The main purpose of this study is to develop a GIS-based Multi-criteria Evaluation (MCE) to determine which catchment was the most suitable for reclaimation based on catchment characteristics and the current state of associated deltal's recovery. As mentioned previously, Baby and Daisy lakes have been polluted by smelter emissions from mining activities. The initial MCE analysis consists of only four criteria layers and there were no constraint layers needed for the purpose of the study. A map showing degree of suitability of the subcatchments for future reclaimation is illustrated below (Figure 2.0). Suitability values range from 0 to 70. The most suitable area is displayed in red colour while the least suitable one is represented in light blue.There are total seven lake catchments and as it can be seen from the map, Baby C is the most suitable catchment among the other six based on the MCE results produced in the previous steps. The reason that this result turned out this way could be that based on the values of catchment characteristics and on score standardization of the seven catchment, baby C seems to have the highest overall score although some of its score components (i.e. Stream power) are not as high as those of other catchments. However, none of the score components of baby C is either 0 or the lowest (refer back to table 1). Final outcomes are based on the highest value of slope, wetness, stream power and lowest value of vegetative cover (NDVI).
Figure 2.0: Final Sub-Catchment Suitability Map for Future Treatment.