Just a thought. Even just paving over less of them might be wise.
At the far west end of Houston along the Katy Freeway, where the concrete city gives way to bigger sky and taller grass, signs advertising new master-planned communities greet you before anything else, pointing left and right to new neighborhoods going up where prairie used to be.
While Harris County officials say the new development is not happening in the floodplain — since it is built atop mounds of fill — and will not increase flood risk downstream because of drainage requirements, such as detention ponds, the fact remains that development covers the prairie sponge with concrete.
Prairies serve as natural flood mitigation, absorbing more water than other types of land, retaining water in their natural depressions and slowing down the flow with their tall grasses.
The Houston region used to be covered in that type of vegetation, back when the state’s coastal prairie was 9 million acres of grass and wetlands. Less than 1 percent of coastal prairie remains in Texas, much of it in the Katy prairie — an area difficult to define these days since it continues to shrink, but in the 1990s was roughly bounded by the Brazos River, U.S. 290, Highway 6 and Interstate 10.
“Officials at all levels should commit to preserving the Katy Prairie as a national or state park or nature preserve,” Emmett wrote. “That single act might do more to protect our community than any other. It will not only reduce future flooding, it will send a clear signal that we have a new attitude — that we recognize the value of maximizing natural green space and we understand the importance of allowing waterways to function without interference.”
That has not happened.
In the five years since Harvey, thousands of new homes have been built on the prairie and former rice farms above the Addicks and Barker reservoirs.
The reservoirs operated as intended in Harvey, but homes upstream and downstream of Addicks flooded anyway, prompting lawsuits that still are being litigated. The flooded homes were not a surprise to those who predicted development within the reservoir and upstream of it — combined with extreme rainfall — would lead to disaster.
Today’s new development continues a trend that has been underway for decades.
Between 2010 and 2020, nearly 100,000 people moved into the Harris County portion of the Addicks Reservoir watershed — a 138-square-mile area that drains into the reservoir — increasing the population there from 295,694 to 390,402, according to the Harris County Flood Control District.
In the Katy prairie area, from 2001 to 2019, 60,404 acres changed from having no pavement to some amount of development.
You can read the rest, there are lots of pictures from Harvey and earlier times to help you visualize it all. Harris County took some small steps towards discouraging development in flood plains, but as long as the county is growing and builders are looking for new tracts of land on which to build, this is what we’re gonna get.