Lake Georgetown is the City's primary source of water. The chart above shows the lake level since January. The top of the chart indicates a full lake -- 791 feet above sea level. The bottom of the chart indicates the lowest level of the lake where the City's intake pipe can draw water -- 755 feet. The Brazos River Authority pumps water into Lake Georgetown from the much-larger Lake Stillhouse Hollow near Belton. (Stillhouse Hollow has 227,771 acre feet of capacity; Lake Georgetown has 36,823.)
Total water use
This chart shows Round Rock's water usage since January. It's easy to see how much more water we use during the summer than the rest of the year. The City's water utility system is designed to meet peak summer demand. That's why following the watering calendar is so important -- it spreads water use throughout the week, which means a lower peak. A lower peak means deferring system expansion costs, which are built into the rate you pay on your monthly bill.
It's been said Central Texas is pretty much in a perpetual state of drought, punctuated periodically by brief periods of heavy rainfall. This chart shows Round Rock's rainfall since January 2011. In an average year, we receive 37 inches of rain. We were 22.25 inches below average in 2011. Rainfall not only refills our lakes and the Edwards Aquifer -- the city's secondary source of water -- it gives our utility system a breather because we don't have to irrigate our lawns and gardens.