Mostly Situ Housing Surrounded By Dr. Eng. Imam Ahmad Sadisun

Learning from Situ Gintung. So Dr. Eng. Imam Ahmad Sadisun, M.T. entitled the article published in People’s Daily Thoughts (30/3). Deeper, a member of the Scientific Group of Applied Geology Faculty of Earth Science and Technology (FITB) Institut Teknologi Bandung (ITB) that also expressed its analysis of Situ Gintung told reporters “PR”.

According to him, the cause of the breakdown of the massive dam in Cirendeu village, District Ciputat, Tangerang City, Banten, which claimed more than a hundred victims, referring to negligence. The broad outline, Situ Gintung disaster happened because of inconsistencies on the regulation of land use planning and territory as well as weak monitoring.

Imam then explained the three causes of levee built situ Dutch East Indies in 1933. First, the natural factors. Change of seasons that do not correspond to natural cycles until the uncertainty of rainfall, took part in situ or damage to the levee.

“Rainfall 160 mm / day was already above average. It could be the design of the dam is already predicted to accommodate rainfall above average. But now, catchment water volume is limited because of the deposition or sedimentation. As a result, overtopping (pelimpasan water through the top of the embankment) more easily, “said the lecturer FITB-ITB.

Imam analyze the causes, namely, the inconsistency of the rules of space and territory through function over land that is not suitable. In a documentary about the 51 reservoirs and ponds in West Java, most of it has been surrounded by densely populated area, not least in Situ Gintung.

“No wonder that when the dam burst, the water instantly swept the houses of citizens. It should be 100 meters from the foot of the embankment there should be no building, even around the body of the dam was not to be. The dams are embankment, not the native land, and are not designed to withstand building , “he said.

People who consciously inhabit the restricted area before, is like installing a time bomb. Nahasnya, early warning and monitoring system as a security alarm embankment was also found in Situ Gintung, could even be in situ mostly in West Java.

Talking about monitoring, it means stepping on the last factor, namely the stability of the embankment. Situ Gintung volume of two million cubic meters of that category there is great, untouched by standard monitoring system, even a visual monitoring. “From the information, no one dared to mention, for example, inclinometer, which is a tool to determine the areas prone to landslides and piezometers for detecting the flow of water through the pore pressure. It was a standard device that is crucial to install, let alone land around the embankment switching function,” he said ,

Imam also questioned drained or drainage system functions and spillway flooding (spill way) that prevent the rapid draw-down (decrease the water quickly so far embankment body and enhance water pressure).

As the experts who feel morally responsible in security-related dam embankment construction and monitoring, Imam provide input through an interview in his office at the Faculty of Science and Technology of Earth (FITB) ITB, Jln. Ganeca No. 10, Bandung, Thursday (2/4).

How the character and general conditions there and reservoirs in West Java?

There situ character, like Situ Gintung, which originally formed naturally, and for the needs of the community, made dike. There is also another character situ, for example dammed the embankment at its lowest point so that the accumulation of body water pressure was accommodated.

Other characteristics, namely the embankment at the bottom of a basin so outflows as average, not gather at one point only. It was relatively safe. Situ with levee built around it also. This means that if the embankment is higher than the surrounding, it should be wary of.

For there are indeed soil water levels are higher than the surrounding soil, especially residential areas, should be evaluated and convinced that the construction of the embankment is stable. In essence, the components of the embankment must be ensured to function properly. The component is simple, but its function should always be monitored.

Moreover, as I’m concerned, lakes in Jabar puddle widened due to sedimentation that could not accommodate the volume of water in accordance with the original volume. As a result, the sediment can damage the body of the dam due to high pressure.

As for reservoirs in West Java, such as Jatiluhur, Cirata, and Saguling, tanggulnya already taken into account the factors that will be found in a life span or lifetime of a construction.

In addition, standard and advanced monitoring has also been carried out, including real-time or can be read online with a particular data center systems. It has been also installed the sensor so that when there is a crack of 100 cm, the red light in the control center on.

 As anticipated Situ Gintung tragedy, with the conditions that exist there, what steps should be taken?

Promptly evaluate although it visually. I believe the levee construction experts to conduct combing walkover foot levees and dikes had to assess whether or not the embankment is stable.

If there are indications of instability as soon as possible should be given as plus additional construction reinforcement beronjong (piles of stones with woven wire) so that the water can still flow, injected with cement, to drive a nail if that dam heavyweight.

How do you assess situ monitoring or dams for this?

The government should have a clear database system. Until now I do not know exactly how many there in West Java. The database would be better if it could be accessed by the public online.

If they find strange symptoms, they can report it. So, do not rely on public works officer (PU, in West Java Water Resources Management Agency) to inspect. The inspection may be once a week, but a disaster can occur in an interval when no inspection. Every building, the government must have data. The problem is whether or not the data is updated, for example the number of puddle, changes its function, risk analysis is primarily concerned with changes in the function, and loss.

About changes in the function into tourism, as in Situ Gintung, actually it does not matter if only utilize natural conditions. However, if there is no development in it, this is a problem.

As the warehouse expert, what contribution to Situ Gintung ITB and operational dams or other there?

We’ve lowered geology and civil engineering students to examine. The plan, I will plunge this week. Contributions from ITB, will provide solutions requested either from PU or IAGI.

For large dams, friends ITB has been acting as a consultant, designer and researcher invited government. In the construction or there is a problem in large reservoirs, ITB experts also intervened. We involve geology, civil engineering, as well as meteorology and climatology.

While focusing into it when there are indications of a disaster. No time evaluation function revitalization of lakes in Greater Jakarta, experts from ITB also involved.

Source (http://newspaper.pikiran-rakyat.com/prprint.php?mib=beritadetail&id=67996)

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