Canyon Lake was 96.1% full on Oct. 30, while its surface stood 1.81 feet below its conservation pool.
The two figures describe the same reservoir in different units: the Texas Water Development Board reports the share of conservation storage filled, and the U.S. Army Corps of Engineers reports the water-surface elevation against the conservation-pool level.
The Corps measured the lake at 907.19 feet at midnight CDT on Oct. 30. Its report shows a 0.14-foot decline over the preceding 24 hours. A high storage percentage and an elevation below the conservation pool can both be true; neither figure measures groundwater at the Edwards Aquifer's J-17 well or flow at Comal Springs.
The Edwards readings have a different date
The Oct. 29 EAA update puts the J-17 ten-day average at 638.6 feet and Comal Springs' ten-day average at 144 cubic feet per second. Those are an aquifer-well level and a springflow rate, respectively, rather than alternate measures of Canyon Lake's fullness. Their ten-day averaging period also differs from the Corps' single midnight lake reading.