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Human beings find sewage, and anything to do with it, unpleasant. The hunter gatherers were continually on the move and didn’t really face the problems associated with the accumulation of human waste. With the advent of agriculture, humans started “living” in fixed locations. Accumulation of wastes became a significant limiting factor in the development of early civilisations. The early history of human civilisations is linked closely to the history of sanitation and public health.
In most early civilisations, waste, including human waste was simply thrown into the streets. As towns and cities developed, clay was periodically thrown onto the top of the waste. Over time, the level of the street was raised to such an extent in some cases that stairs had to be cut down to allow entry to the houses.