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Lake Corpus Christi/ Choke Canyon Water Rights Permit & Reservoir Operating Plan/Water Use Projections and Current Major Projects Eduardo Garaña, P.E.

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Presentation on theme: "Lake Corpus Christi/ Choke Canyon Water Rights Permit & Reservoir Operating Plan/Water Use Projections and Current Major Projects Eduardo Garaña, P.E."— Presentation transcript:

1 Lake Corpus Christi/ Choke Canyon Water Rights Permit & Reservoir Operating Plan/Water Use Projections and Current Major Projects Eduardo Garaña, P.E. Director-Water Department October 15, 2003

2 Key Dates/Events May City of Corpus Christi applied for Choke Canyon Water Rights. May City of Corpus Christi applied for Choke Canyon Water Rights. October Texas Water Rights Commission issued Choke Canyon Water Rights Permit with freshwater inflow requirements. October Texas Water Rights Commission issued Choke Canyon Water Rights Permit with freshwater inflow requirements. June Choke Canyon Dam construction completed. June Choke Canyon Dam construction completed. May Choke Canyon Water Right Permit adjudicated, May Choke Canyon Water Right Permit adjudicated, June Choke Canyon filled and spilled the first time. June Choke Canyon filled and spilled the first time.

3 Key Dates/Events (Cont.) December Letter received by the TNRCC questioning freshwater inflows. December Letter received by the TNRCC questioning freshwater inflows. May TNRCC ordered City to begin freshwater inflows to Bays and Estuaries. May TNRCC ordered City to begin freshwater inflows to Bays and Estuaries. March TNRCC Agreed Order amended interim operational procedures and created NEAC. March TNRCC Agreed Order amended interim operational procedures and created NEAC. April TNRCC Agreed Order amends operational procedures and continues NEAC. April TNRCC Agreed Order amends operational procedures and continues NEAC. April TNRCC Agreed Order amends operational procedures and continues NEAC. April TNRCC Agreed Order amends operational procedures and continues NEAC.

4 Choke Canyon Water Rights Permit # 3358 Special Condition 5 (b): “Following completion and filling of Choke Canyon Dam and reservoir, scheduled releases shall be made from the reservoir system at Lake Corpus Christi Dam together with return flows to the estuaries for the proper ecological environment and health of related living resources therein. …”

5 Choke Canyon Water Rights Permit # 3358 Special Condition 5 (b)(cont): “... Water provided to the estuaries from the reservoir system under this paragraph shall be released in such quantities and in accordance with such operational procedures as may be ordered by the Commission. Permittees shall provide not less than 151,000 acre-feet of water per annum for the estuaries by a combination of releases and spills from the reservoir system at the Lake Corpus Christi Dam and return flows to Nueces and Corpus Christi Bays and other receiving estuaries.”

6 Certificate of Adjudication No , Special Condition 5.b. Be not less than 151,000 acre-feet annually Be not less than 151,000 acre-feet annually Begin after Choke Canyon fills for the first time Begin after Choke Canyon fills for the first time Be in accordance with operational procedures as ordered by the Commission (now TNRCC) Be in accordance with operational procedures as ordered by the Commission (now TNRCC) Be a combination of spills, releases and return flows Be a combination of spills, releases and return flows Federal 404 Permit includes freshwater inflow requirement. Federal 404 Permit includes freshwater inflow requirement. Special Condition 5.b: Special Condition 5.b: –Requires permit holders to provide freshwater inflows to the Nueces Estuary “for the proper ecological environment and health of related living marine resources therein.” –States that freshwater inflows shall:

7 Creates NEAC Whose Mission is to “Consider Such Additional Information and Related Issues and to Formulate Recommendations for the Commission’s Review and Actions.” Amended the 1990 Reservoir System Operational Procedures by Establishing a Monthly Schedule of Required Inflow Amounts. Amended the 1990 Reservoir System Operational Procedures by Establishing a Monthly Schedule of Required Inflow Amounts. – 97,000 acft/yr. total to Nueces Bay – 500 acft/mo. return flow credits 1992 Agreed Order

8 1995 Agreed Order Limits amount of “releases” to amount of reservoir system inflows, up to a monthly estuary inflow target Limits amount of “releases” to amount of reservoir system inflows, up to a monthly estuary inflow target –Targets essentially the same as previous release schedule. –“Pass-through” reservoir inflows up to monthly target. –Reservoir inflows above monthly target are captured & stored. –If reservoir inflows are less than monthly target, only inflow amount is “passed through.” –No requirement to “release” stored water to make up the difference. Monthly targets reduced when salinity is in desirable range. Monthly targets reduced when salinity is in desirable range. Credits for excess pass-through’s in one month carried to next. Credits for excess pass-through’s in one month carried to next. Drought contingency provisions drastically reduce targets during low flow periods. Drought contingency provisions drastically reduce targets during low flow periods.

