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Isleta Island Removal Project: Restoring Rio Grande Habitat

The project aims to restore the Rio Grande by removing islands below Isleta Diversion Dam, creating habitat for endangered species, and maintaining a year-round wet channel. It involves modeling, mobile-bed vs. fixed-bed modeling, inundation mapping, and addressing project uncertainties.

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Isleta Island Removal Project: Restoring Rio Grande Habitat

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  1. Pueblo of Isleta Island Removal Project Kyle Shour, E.I. – Tetra TechMay 6, 2014

  2. Water Trust Board Grant Agreement Scope and Objectives: • