Aside from our lust garden boxes and rinsing off pollen from our cars the storms in mid-October added roughly 50,000 acre-feet to lakes Travis and Buchanan, pushing the lakes’ combined storage to more than 700,000 acre-feet for the first time since August 2011. 2011 was the driest year ever for Texas, with an average of only 14.8 inches of rain. The only comparable drought occurred during the 1950s, but no single year during that drought was as dry as 2011. It rained really hard here in Austin, but we can’t capture or store that water. We have no way to stop it from flowing downstream.
The weekend storms are a good illustration of why the lower Colorado River basin needs not just rain, but rain in the right spot, to significantly increase the region’s water supply.
Parts of Austin were hit with as much as 12 inches of rain over the Oct. 12 weekend, turning Barton Creek into a raging river and flooding areas of South Austin. The heaviest rain fell in Austin near Barton Creek, which empties into Lady Bird Lake downstream of Lake Travis. That water cannot be captured downstream of Mansfield Dam in the Highland Lakes reservoirs and is flowing down the Colorado River toward Matagorda Bay, this influx of fresh water will help the health of Matagorda Bay.
It’s critical for rain to fall upstream of Austin in the lakes’ watershed. This is an 11,700 square-mile area upstream of Austin and stretching to the north and west out past Fredericksburg, Junction, Brady and San Saba. Lakes upstream of Austin, Lake Travis and Lake Buchanan, only gained about 20,000 acre-feet of water from the storm, most of that was in to Lake Travis. The measurement there was acre-feet, by definition one acre-foot is 43,560 U.S. survey cubic feet. To us that’s less than 2 percent of the water needed to refill the lakes. But the lakes’ combined storage is 35 percent of capacity, still there is no end to the drought in sight.
LCRA’s idea is to build a reservoir in Wharton County near the Gulf Coast with the intention to take advantage of rain events like these in the future, so that the flows that enter the Colorado River downstream of Lake Travis can be held for later use. The new reservoir is expected to be complete by 2017.
Nobody is singing rain rain go away come back another day. We have all experienced the drought as it’s has helped drain reservoirs , fuel wildfires, ruin crops and put a real strain on the state’s electric grid.
In February 2013, the state climatologist told the Texas Legislature that high temperatures related to climate change have exacerbated the drought. He said that the state temperature has increased by an average of about 2 degrees Fahrenheit since the 1970s.
This U.S. Drought Monitor map is released each week.
Meanwhile, I’m going to learn a step or two from the indigenous as they managed to make it through the sizzling summers without our technology, but as always we’ll take any and all rain.