LANDSCAPE DESIGN FOR RIVER RESTORATION BASED ON SEDIMENT COLLECTION AND MANAGING IN CANGKARENG DRAIN, JAKARTA BARAT

FENG Zihan

(Abstract: The flooding problem is an ongoing challenge in Jakarta. The design aims to solve the damage of sediment deposition to drainage function in the river and Create an adaptable river landscape to challenge irregular changes in water levels.)

Since the start of the rainy season ten years ago, heavy rains in Jakarta have caused Many people became homeless and lost a lot of property. In recent years, 40 percent of the city to fall below sea level and the ground to keep sinking, due to geographical reasons and overexploitation of groundwater. All of these factors caused serious flooding. The design site, Cangkareng Drain, is an important link in the drainage facilities of Jakarta Barat. The surrounding area is very densely populated with residents and factories. In case of a flood, the damage will be devastating. In contrast to the government’s plan to widen the river, The design focuses on how to maintain the current channel width, using natural segregation to separate and remove sediment to achieve or exceed the carrying capacity of the widening channel plan. Firstly, I plan to divert the river into vacant land, meandering its flow path. Secondly, three sedimentation zones are set at the beginning of the designed channel. Regarding the sedimentation strategy of sediments, I did some simulation analysis. The result shows that there have some difference in flow rates on both sides of the curved channel, the clear water will be discharged from the outer channel which has faster water velocity, while the sediment will be deposited on the inner side and eventually deposited in the sediment pool. After a period of time, the sediment will be excavated on the inner side of the channel through manual intervention to reduce the problem of excessive sediment in the water.

At the same time, the design also provides much needed public space, like fitness track and a museum for the use of the surrounding residents. The peninsula on the east side is designed to be work well together with flooding, and can partially replenish the shallow groundwater pumped out by people.

It is known that the flooding issue in Jakarta has been affecting the society and environment in many ways and wouldn’t be completely solved in the near future. So I want to bring realistic and effective changes to the surroundings. And hopefully, it turns out to be sustainable.