| dc.description.abstract | After the 2010 Merapi eruption, there are still volcanic material deposits
of around 70 m3 which have accumulated on the southern and western
slopes, which have the potential for lava floods in the following years
and cause high damage to water structures. It is known that 77 sabo
dams built in rivers at Mount Merapi were damaged and were swept
away by the lava flow (BBWS Serayu-Opak, 2011). Even though several
damaged sabodams have been rebuilt, floods that cause damage still
occur. Simultaneously with the increase in the current status of Mount
Merapi to Level III Alert and monitoring of eruption activity with the
potential for cold lava in the Bebeng river, research is needed that
identifies and evaluates the current condition of these buildings so that
appropriate maintenance decisions can be made. Field surveys and
scoring are carried out through visual observations of sabodam,
analysis of sabodam is based on the Sabodam Operation and
Maintenance Guidelines (SE Ministry of PUPR no. 3 of 2019). As the
results, there are 3 sabodams in the heavily damaged category,
including BE-D4, BE-RD1A, and BE-D10. Broken subdams in the
Bebeng River can generally be caused by 2 things, namely damage
caused by the slope of the river bed which is still high about 11% and
then there’s no structure to reduce falling material in the last sub dam
which can erode the surrounding land to to the subdam foundation and
the existence of mining activities near the building. | en_US |
