Your plan/analysis assumes about an order of magnitude more comprehension of the water cycles than actually exists. But already the Law of Unintended Consequences is biting hard everywhere that interference with natural hydrological systems has been attempted. The current attempt to back down from and reverse the “drain the swamps” mentality is just one example. There are many more.
As for “nature’s inability to adapt”, that’s a serious misconception. Nature, by necessity, adapts to and absorbs every event and influence. But you may not like how it does so. That’s the crux. Unless you understand its “priorities and procedures”, you will ‘misunderestimate’ the adaptive process every time.
Engineers are seriously underqualified to design and project the effects of such projects. And the greater their capacity to create change, the more dangerous that becomes. The Corps of Engineers has a lot to answer for.