3]
The Jatikramat river has a length of 14.50 kilometres (9.01 mi), with the watershed area (Indonesian:Daerah Pengaliran Sungai) of 16.50 km2.[8] The average daily rainfall is 154 mm, with the peak debit at 45 m³.[8]
The river flows in the northwest area of Java with predominantlytropical rainforest climate (designated asAf in theKöppen–Geiger climate classification).[9] The annual average temperature in the area is 28 °C. The warmest month is September, when the average temperature is around 31 °C, and the coldest is May, at 26 °C.[10] The average annual rainfall is 3674 mm. The wettest month is December, with an average of 456 mm rainfall, and the driest is September, with 87 mm rainfall.[11]
In early 2000, the flow of the Jati Kramat was straightened; the river was dredged and the banks were strengthened with concrete, to yield a width of 5 meter with the depth of more than 3 meter.[6] The normalisation in Pondok Kelapa, Duren Sawit, East Jakarta, was performed since 2015.[12] This normalisation resulted a width of around 10 meter, to control annual flooding. The project was to be completed until the river mouth at Kanal Banjir Timur (KBT).[13]
6°14′00″S106°55′00″E / 6.23333°S 106.91667°E /-6.23333; 106.91667