9 2001 Agreed Order Diverts Pass-through’s and Other Inflows to Nueces Delta Diverts Pass-through’s and Other Inflows to Nueces Delta –Nueces River Overflow Channel into Rincon Bayou. –Pipeline from Calallen Pool to Rincon Bayou. Provides for Automatic Measures and Relief Provides for Automatic Measures and Relief –50%: Increased Public Awareness. –40%: Restrict Time-of-Day Lawn Watering. (Inflow Targets Reduced to 1,200 af/mo) (Inflow Targets Reduced to 1,200 af/mo) –30%: Restrict Lawn Watering to No More Than Once Every 5 Days. (Inflow Targets Suspended) (Inflow Targets Suspended)

10 Agreed Order Summary The City of Corpus Christi, as Operator of the Reservoir System, shall provide not less than 151, 000 ac-ft of water per annum for the estuaries The City of Corpus Christi, as Operator of the Reservoir System, shall provide not less than 151, 000 ac-ft of water per annum for the estuaries >70% storage capacity—138,000 ac-ft target >40% but less than 70%--97,000 ac-ft target >30% but less than 40%-- 1,200 ac-ft target* <30%-- Total suspension of Pass-thrus* * Implementation of Lawn Watering Restrictions

11 Agreed Order Summary (cont.) Additional Relief Options: Additional Relief Options: >Flows in excess of monthly targets >Salinity levels in Upper Nueces Bay Water Conservation and Drought Contingency Plans for Customers Water Conservation and Drought Contingency Plans for Customers

12 CORPUSCHRISTI SANANTONIO AUSTIN HOUSTON Wesley Seale Dam Completed – 1958 Wesley Seale Dam Completed – 1958 Choke Canyon Dam Completed – 1982 Choke Canyon Dam Completed – 1982 LAREDO Nueces River Basin Frio River Basin EAGLEPASS DELRIO UVALDE LEAKEY NuecesRiver FrioRiver AtascosaRiver Sources of Nueces River Basin Water Supply

13 Current Operating Policy Revised during drought. Revised during drought. …..in order to provide maximum dependable yield from the two reservoirs, the water level in Lake Corpus Christi will be allowed to drop to elevation 74 feet before water is released from Choke Canyon Reservoir….. When the elevation of Choke Canyon Reservoir drops to 155 feet, Lake Corpus Christi will be lowered to its minimum elevation. …..in order to provide maximum dependable yield from the two reservoirs, the water level in Lake Corpus Christi will be allowed to drop to elevation 74 feet before water is released from Choke Canyon Reservoir….. When the elevation of Choke Canyon Reservoir drops to 155 feet, Lake Corpus Christi will be lowered to its minimum elevation.

14 Lake Corpus Christi Reservoir Wholesale Water Providers Alice Pipeline 1964 Alice Pipeline 1964 Beeville Pipeline 1982 Beeville Pipeline 1982 Mathis Pipeline 1982 Mathis Pipeline 1982

15 Choke Canyon / Lake Corpus Christi Reservoir System Daily Pass-Through Status Report Report Date: May 28, 2002 RESERVOIR STATISTICS

16 Weather Related Information

17 STREAM FLOWS

18 USGS Gauge Locations NRMT

19 ESTUARY INFLOWS and PASSTHRU REQUIREMENTS (All values are in AcFt)

20 LAKE TEXANA STATISTICS (All values are in AcFt)

21 EFFECT OF CHANGES TO AGREED ORDER

22 WATER UTILIZATION

23 Benefits of Lake Texana Water on Reservoir Storage Since Mary Rhodes Pipeline Startup Year Historical Without Lake Texana (Estimated) E n d o f M o n t h S y s t e m S t o r a g e

24

25 Background (cont.) Water provided to the estuaries from the reservoir system under this paragraph shall be released in such quantities and in accordance with such operational procedures as may be ordered by the Commission. Permittees shall provide not less than 151,000 acre-feet of water per annum for the estuaries by a combination of releases and spills from the reservoir system at the Lake Corpus Christi Dam and return flows to Nueces and Corpus Christi Bays and other receiving estuaries. Water provided to the estuaries from the reservoir system under this paragraph shall be released in such quantities and in accordance with such operational procedures as may be ordered by the Commission. Permittees shall provide not less than 151,000 acre-feet of water per annum for the estuaries by a combination of releases and spills from the reservoir system at the Lake Corpus Christi Dam and return flows to Nueces and Corpus Christi Bays and other receiving estuaries.

