Honestly the water mapping theory is the one that actually makes sense to me, way more than "alien landing strips" which is what everyone defaults to because its more dramatic. The lines do seem to correlate with underground aquifer locations and when you factor in that the Nazca people were dealing with a seriously arid environment, drawing massive diagrams to track where water flows underground isn't mad at all, its actually pretty logical.
Curious whether anyone has looked at this alongside the geoglyph shapes themselves, like do the animal figures point toward water sources or is that a stretch. I've been down a rabbit hole on this for about three weeks now and I keep finding bits that support it then bits that completely contradict it, would love to know what evidence you stumbled across specifically.