If you go down deep enough the earth temperature is stable at 12 C. But I’m pretty sure that’s like thousands of feet down. Geothermal rigs drill 500+ meters (1600 feet) down. Having a hard time finding a source on the stable earth temp though.
I mentioned 6 feet because it’s well below the frost line where I am, but I guess in that part of Iran they probably don’t have to worry about that.
Mostly I was just wondering if you had found something on how deep those waterways were actually built.
‘Appeal to Authority’, you can probably trust a scientific consensus about a subject in which they are all experts, but you probably shouldn’t trust an individual expert on a topic for which they are not recognized as an expert.
That in itself is the ad hominem fallacy: you need to judge the claim based on its merits, not the merits of the person making the claim.
For example when David Suzuki talks about climate change and people say “well he’s just a biologist, he’s not qualified!” That may be true but it doesn’t invalidate his statements.
Most of the online guides I’ve found are written under the assumption that you’re already a master at the hobby
I’ve had exactly the opposite experience lol. Most of the stuff out there is dreadfully basic, and if you want detail like scientific comparisons of the strength-weight ratios of different infill patterns, good fuckin luck. Some chum on YouTube will have some half baked experiments and that’s as good as it gets.