I am always amazed that the politicians from 75 years ago in Oklahoma had some foresight. They built a lot of lakes for drinking water. Oklahoma City metro area is under water rationing, but not from lack of water, but the processing and pumping ability. OKC provides water to dozens of other smaller cities as well as the residents of the city itself.
Right after WW2 the city got busy building several lakes, and the city owns the property where future lake will be. Developers want to build on that area, but the city blocks it, and it will be a lake when the real need comes along.
All the lakes are fed by rain water. A few inches of rain over the state flows into the rivers, and the lakes fill up. With several inches of rain the lakes become flood control lakes, and they do a great job. The city has plans to build more water treatment plants and pumping facilities.
The newest lake is just a few miles from my house. Built in 1984 it is right along I-35 and Rt-66.
https://edmondok.com/338/Arcadia-Lake