Which ancient civilization is renowned for its advanced urban drainage systems?

• A. Mesopotamia
• B. Mesoamerica
• C. Indus Valley
• D. Nile Valley

Answer: (C)

The key idea here is that ancient urban planning and sanitation reached an extraordinary level in the Indus Valley. In cities like Mohenjo-Daro and Harappa, streets were laid out in a grid, and houses connected directly to a network of brick-lined drains that ran beneath the streets. These drains carried wastewater away to larger sewer channels, with access points and cleanly designed slopes, showing a deliberate, city-wide system for sanitation. This combination of standardized bricks, organized layouts, and integrated waste removal is what makes their drainage systems particularly renowned and distinctive.

Other civilizations had impressive achievements as well—Mesopotamia emphasized irrigation and monumental architecture, Mesoamerica developed large urban centers, and the Nile Valley centered on flood-based agriculture and monumental projects. But the Indus Valley stands out for the sophistication and ubiquity of its urban drainage, reflecting a strong emphasis on public health and organized civic infrastructure.