Jakarta, hitclubapk3 Indonesia
—
Associate Expert Researcher at the Geological Disaster Research Center of the National Research and Innovation Agency (BRIN) Dwi Sarah revealed the problem of land subsidence or
land subsidence
just one of many causal factors
floods in the Bandung area
.
This was conveyed in response to West Java Governor Dedi Mulyadi mentioning land subsidence which is a problem causing flooding in Bandung.He even stated that the surface of Bandung was already under the sea.
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”
Land subsidence
“only one of the causal factors, the cause of flooding is multi-factorial (topography, drainage system, changes in land use, high rainfall, land subsidence, etc.),” said Sarah to
hitclubapk3Indonesia.com
, Friday (12/12).
According to Sarah, Dedi’s statement was probably misspoken.He himself appreciated the Governor of West Java who was aware of land subsidence.
Sarah explained that the Bandung basin was once a large ancient lake.Therefore, the subsoil is mostly lake deposits and floodplain deposits.
[Gambas:hitclubapk3 Video]
“Lake sediments are mostly composed of fine grain sediments (clay and silt), very low permeability, meaning water is difficult to seep in,” he explained.
“Previously there were lots of swamps/spots where water was retained, now the land is being converted into residential areas, and so on,” he added.
Sarah said land subsidence made flooding worse.Spatially uneven land subsidence can form depressions or bowls on the surface, making it difficult for water to flow.
It is also said that uneven subsidence can cause differences in segments and can also cause damage to drainage routes.
When compared with areas where land subsidence is often highlighted, such as on the north coast, Sarah assesses that the level of land subsidence in Bandung is just as high.
He gave the example of one area in the North Pantura, namely Semarang.Semarang has a range of land subsidence varying between 1-160 millimeters per year, while Bandung is in the range of 1-200 millimeters per year.
Areas like Semarang look worse because they are located on the coast, directly affected by tidal floods and rising sea levels.
“The lower the land level, the easier it is for sea water to enter land. Apart from interaction with sea water, the Pantura area is also vulnerable to flooding due to high rainfall, double trouble,” he said.
(lom/chri)
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