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The problem is what is the definition of a "flood plain"? FEMA's definition, which changes about every decade? 50 year? 100 year? 500 year? It's along a river with endless vertical acreage upstream. Sad situation.
Warning systems? If you've ever been in a camper or tent during a rain storm you can't hear yourself think, much less being able to hear in an RV with the AC running.
I'm a scanner nerd.
We had a deer camp in E TX and I would use the WX Warn feature always. Often my family was w/ me in a trailer and more than once It went off in the middle of the night. It was certainly loud enough to wake me w/ the A/C running.
Camp wasn't in a flood prone area, but I was worried most of falling trees and limbs. Only once did I think it was bad enough to evacuate to my truck and drive to an open area w/o trees.
Looked it up and there is a NWR(National Weather Radio) transmitter in Kerrville. I know these warnings can go largely ignored, but anyone w/ a weather radio in the area should be able to receive the transmissions.
https://www.weather.gov/nwr/sites?site=WWF90Flash flood warnings were in effect that night and early morning. As Gunny pointed out there are some flood gauges, but not sure if NWS was monitoring and reporting that data.