Excavations in the religious and administrative center of ancient Nippur have brought to light a 4,000-year-old Archive of Canal Engineering. The collection of cuneiform tablets includes detailed technical drawings and diagrams of hydraulic sluice-gates used to manage the floodwaters of the Euphrates. These records show that Sumerian engineers used advanced mathematical ratios to calculate water pressure and flow rates to prevent crop damage during the spring thaw.
The archive belonged to a family of hereditary canal inspectors who oversaw the maintenance of the region's irrigation infrastructure for several generations. The tablets even include 'maintenance logs' detailing the number of laborers and quantities of bitumen required to seal the stone embankments. This discovery highlights the critical role of technical bureaucracy in sustaining urban life in ancient Mesopotamia.