International Journal on Advanced Science, Engineering and Information Technology, Vol. 8 (2018) No. 6, DOI:10.18517/ijaseit.8.6.5825

Investigation of Pangkalan Floods: Possible reasons and future directions

Revalin Herdianto, Bambang Istijono, Elvi Roza Syofyan, Dalrino Dalrino


Two flood events in Pangkalan, Lima Puluh Kota Regency, triggered some questions whether or not the dam downstream the catchment is solely responsible. To understand the flood, three contributing factors were discussed, and relevant data were analysed. Flood inundation model, land use changes, and rainfall data were analysed and discussed. Flood inundation were estimated using Digital Elevation Models (DEM) of 30 m. Land use changes from year 1994 were analysed using Landsat and EVI (Enhanced Vegetation Index). Rainfall data were collected from ground Station from year 1980. Analysis showed that dam spillway at an elevation of 80 m is unlikely the main reason, since maximum flood elevation occurred at 92 m. Rather, the flood was likely induced by a constriction in the river at midstream catchment. Furthermore, land conversion from forest to palm plantation and gambir was thought to increase runoff and also responsible to the floods. Yet, this manuscript needs to be followed by a model with reliable data.


flood; inundation; EVI; Landsat; land use.

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