Where did all the water that caused the Mystic River flooding come from?

Trump turned on the spigot in California and it just now made its way to Texas. So, Trump did it.

The Soros Aquifor

large amount of water converging to one river in a short amount of time. i.e. Flash Flood.

A rain event brought about by the remnants of a tropical system. The area was in a drought. The topography is hilly. All of the water from rain events funnels into the Guadalupe. One inch of rain drops over 27,000 gallons on one acre. Now think about 11 inches over thousands of acres, all funneling into one water body.

Not sure which flood you're talking about, but one in central Texas was from the Guadalupe River and affected the Mystic Camp for girls.

It’s “hill country.”

The rain water is channeled to low lying areas (rivers).

LOTS (near historic levels) of rain in a short period of time, in this type of topography, means Flash Floods.

The remnants of Tropical Barry moved slowly moved over the area. It became stationary and dropped over 20 inches of rain. That’s equivalent to 4-5 inches per hour. To make matters worst that area has deep valleys so all the rain funneled to that area.

Clouds.

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That's a normal occurrence?

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according to wikipedia: "Tropical Storm Barry's remnant mid-level circulation became embedded within a broader mid-level trough containing tropical east Pacific remnant moisture. Thunderstorms and heavy rains from this system caused deadly flooding in Central Texas on July 4–5, 2025"

The thing just sat on top of the area dumping water over a long period of time...the area is very hilly so lots of square footage of land was funneling water down to the river...

So those river valleys are normally shallow small rivers that cut shallow channels. Essentially it is a stream on limestone rocks in a flood plain. On either side are limestone bluffs or high ground which will never flood. When it rains torrentially the only thing that will fill up is that shallow, limited river valley. So whereas the Brazos River near Houston and upstream will just fill the entrenched deeper river and perhaps flood overbook to an extent, when the valleys in the Hill Country flood that little lazy stream deepens to twenty feet across the "shallow" river valley bounded by the high ground.

There have been significant floods of the various rivers out there in my lifetime. And there has been loss of life most every time. People love to camp alongside those rivers.