HILL COUNTRY FLOODING
The Texas Hill Country is famous for floods. The most common floods in Central Texas are flash floods. If you have never seen a flash flood, be grateful. Water comes rushing in and fills up low lying areas in an instant. The wall of water mows down anything in its way including cars and trucks.
But there is another common flood type in the Texas Hill Country - the sheetwater flow. It's similar to the flash flood in that it usually takes a while to build up before it starts moving. The flash flood moves rapidly. The sheetwater flow is slow and constant.
In the Seguin-New Braunfels area, the neighborhoods at Las Brisas are subject to sheet water flooding because the houses are built in the path of a natural geological flood plain that fills up in neighboring farm fields and then overflows those fields and travels through two neighborhoods on its way to the Guadalupe River.
In the early 2000's, developers and builders ignored these natural sheetwater flows and the brand new homes they built flooded multiple times. The water originated at the New Braunfels airport, some 10 miles away and collected drainage from every direction finally gathering in farm fields on Hwy 46 flooding the fields and then as the water reached its tipping point, it would start flowing towards the Plantation and the Las Brisas neighborhoods.
Developers are required to account for drainage in their subdivisions. Home builders are responsible for the drainage on their lots they build on. Most of the time, drainage is dealt with, but sometimes drainage becomes a collossal mistake. If you are in a new to newish home, something built in the last 7-8 years and you experience a flooding, the drainage around you may have changed. New commercial properties that impose huge swaths of impervious cover can alter the drainage in a localized area dramatically.