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III. METHODOLOGY
3.1 Study Area
The study area is situated in Palu catchment, Central Sulawesi Province. Geographically, it is located between 0
o
52’50” to 1
o
35’12” S and 119’45’24” to 120’10’50” E.
Palu River is the main river that crosses the Palu City and ended in Palu Bay, study site is show in Figure 3.1. Palu catchment has unique topographic
condition; where in the west and east sides are the mountainous area, while the north side is hilly and some parts in the southern side is coverage of National
Reserve of Lore Lindu.
Figure 3.1 Palu Catchment; located in Central Sulawesi.
3.1.1 Topography Condition
Palu catchment has unique of topographic characteristic. The elevation of Palu River Catchment is varying from 0 to 2500 meters above sea level. On the
eastern and western side of Palu River Catchment are hilly areas. As well as the upstream area of Palu River is a mountainous region that is located in Lore Lindu
National Park.
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Figure 3.2 Digital Elevation Model of Palu Catchment Area Sources: SRTM
3.1.2 Climate Condition
Rain falls throughout the year, the heaviest period occurrs from April to July and October to December. The spatial variation of rainfall amount in the area
indicated a decreasing trend from north to south part of the catchment area, where the north side is urban with high population and south part is mountain with high
vegetation. The averages rainfall on the study area is varying depend on the location with range from 1,000 mmyear – 3,500 mmyear; generally the rainfall
becomes heavier on the southern part of the catchment. According to Palu-Poso Watershed Management Agency BPDAS Palu-Poso, generally February is the
driest month while May and November are the wettest months during wet season. Temperatures vary only a few degrees over the course of the year.
Daytime temperatures in lowland areas of the catchment area range from 26° C – 32° C. Highland areas are significantly decreased, as air temperature drops about
6° C with every 1,000 m rise in altitude.
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