By Ralph Vartabedian • Aug 29 2017
The San Jacinto River Authority, which manages water supplies, knew that Harvey was probably headed its way. But a spokeswoman, Rhonda Trow, said the authority chose not to release water from Lake Conroe in advance because the amount it held wouldn’t have made a difference and could have caused flooding even before the storm hit.
But by Monday, the authority had no choice but to open the flood gates to send 79,141 cubic feet of water to flooded Houston every second.
The situation was similar on two dams on the Buffalo Bayou controlled by the Army Corps of Engineers up river from the Houston Ship Channel.
The long-term risks facing Houston are growing, owing to warming water temperatures in the Gulf of Mexico, which will fuel more powerful hurricanes by increasing the moisture they carry.
Harvey caused a surge in the Gulf of Mexico that raised its level by as much as 15 feet along the Texas coast, Bea estimated. That meant that for some period of time, rivers were not flowing normally, leaving inland areas less than 15 feet above sea level with little drainage.
In Katrina, the level of the gulf surged by 28 feet, the largest ever recorded along the Gulf Coast, sending water pouring over levees and canal walls. But far less rain fell in that storm than in Harvey.
Beyond the climate change, Houston faces other growing risks for flooding.
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