Storm surge flooding in Demak Regency worsens and spreads
Storm surge flooding (rob) in Demak Regency, Central Java, is widening and intensifying, threatening residents in four districts and disrupting traffic on the Pantura Semarang-Demak corridor. On Friday 22 May, traffic along the Pantura Semarang-Demak route was congested for kilometres as tidal floods submerged Sayung sub-district, with depths of 20–50 centimetres causing vehicles to stall.
The flooding has spread to four sub-districts — Sayung, Karangtengah, Wedung and Bonang — interrupting daily life and undermining livelihoods, with students wading to school and traditional markets and fish farms flooded, crippling the local economy.
“In addition to flooding main roads and settlements, the tidal flood has inundated 2,000 hectares of community fish ponds,” said Demak Regency Secretary Akhmad Sugiharto on Friday (22/5).
Authorities say pumping and river normalisation efforts have not yielded results and have, if anything, worsened the problem; the current hope is for accelerated construction of coastal sea dikes. Normalisation of the Tuntang Lama River will also be pursued as part of the strategy to mitigate rob. Because of budget constraints, the Demak government can only seek assistance and coordinate with provincial and central governments.
The flood’s transport impacts are most acute; even rural residents travelling between villages must rely on boats as village roads are submerged, and cross-district routes have been disrupted by floods that now occur with every high tide on the Pantura coast.
Road elevation projects — on village, district and national levels — have been attempted repeatedly but fail to prevent flooding during high tides, which can rise even when there is no rain. “In a month, two weeks may pass with some crossing floodwaters on the Pantura Semarang-Demak route,” said Riyanti, a Demak resident who works in Semarang.
The floods are not limited to Sayung’s national road; alternate routes are also submerged as rob has spread to a 12-kilometre radius south of Demak’s coastline. “Every day brings flooding, making crossing difficult and accelerating damage to vehicles,” he added.
Maskan, a Sayung resident, said he must raise his house up to five times a year due to floods, and the local economy is paralysed as traditional markets and fish markets flood, making it hard to earn a living. “We find it hard to shop, and traders cannot sell because markets are flooded and many goods are damaged,” he said.
On Tuesday morning (19/5), tidal flooding again affected several parts of Central Java’s Pantura, with 13 families in Dukuh Tambaksari, Bedono, Sayung, Demak living on stilts.
Structural development alone will not suffice without adaptive coastal management and spatial planning. The Sayung floods persist; while the phenomenon has existed since 1990, rapid relief would come mainly from sea dike construction. Flooding from the rising sea has affected other Central Java districts such as Pekalongan, Kendal, Semarang, Demak, Jepara and Pati, with flood heights ranging from 20 to 100 centimetres.