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Lake Ringgold Study
CITY OF WICHITA FALLS
COUNCIL MEETING
November 5, 2013
Lake Ringgold History
• 1957 – Water Right, Wichita
County WCID #1
– Water Supply for Wichita Falls

• 1958 – FNI study for Tarrant
County District
– Excess water from Ringgold

• 1962 – Water right for Lake
Arrowhead
Lake Ringgold History
• 1978 – 1981, FNI conducted studies on
additional supply for Wichita Falls
• Lake Ringgold
– Re-evaluated for smaller project
– Estimated system gain with Ringgold
27,640 af/y

• City of Wichita Falls began purchasing
properties in reservoir site
Recent Studies
• Region B Water Plan
– Recommended Strategy

• Reservoir Site Assessment
Study (2007)
– Unique Reservoir Designation
• Expires in 2015, unless progress toward
implementation
Current Study
• Joint Study – Wichita Falls and TRWD
– TRWD interested as terminal storage for Oklahoma water

Scope of Work
• Hydraulics and Conceptual Dam Design
– New PMF methodology
– Spillway configuration options

• Environmental Review
– New regulations

• Update Cost Estimate
Location Map
Lake Ringgold
Area = 16,000 acre
Capacity = 275,000 ac-ft
Lake Elevation = 844 ft

Henrietta
Lake Ringgold Comparison
• Lake Arrowhead
Elevation = 926 feet msl
Area = 15,000 acres*
Capacity = 236,000 acre-feet*
Yield = 29,000 ac-ft/year
*2001 Volumetric Survey
• Original area = 16,200 acres
• Original capacity = 262,100 acrefeet

• Lake Ringgold
Elevation = 844 feet msl
Area = 16,000 acres
Capacity = 275,000 acre-feet
Yield = 27,800 ac-ft/year
Dam Configuration
• Earthen Embankment
– Elevation – 871.5 feet msl
– Maximum height – 81.5 feet
– Length – 8,585 feet

• Uncontrolled Principal Spillway
– Elevation – 844 feet msl
– Crest width – 350 feet

• Emergency Spillway
–
–
–
–

Earthen channel
Elevation – 856 feet msl
Crest width – 500 feet
Discharge to Red River
Dam Site Layout
Conflicts
Oil/Gas pipelines
Henrietta’s pump station
Homes/structures
Roads

Property
owned by
Wichita Falls
Project Yield
• Firm Yield - 27,800 ac-ft/yr
• Environmental Flows – small impact on yield

• Lowest inflows – past 10 years
– Similar to drought in late ‘70s – early ‘80s
Environmental Review
Wetlands – 910 acres
Streams – 873,300 feet

Open water – 120 acres
Threatened and Endangered
Species
• Two federally listed species
– Low to no potential impacts

• Nine State listed species
– Low to no potential impacts to
7 species

• Potential impacts to Texas
Kangaroo Rat and Texas
Horned Lizard
– Both State listed threatened
Archeological Potential
• Few cultural resource surveys
• Favorable archeological site
conditions
• Tribal consultation is a
possibility

• Will require on-site field
survey
Project Costs
Millions

Land Purchase

$ 38

Dam and Spillway

$ 71.5

Conflicts

$

Permitting & Mitigation

$ 73.5

Contingency (20%)

$ 38

TOTAL

$ 228.5

7.4
Summary
• Lake Ringgold is a viable project
• Maximizes water supply from Little Wichita watershed
– Utilizes unique reservoir site
– Last viable option for new supplies for Wichita Falls

• Site supports dam location
– Geology and topography

• Can likely be constructed with local materials
• Minimizes potential liability – uncontrolled spillways
• Few environmental concerns
Summary - Unknowns
• Archeological potential
– Not a fatal flaw

• Stream mitigation
• On-going drought

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Lake Ringgold Study November 5 2013

  • 1. Lake Ringgold Study CITY OF WICHITA FALLS COUNCIL MEETING November 5, 2013
  • 2. Lake Ringgold History • 1957 – Water Right, Wichita County WCID #1 – Water Supply for Wichita Falls • 1958 – FNI study for Tarrant County District – Excess water from Ringgold • 1962 – Water right for Lake Arrowhead
  • 3. Lake Ringgold History • 1978 – 1981, FNI conducted studies on additional supply for Wichita Falls • Lake Ringgold – Re-evaluated for smaller project – Estimated system gain with Ringgold 27,640 af/y • City of Wichita Falls began purchasing properties in reservoir site
  • 4. Recent Studies • Region B Water Plan – Recommended Strategy • Reservoir Site Assessment Study (2007) – Unique Reservoir Designation • Expires in 2015, unless progress toward implementation
  • 5. Current Study • Joint Study – Wichita Falls and TRWD – TRWD interested as terminal storage for Oklahoma water Scope of Work • Hydraulics and Conceptual Dam Design – New PMF methodology – Spillway configuration options • Environmental Review – New regulations • Update Cost Estimate
  • 7. Lake Ringgold Area = 16,000 acre Capacity = 275,000 ac-ft Lake Elevation = 844 ft Henrietta
  • 8. Lake Ringgold Comparison • Lake Arrowhead Elevation = 926 feet msl Area = 15,000 acres* Capacity = 236,000 acre-feet* Yield = 29,000 ac-ft/year *2001 Volumetric Survey • Original area = 16,200 acres • Original capacity = 262,100 acrefeet • Lake Ringgold Elevation = 844 feet msl Area = 16,000 acres Capacity = 275,000 acre-feet Yield = 27,800 ac-ft/year
  • 9. Dam Configuration • Earthen Embankment – Elevation – 871.5 feet msl – Maximum height – 81.5 feet – Length – 8,585 feet • Uncontrolled Principal Spillway – Elevation – 844 feet msl – Crest width – 350 feet • Emergency Spillway – – – – Earthen channel Elevation – 856 feet msl Crest width – 500 feet Discharge to Red River
  • 11. Conflicts Oil/Gas pipelines Henrietta’s pump station Homes/structures Roads Property owned by Wichita Falls
  • 12. Project Yield • Firm Yield - 27,800 ac-ft/yr • Environmental Flows – small impact on yield • Lowest inflows – past 10 years – Similar to drought in late ‘70s – early ‘80s
  • 13. Environmental Review Wetlands – 910 acres Streams – 873,300 feet Open water – 120 acres
  • 14. Threatened and Endangered Species • Two federally listed species – Low to no potential impacts • Nine State listed species – Low to no potential impacts to 7 species • Potential impacts to Texas Kangaroo Rat and Texas Horned Lizard – Both State listed threatened
  • 15. Archeological Potential • Few cultural resource surveys • Favorable archeological site conditions • Tribal consultation is a possibility • Will require on-site field survey
  • 16. Project Costs Millions Land Purchase $ 38 Dam and Spillway $ 71.5 Conflicts $ Permitting & Mitigation $ 73.5 Contingency (20%) $ 38 TOTAL $ 228.5 7.4
  • 17. Summary • Lake Ringgold is a viable project • Maximizes water supply from Little Wichita watershed – Utilizes unique reservoir site – Last viable option for new supplies for Wichita Falls • Site supports dam location – Geology and topography • Can likely be constructed with local materials • Minimizes potential liability – uncontrolled spillways • Few environmental concerns
  • 18. Summary - Unknowns • Archeological potential – Not a fatal flaw • Stream mitigation • On-going drought