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There are dams. Many, many dams! Rivers in Texas generally flow from the northwest to the southeast, into the Gulf of Mexico. The Guadalupe river flows southeast into Canyon Lake and beyond. Flooding happens regularly on this river on either side of the dam.Unbelievable how the flooding could have been this bad in this day in age. Usually they build dams and have other safety precautions to make sure catostraphic flooding like this never occurs. The pictures they are showing look like the area was struck by a tornado or hurricane.
The only way to have ample drinking water and some sort of flood control in the Texas Hill Country is by using dams to collect floodwaters. The key thing to understand is that there is so much water that, even dammed, the rivers still flashflood. It's unavoidable given the terrain, lack of top soil, and source of water from the Gulf of Mexico. The flooding, however terrible, is a blessing for the supply of drinking water.
Another thing I think might be getting missed here is the widespread area of flooding that happened over the weekend. From the Guadalupe River near Kerrville to the Llano River 60 miles or so north, from Mason to the west 100+ miles or so to east of Georgetown and Austin. Many, many creeks and rivers flooded over a huge area. We're hearing about the Guadalupe because of so many deaths there, but it was bad everywhere.