City aims to build 5m biopores this year

Triwik Kurniasari ,  THE JAKARTA POST ,  JAKARTA   |  Wed, 04/01/2009 11:37 AM  |  City

The city administration has set a target of creating 5 million biopores this year in five municipalities across the city in an effort to improve water retention and therefore ease the ongoing water crisis.

The City Environmental Board (BPLHD) said that the city only had 335,590 biopores, far below the recommended 76 million.

BPLHD head Peni Susanti said that the board would require developers to build the biopores in a bid to meet the target.

“The bylaw rules that every building, including malls and hotels, must have absorption wells or biopores,” Peni said, referring to the 2005 bylaw on groundwater.

She said her office was cooperating with the City Building Supervision Agency (P2B) to ensure that developers applying for building permits abide by the regulations.

“We also encourage Jakarta residents to make biopores at their homes,” Peni said.

She said that the biopores could help retain rainwater longer in the soil and therefore maintain the equilibrium of the groundwater table.

The biopore technology was introduced by a lecturer at the Bogor Agriculture Institute (IPB), Kamir Raziudin Brata, in 1976. Biopores are made with a T-shaped iron bore to create a 1-meter-deep hole in the ground with a diameter of between 10 and 30 centimeters. The hole, also containing organic waste, absorbs more rainwater and therefore allows insects and worms to live. Firdaus Ali, an environmental expert at the University of Indonesia, said biopores were not the only way to solve the city’s problem.

“Jakarta is experiencing a serious water crisis due to the massive exploitation of groundwater. Therefore, I fully support the administration’s plan to raise the ground water tax,” Firdaus said. Earlier in March, the administration announced that it would draft a bylaw to increase ground water tax in a bid to prevent exploitation and land subsidence.

The BPLHD reported that groundwater exploitation had caused land to sink about 1.2 meters. The construction of high-rise buildings also speeds up land subsidence.

The tax in wealthy residential areas will increase from Rp 525 per cubic meter to Rp 3,300, and
from Rp 8,800 to Rp 23,000 in industrial areas.

“The administration can use the money to develop more sophisticated technology for water absorption... It should also impose stricter sanctions on violators,” Firdaus said.

Besides biopores, the administration has been working with the IPB in developing bio-retention technology.  This method uses the chemical, biological and physical properties of plants, microbes and soils, to slow rainwater runoff and retain water.

In addition, the BPLHD reported that as of December 2008, the administration had built more
than 83,000 absorption wells capable of retaining 1,154,000 cubic meters of water.

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