26 Background (cont.) Construction Completed 1982 Construction Completed 1982 Inundation Occurred 1987 Inundation Occurred 1987 Letter of Inquiry Received 1989 Letter of Inquiry Received 1989 Texas Water Commission Took Jurisdiction in Spring 1990 Texas Water Commission Took Jurisdiction in Spring 1990 Creation of Technical Advisory Committee Creation of Technical Advisory Committee TAC—Characterization Study and Final Report to Hearings Examiner TAC—Characterization Study and Final Report to Hearings Examiner

27 Water Use Projections for Corpus Christi Regional Water System

28 Demand

29 Projection Comparison City and TWDB acre-feet

30 Projected and Recent Actual Demand

31 Supply

32 Reservoir System Yield That amount of water that the reservoir (or reservoir system) could have produced annually if it had been in place during the worst drought of record.

33 Reservoir System Inflows- Lowest 3 Year Periods acre-feet

34 Reservoir System Yield Modeling Assumptions Firm yield assumption- reservoir is used till empty Firm yield assumption- reservoir is used till empty Safe yield assumption- reservoir is left with a volume of reserve supply (6 months of supply) Safe yield assumption- reservoir is left with a volume of reserve supply (6 months of supply)

35 0 50, , , , , , Time (Non-Successive Years) System Yield (acft/yr) Firm Yield CCR/LCC System (1992 – 2001)

36 Total Supply (2003) } Texana CCR / LCC Firm Yield 237, ,932 acre-feet Safe Yield }

37 Total Supply Projection (Current Sources) acre-feet

38 Demand and Supply acre-feet

39 Projected and Actual Combined Demand and Supply

40 Demand and Supply

41 Summary Demand = Supply 2028 Safe Yield/ Higher Demand 2034 Safe Yield/ Lower Demand 2038 Firm Yield/ Higher Demand 2052 Firm Yield/ Lower Demand

42 Future Actions Continue to use multiple projection methodologies Continue to use multiple projection methodologies Compare city’s projections to TWDB’s and other available projections Compare city’s projections to TWDB’s and other available projections Continue to update projections on a one-year planning cycle Continue to update projections on a one-year planning cycle Optimize existing water supply sources Optimize existing water supply sources Continue to develop future water supply sources Continue to develop future water supply sources

43 City of Corpus Christi Desalination Initiatives

44 Padre Island Desalination Project

45 Preferred RO Facility: Padre Island Pump Station / Nueces County Packery Channel Park Preferred Source Well Location: City-Leased TGLO Land at Packery Channel Alternate RO Facility Location: At NCWCID4 Pumping Station Preferred ASR Well Location: Near Nueces County Padre Balli Park along South Padre Island Drive Alternate ASR Well Location: Mid-Mustang Island Preferred Facility Siting

46 Recommended Project 3.0-mgd project includes: 3.0-mgd project includes: –Chicot Aquifer Horizontal Directionally-Drilled well field –1.0-mgd RO facility (with buildings and infrastructure to support 5-mgd) –2.0-mgd ASR capacity –By-Product Disposal via Deep Well Injection (with sufficient capacity to handle 5.0 mgd) –Site work and transmission piping –Upgrades to existing Padre Island Pumping Station –Estimated cost: $23.2 million including contingencies (June 2003 dollars,  30 percent) Subject to verification/refinement based on results of hydrogeologic and water quality testing program Subject to verification/refinement based on results of hydrogeologic and water quality testing program

47 State Desalination Initiative

48 Why Coastal Bend? Why Corpus Christi? Largest Gulf-front City with a Strategic Port in Texas Largest Gulf-front City with a Strategic Port in Texas Largest Industrial City in Attainment Status for Air Quality Largest Industrial City in Attainment Status for Air Quality Progressive and History of Long-range Water Planning Progressive and History of Long-range Water Planning – Mary Rhodes Pipeline – Water demands met through 2050 Regional Water System Regional Water System Proximity to Users Proximity to Users Local and Regional Support Local and Regional Support

49 City of Corpus Christi and Coastal Bend City of Corpus Christi and Coastal Bend Serves 75% of M&I Demand for Region N Serves 75% of M&I Demand for Region N Supply Water to Suppliers in Seven Counties Supply Water to Suppliers in Seven Counties Existing Municipal Customers Existing Municipal Customers Existing Industrial Customers Existing Industrial Customers – Koch/Flint Hills, Citgo, Valero, Coastal, Equistar – Power Generation Potential to Supply Future Customers Potential to Supply Future Customers City of Corpus Christi Regional Water System

50 Corpus Christi and Regional Water System

51 25 mgd seawater desalination facility 25 mgd seawater desalination facility Located at Barney Davis Power Plant Located at Barney Davis Power Plant Deliver potable water to Corpus Christi Regional Water System Deliver potable water to Corpus Christi Regional Water System Ability to Expand Ability to Expand Existing Marine R&D facilities Existing Marine R&D facilities – Hart Foundation – A&M – UTMSI Texas Coastal Bend Project Description

