I spent the first month working with the documentation and field notes from the ECOMMERCE project — specifically the records on the Roman aqueduct at Segovia and the pre-Columbian canal system at Chan Chan. The material is dense, but the structure of the reports makes it possible to follow the reasoning behind each design choice.

What stood out most was the detailed analysis of the stone channel gradients. The team measured the slope at twelve points along the surviving sections, then compared them with the theoretical optimal flow calculated using the Manning equation. The results show that the original builders maintained a remarkably consistent incline of 0.3% to 0.5% over several kilometres, which matches the range that minimises sediment deposition without causing excessive erosion.

The section on wooden sluice gates was equally revealing. The report includes a reconstruction of the gate mechanism used at the main distribution point in the Moche valley. The drawings and the hydraulic calculations indicate that the gate could regulate flow within a margin of ±5 litres per minute, which is impressive for a system built without metal components. The use of local hardwood and fibre seals is documented with photographs and wood species identification.

After a month of reading and cross-referencing, I can say that the material is reliable and the conclusions are well supported. The next step is to visit the sites and verify the measurements in person. I expect the fieldwork will confirm what the documents already suggest: that these ancient engineers understood fluid dynamics at a practical level that we are only now beginning to appreciate.