I live near a USACOE lake. They build em BIG! Maybe that moat idea is becoming more than just a joke! Maybe the wall will be electrified with searchlights and wire supplied by clean, dependable hydroelectric power. Dont pee on Trumps wall, amigo! Ha ha ha ha!!
It's so big that my fishing buddy and I logged the driving time to each of our favorite launching spots. Then I programmed a TI Programmable Scientific Calculator (using the Solunar Tables another engineer had already recorded on a "memory Strip). Then...
On Friday, all we had to do was decide & enter into the calculator where we wanted to launch & fish -- and the calculator told us when we should set our alarm clocks -- so that we'd be launching right at First Light on Saturday morning!! '-)
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One problem with a moat is that taking water from the Rio Grande for it would, undoubtedly, cause a big "International Incident".
Besides, I don't see how a moat would help: we Texans already call the alien criminal invaders, "Wetbacks"...