How do the Garamantes develop with a prominent Carthage

[Deleted member 114175]

Let's go with a standard Hannibal wins over Rome scenario and assume a relatively indirect Carthaginian empire of tributary state/influenced states with Carthage having hegemony in trade but not being as intensive an empire as the Romans. How does Carthage interact with the Berber states over time? How does the Garamantes kingdom of extensively irrigated settlements in the Sahara desert develop, with several centuries to go until their OTL collapse in 500 AD?

Garamantes - Wikipedia

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[Revachah]

They relied on relatively shallow “fossil water”, it was inevitable without massive enslaved populations building and maintaining water systems that they would fail as a civilization.

Looking further south amongst the Serer we have examples of agroforestry centered systems that addressed fertility and water scarcity issues.

creating a more water resilient food system that brought about perennial food systems and thus a labor reduced food economy could reduce the strain on intensive slave labor.

Even creating a food bias against barley their main staple and prestige crop in favor of perennial food sources and dairy would seem advantageous.