The introduction of specialized ring wells or Vrishakupas during the Mahajanapadas urban horizon represents a monumental milestone in municipal engineering primarily because they functioned as:

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Ring wells made of terracotta segments lined vertically represent a major breakthrough of the Second Urbanization. First appearing around the sixth-fifth century BCE, these structures allowed individual households inside congested grid towns to channel domestic dirty water and sewage straight into the subsoil, providing an efficient alternative to open street drains.

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