Interesting theory and I can see how you get there.
But if drainage changes were the primary cause, we would've seen drought severity increasing across the time period where straightening/etc were happening... instead the drought severity increases begin _after_ that period, better aligned with temperature changes.
Additionally, your analogy to a water leak from a tank doesn't hold, because the water recharges over time...
Further, your complaints about immigrants also doesn't make sense, as water usage has been going down (and residential utilization is quite low, altogether).
As such, my theory is that you're just a right-wing crank who wants to find a reason to deny global warming, and to hate immigrants.
But if drainage changes were the primary cause, we would've seen drought severity increasing across the time period where straightening/etc were happening... instead the drought severity increases begin _after_ that period, better aligned with temperature changes.
Additionally, your analogy to a water leak from a tank doesn't hold, because the water recharges over time...
Further, your complaints about immigrants also doesn't make sense, as water usage has been going down (and residential utilization is quite low, altogether).
As such, my theory is that you're just a right-wing crank who wants to find a reason to deny global warming, and to hate immigrants.