Land use planning for Manat Watershed [Philippines] using geographical information system and goal programming
1993
Singh, A.
The estimated average rate of soil loss from the Manat Watershed was 19.06 tons/ha/yr. The highest soil erosion rate of 1,140.12 tons/ha/yr and the lowest of 0.26 tons/ha/yr were estimated from open land with a slope class of greater than 40 percent and residual forest with the slope class of less than 15 percent on the watershed, respectively. Slope wise (regardless of vegetation cover), average soil erosion estimated were 8.32, 5.61, 8.16, 15.30 and 54.27 tons/ha/yr from the watershed area with the slope class of 0-8, 8-15, 15-25, 25-40 and 40 percent, respectively. Land use-wise (regardless of slope) average soil erosion were estimated at 1.85, 13.11, 179.73, 578.54, 15.48, and 88.90 tons/ha/yr from the area occupied by residual forest, brushland, falcataria plantation, open land, cultivated area, and coconut plantation, respectively. A goal programming model was formulated to optimize the allocation of watershed area to different land uses with maximum production of all demanded goods and services and satisfy the constraints of social erosion, available land for allocation and available budget. The solution of the model showed that only small amounts of the demands of energy, protein, employment, and water could be satisfied due to the limited available land to be allocated to agricultural land use. Altogether 14 different land uses were allocated by the different alternatives for goal specifications. The methodology developed by this study can be used as a basis for land-use planning for any watershed using Geographical Information System and Goal Programming
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