Daily Reservoir and Pass-Thru Status Report
July 20, 2021
Reservoir Supply (AcFt); Stream Flow (AcFt); Evaporation (AcFt); Elevation (Ft); Rainfall (Inches); Temperature (°F); Gage Height (Ft MSL)
RESERVOIR STATISTICS
Effective June 24, 2017, updated total reservor capacities for Choke Canyon Reservoir (2012 TWDB Volumetric Survey) and
Lake Corpus Christi (2016 TWDB Volumetric Survey) are being reflected in the Daily Reservoir System and Pass-Thru Status Report
  Choke Canyon Reservoir Lake Corpus Christi CCR/LCC Combined Lake Texana
Date Elevation Volume % Capacity Elevation Volume % Capacity Volume % Capacity Elevation Volume % Capacity
FULL 220.5 662,821 100% 94.0 256,339 100% 919,160 100% 44.0 161,085 100%
07/20/2021 204.9 334,048 50.4% 93.1 238,806 93.2% 572,854 62.3% 44.0 161,085 100.0%
07/19/2021 205.0 335,741 50.7% 93.1 238,806 93.2% 574,547 62.5% 44.0 161,085 100.0%
06/20/2021 204.4 325,645 49.1% 91.8 214,326 83.6% 539,971 58.7% 44.0 161,085 100.0%
07/20/2020 200.9 269,701 40.7% 88.9 163,995 64.0% 433,696 47.2% 43.7 158,306 98.3%
LAKE TEXANA WATER SUPPLY*
* The split between Non-Interruptible and Interruptible amounts are updated monthly, usually the first working day of the month, so they reflect the total and remaining amounts as of the end of the previous month
Date Daily Intake MTD Non-Interuptible Interruptible
June YTD Remaining June YTD Remaining
07/19/2021 74 1,821 348 6,844 24,596 3,816 12,000 0
COLORADO RIVER WATER SUPPLY (CRWT)
Date Daily
Intake
MTD YTD Daily Flow MTD Flow Date Time Gage Height
07/19/2021 35 464 6,489 2,739 106,352 07/20/2021 7:15 AM 10.35
WEATHER RELATED INFORMATION
  Choke Canyon Reservoir Lake Corpus Christi CCR/LCC Combined
  07/19/2021 MTD YTD 07/19/2021 MTD YTD 07/19/2021 MTD YTD
Air Temp 91     93        
Evaporation 325 4,425 36,657 302 3,990 33,446 627 8,415 70,103
Rainfall 0.00 5.84 22.96 0.00 7.8 27.73      
Stream Flows
Gauging Station 07/19/2021 MTD
NTRT Nueces River at Three Rivers, Texas 594 26,760
NRTT Nueces River at Tilden, Texas 97 3,416
FRTT Frio River at Tilden, Texas 31 3,202
SMTT San Miguel Creek at Tilden, Texas 17 6,827
ARWT Atascosa River at Whitsett, Texas 62 13,535
CCR Release from Choke Canyon Reservoir 58 1,056
NRMT Nueces River at Mathis, Texas (La Fruta Bridge) 162 6,449
NCAT Nueces River at Calallen, Texas 18 17,738
RBP Rincon Bayou Pipeline 0 2,296
Reservoir InFlow
Computed as: (NTRT+FRTT+SMTT)-Release from Choke Canyon 583 35,732
ESTUARY INFLOWS AND PASSTHRU REQUIREMENTS
Target Passthru Monthly Target 4,500   1,125
Salinity Relief Credit 3,375 Effective 07/19/2021
Credit / -Deficit From Previous Month Date Deficit Satisfied   -6,416
Return Flow Credit Effective   500
Required Passthru Monthly Target 1,125   1,125
Reservoir Inflow 35,732
Estuary Inflows (NCAT + RBP) 20,034
Passthru Surplus / -Deficit 12,993
Report Generated 7/20/2021 at 3:25:00 PM