| Abstrak/Abstract |
The purposes of this study are to identify the zonation of lahar-affected regions and the number of damaged houses due to lahar, as well as to make an economic valuation on settlement building damage due to lahar in Kali Putih, Magelang Regency. The study was conducted by using a survey method based on physical and administrative zonations. The former was based on overflow width of lahar in Kali Putih after the Merapi erruption in 2010, while the latter was based on subdistrict. Each of the zonation units was
sampled. The sampling was carried out on the basis of settlement building vulnerability due to lahar. The sample was represented by 59 respondents and three times of Focus Group Discussion (FGD) during the study. Results of the study show that, first, the overflow width of lahar in the location of study was 1.785 km2. The widest overflow was in Sirahan Village, i.e. 0.813 km2 or 45.532 %, and the
narrowest one was in Blongkeng Village, Ngluwar Subdistrict, i.e. 0.001 km2 or 0.057%. Second, the number of houses affected by lahar was 1,290 houses. Settlement building damage was dominantly due to collapse/washed away (814 houses), moderately damaged (200 houses), ligthly damaged (140 houses), severely damaged (71 houses), and relatively undamaged (65 houses). A settlement mostly affected by the impact of lahar was Sirahan Village, Salam Subdistrict, i.e. 860 houses. Third, the largest lost resulted from the lahar was related to permanent houses, i.e. approximately IDR104,000,000.00 because the construction cost for the permanent houses was more expensive than that for semi-permanent and non-permanent ones.
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