RE: Lasers Detect Roman Roads in Britain
March 19, 2016 at 2:01 am
(This post was last modified: March 19, 2016 at 2:03 am by vorlon13.)
I probably couldn't find it right now (think I got there by accident once or twice) but there is a map online somewhere of Iowa and by rolling around the mouse/pointer on the map, I could get accurate elevations.
This is a super handy tool also. I've noticed GPS devices, even my lamented Tom Tom, could not do elevations. The map with that information is rally slick.
As for the Romans, realize when they were laying out the aqueducts, they also knew precise elevations over miles and miles too. They accurately built their channels with a precise and consistent drop to supply water to their cities. A rarely appreciated piece of technology they used were inverted siphons to cross valleys that were too deep for their aqueducts to cross overhead. They were able to build lead pipes strong enough to withstand the pressure at the bottom of the valley. Apparently one difficulty they were unable to engineer out of there systems was the calcium carbonate (hardness) that would precipitate out of the water. In an open channel, or even a covered aqueduct by removing the stone over it, workers could get inside and descale the aqueduct. This wasn't possible with their inverted siphons. They had to use several pipes and they had to be disassembled to be cleaned out.
![[Image: 37d%20Aqueduct%20siphon.jpg]](https://images.weserv.nl/?url=aytch.mnsu.edu%2FURBS110%2FRome%2F37d%2520Aqueduct%2520siphon.jpg)
This is a super handy tool also. I've noticed GPS devices, even my lamented Tom Tom, could not do elevations. The map with that information is rally slick.
As for the Romans, realize when they were laying out the aqueducts, they also knew precise elevations over miles and miles too. They accurately built their channels with a precise and consistent drop to supply water to their cities. A rarely appreciated piece of technology they used were inverted siphons to cross valleys that were too deep for their aqueducts to cross overhead. They were able to build lead pipes strong enough to withstand the pressure at the bottom of the valley. Apparently one difficulty they were unable to engineer out of there systems was the calcium carbonate (hardness) that would precipitate out of the water. In an open channel, or even a covered aqueduct by removing the stone over it, workers could get inside and descale the aqueduct. This wasn't possible with their inverted siphons. They had to use several pipes and they had to be disassembled to be cleaned out.
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