Areal Rainfall Estimation Model Parameter and Input .1 Schematic Watershed Model – Watershed Delineation
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Table 4.3 – 4.4 demonstrate the land cover changes by providing information “initial state” into a “new state” to the respective period. Mostly, the
forest cover decreased due to the new agricultural land development. During the period of 1990 to 2009, is about 250 km
2
of forest cover on Palu catchment has been converted into agricultural and other land-use type such as urban area or
settlement. Based on Table 4.3, the statistics report shows that between 1990 and
2001, about 134 km
2
of forest cover has been converted into other land use type such as agricultural land, shifting cultivation, and also use as settlement. During
this period, agricultural land has increased by 132 km
2
from previous state with only 327 km
2
in 1990 become 466 km
2
on 2001. In addition of forest cover, shrub land also decreased during this period. About 127 km
2
of shrub land has been converted into agricultural land and about 11.5 km
2
of shrub land has been converted into other land use.
Between 2001 and 2009 the statistics report shows that 250 km
2
of forest cover has been converted; 169 km
2
into agricultural land and 82 km
2
into shrub land. On the other hand, shrub land had also change. About 182 km
2
have changed into agricultural land, 3.5 km
2
into build up area, and 1.4 km
2
into water or marshy land.
Figure 4.6 Land use on the Palu catchment
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