When they dig the trenches or canals, they leave the silt on the parapets. When it rains, most of it gets washed back into the water ways. My guess is, there is no budget to haul away the garbage.
I understand that they are filling up trenches and canals to create housing areas.
I heard of brain drain in Guyana, but I never realized the extent of it. These people are beyond stupid. They just don't care about the environment they live in. They are demented. Probably brought on by greed.