sewage - n. waste material (such as human urine and feces) that is carried away from homes and other buildings in a system of pipe

miraculous - adj. very wonderful or amazing like a miracle

optimism - n. a feeling or belief that good things will happen in the future : a feeling or belief that what you hope for will happen

plank - n. a long, thick board that is used especially in building something

sanitation - n. the process of keeping places free from dirt, infection, disease, etc., by removing waste, trash and garbage, by cleaning streets, etc.

hose - n. a long, usually rubber tube that liquids or gases can flow through

manhole - n. a covered hole in a street that a person can go down into to do work under the street
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