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1. The ponds are not for Wastewater treatment
2. The ponds are actually rainwater catchments, all villages have several of them, and they are used both for water drinking purposes and for agriculture during the dry season.
3. Actually both, bodies and seawater. However the most significant problem is salinity as the cyclone brought a tidal way that flooded thousands of drinking water ponds.
4. I can't say exactly the right quantity, but the average pond size is: 33m x 33m x 2.5 m and 66m x 66m x 2.5 m Then the pond is totally dewatered and lime is spread forming a thin layer.

Regards, Jeff