Engineering Marvels of the Indus Valley
How a 5000-year-old civilization built standardized bricks, grid cities, and the world's first urban drainage system.
Standardized Everything
The Indus Valley Civilization (3300-1300 BCE) used bricks with a consistent 4:2:1 ratio across hundreds of kilometers. No central authority we know of yet perfect standardization.
Urban Planning
Mohenjo-daro and Harappa had:
- Grid layout streets at right angles, main roads 10m wide
- Covered drainage every house connected to a central system
- Public baths the Great Bath of Mohenjo-daro, waterproofed with bitumen
- Granaries centralized food storage with ventilation
The Drainage System
Every house had a bathroom. Wastewater flowed through covered channels to main drains. Inspection holes at regular intervals for maintenance. This level of sanitation wasn’t matched in Europe until the 19th century.
What We Can Learn
- Standards enable scale (even without a known written specification)
- Infrastructure investment pays dividends for centuries
- Sanitation is civilization’s foundation, not its luxury