Take the bus (Route 5 or 85) from Placa Imperial. The bus stop at Placa Imperial is located at Av. Marques de Montoliu. You can pay driver when you board and let the driver know you want to stop at Pont del Diable. The stop is on the highway, but near the park entrance. To return to Tarragona, simply go back to bus stop, pay driver for another ticket, and continue on Route 5 or 85.
The ability of engineers to calculate the slope for many kilometers and the ability of builders to accurately perform it. This is the art of leading water (from Latin: aqua — water and ducere-lead).
Roman engineers could determine the slope with an accuracy of 0.1 degrees — that is, 1 m of slope per 1 km of aqueduct. It is not easy to implement this in practice, so to avoid changing the angle of inclination, special reservoirs were created that accumulate and equalize water. The water trough is preserved in the aqueduct here. You can see it if you climb to the top.
In fact, it was not necessary to build an aqueduct of this size. It would be possible to lay siphon pipes to the bottom of the gorge, following its profile and then lift it up to a height just below the original level. This is called a hydraulic gradient. Why did the Romans prefer to build giant aqueducts? The size is disorienting. We think if bigger and more massive means more expensive. However, pipes (lead pipes) have cost the Romans more expensive than bridges. Masonry was cheap, due to the cheapness of stone, brick, and mortar. Only if the depth of the gorges was great, the Romans stretched pipes to the bottom,and then up. In our case, the aqueduct is 27 meters high. The water was taken from the Rourell area, 92 metres above sea level, and carried more than ten kilometres