Daily Reservoir and Pass-Thru Status Report
December 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%
12/20/2021 202.3 291,453 44.0% 91.3 205,177 80.0% 496,630 54.0% 43.9 160,156 99.4%
12/19/2021 202.3 291,453 44.0% 91.4 206,995 80.8% 498,448 54.2% 43.9 160,156 99.4%
11/20/2021 202.6 296,231 44.7% 91.6 210,649 82.2% 506,880 55.1% 43.4 155,551 96.6%
12/20/2020 198.5 234,978 35.5% 86.9 133,270 52.0% 368,248 40.1% 44.0 161,085 100.0%
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
November YTD Remaining November YTD Remaining
12/19/2021 130 2,449 3,960 24,564 6,876 0 12,000 0
COLORADO RIVER WATER SUPPLY (CRWT)
Date Daily
Intake
MTD YTD Daily Flow MTD Flow Date Time Gage Height
12/19/2021 0 0 9,327 1,707 24,618 12/20/2021 7:15 AM 8.96
WEATHER RELATED INFORMATION
  Choke Canyon Reservoir Lake Corpus Christi CCR/LCC Combined
  12/19/2021 MTD YTD 12/19/2021 MTD YTD 12/19/2021 MTD YTD
Air Temp 48     51        
Evaporation 46 2,455 75,111 116 2,327 67,609 162 4,782 142,720
Rainfall 0.06 0.11 28.46 0.28 0.38 38.57      
Stream Flows
Gauging Station 12/19/2021 MTD
NTRT Nueces River at Three Rivers, Texas 54 1,240
NRTT Nueces River at Tilden, Texas 0 0
FRTT Frio River at Tilden, Texas 0 2
SMTT San Miguel Creek at Tilden, Texas 0 0
ARWT Atascosa River at Whitsett, Texas 6 136
CCR Release from Choke Canyon Reservoir 58 1,094
NRMT Nueces River at Mathis, Texas (La Fruta Bridge) 119 2,807
NCAT Nueces River at Calallen, Texas 0 20
RBP Rincon Bayou Pipeline 0 0
Reservoir InFlow
Computed as: NRTT+FRTT+SMTT+ARWT 6 224
ESTUARY INFLOWS AND PASSTHRU REQUIREMENTS
Target Passthru Monthly Target 4,500   4,500
Salinity Relief Credit 0 Effective  
Credit / -Deficit From Previous Month Date Deficit Satisfied 12/01/2021 1,974
Return Flow Credit Effective   500
Required Passthru Monthly Target 4,500   224
Reservoir Inflow 224
Estuary Inflows (NCAT + RBP) 20
Passthru Surplus / -Deficit 0
Report Generated 12/20/2021 at 9:26:02 AM