52 Barney Davis Plant Site and Corpus Christi Distribution System Oso Bay A&M /UTMSI Existng Marine Research Facilities A&M /UTMSI Existing Marine Research Facilities

53 Barney Davis Intake Outfall 1.5 mile Pipeline

54 COE Nueces River Basin Feasibility Study

55 US Army Corps of Engineers Reconnaissance Study of the Nueces Basin Watershed Federal funds are available through Corps of Engineers (COE) for projects which include “Ecosystem Restoration” or “Flood Damage Reduction” Federal funds are available through Corps of Engineers (COE) for projects which include “Ecosystem Restoration” or “Flood Damage Reduction” Federal funds can pay for up to 50% of study cost and 65% of construction costs Federal funds can pay for up to 50% of study cost and 65% of construction costs Projects can include water supply Projects can include water supply Federal funds are available through Corps of Engineers (COE) for projects which include “Ecosystem Restoration” or “Flood Damage Reduction” Federal funds are available through Corps of Engineers (COE) for projects which include “Ecosystem Restoration” or “Flood Damage Reduction” Federal funds can pay for up to 50% of study cost and 65% of construction costs Federal funds can pay for up to 50% of study cost and 65% of construction costs Projects can include water supply Projects can include water supply

56 Hill Country Streams and Associated Springs Important Ecosystems Dependant on Nueces River System Nueces Delta and Estuary 15

57 US Army Corps of Engineers Reconnaissance Study Identified 10 Projects –Flooding downstream of Lake Corpus Christi and throughout the Nueces Basin –Recharge enhancement –Cotulla diversion projects to enhance storage in LCC/CCR system –Two-way pipe project to enhance storage in LCC/CCR system –Desalination –Treated effluent placement in Nueces Delta –Water quality in Choke Canyon reservoir –Stream restoration in the upper Nueces Basin –Brush management –Exotic aquatic plant removal –Flooding downstream of Lake Corpus Christi and throughout the Nueces Basin –Recharge enhancement –Cotulla diversion projects to enhance storage in LCC/CCR system –Two-way pipe project to enhance storage in LCC/CCR system –Desalination –Treated effluent placement in Nueces Delta –Water quality in Choke Canyon reservoir –Stream restoration in the upper Nueces Basin –Brush management –Exotic aquatic plant removal

58 Projects Selected to Move Forward to Feasibility Phase Desalination project at Barney Davis Desalination project at Barney Davis Cotulla diversion to enhance Choke Canyon storage Cotulla diversion to enhance Choke Canyon storage Two-way pipe project between CCR and LCC to minimize channel losses Two-way pipe project between CCR and LCC to minimize channel losses Additional wastewater diversions to Nueces River Delta Additional wastewater diversions to Nueces River Delta Recharge enhancement projects with appropriate mitigation for City Recharge enhancement projects with appropriate mitigation for City Brush control Brush control Desalination project at Barney Davis Desalination project at Barney Davis Cotulla diversion to enhance Choke Canyon storage Cotulla diversion to enhance Choke Canyon storage Two-way pipe project between CCR and LCC to minimize channel losses Two-way pipe project between CCR and LCC to minimize channel losses Additional wastewater diversions to Nueces River Delta Additional wastewater diversions to Nueces River Delta Recharge enhancement projects with appropriate mitigation for City Recharge enhancement projects with appropriate mitigation for City Brush control Brush control

59 Study Participants Co-sponsors Co-sponsors –Army Corps of Engineers –City of Corpus Christi –San Antonio Water System (SAWS) –San Antonio River Authority (SARA) –Guadalupe Blanco River Authority (GBRA) –Nueces River Authority (NRA) Other Interested Parties Other Interested Parties –Edwards Aquifer Authority (EAA) –Region N Water Planning Group (Region N) Co-sponsors Co-sponsors –Army Corps of Engineers –City of Corpus Christi –San Antonio Water System (SAWS) –San Antonio River Authority (SARA) –Guadalupe Blanco River Authority (GBRA) –Nueces River Authority (NRA) Other Interested Parties Other Interested Parties –Edwards Aquifer Authority (EAA) –Region N Water Planning Group (Region N)

60 City Permitting Requirements, Time and Effort Planned Padre Island Desalination Padre Island Desalination –Permits for hydro-geologic borings and permit validation studies –Allowance of $1M, 100 percent City Expense Two Desalination Projects at Barney Davis Two Desalination Projects at Barney Davis –Expected to benefit from TWDB’s RW Beck Report –South-most Brackish, Freeport, Padre Island Experience will be used

61 Permitting Requirements City Time and Effort Planned Cont. Additional Wastewater Diversions to the Nueces Delta Additional Wastewater Diversions to the Nueces Delta –City has expended extensive time and resources to investigate and establish baseline information for use in possible expansion wastewater diversion projects.

62 Questions?


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