Deep tunnel and reservoir project best way to reduce flooding, body says
The Jakarta Post, Jakarta

The city’s water regulatory body has recommended the construction of an underground reservoir to alleviate both flooding and pollution in the capital.

It proposes building a 17-kilometer-long tunnel one hundred meters below the ground with a catchment area of 30 million cubic square meters. It would be integrated with the East and West flood canals, as well as Cengkareng Drain.

The body’s head, Achmad Lanti, said Thursday the concept had five benefits: controlling floodwater, creating new clean water resources by recycling wastewater and rainwater at once, preventing land subsidence and sea water intrusion, improving the quality of groundwater and surface water and overcoming the city’s liquid waste problems.

“The five-in-one concept is an environmentally friendly system since we can decrease the volume of liquid waste by processing it into clean water,” he said.

The body had discussed the project with the city administration long before the devastating floods in the city last month. However, it was forced to submit its proposal to the administration ahead of time as part of its flood response.

The construction of the tunnel will be divided into three stages. Initially it will link Bukit Duri, Kampung Melayu, Manggarai, Karet sluice gate, Grogol dam, Muara Angke and the West Flood Canal.

In the second stage, the tunnel will extend to Buaran through Pulo Gadung, Cakung and Cilincing, linking up with the East Flood Canal.

In the third stage, the tunnel will reach Cengkareng Drain in West Jakarta.

Lanti said the project would be completed within two years at an estimated cost of Rp 4 trillion.

“We plan to conduct feasibility studies and finalize the engineering design by the end of the year,” he said.

Deputy Governor Fauzi Bowo said the administration had approved the proposal but had yet to decide when the project would begin.

“We expect the central government to support the project in terms of both approval and funding.”

He said another advantage of building an underground structure was that it was unnecessary to acquire land.

“Hopefully it won’t take as long as the East Flood Canal project, which was delayed due to complications in the land acquisition process.” (04)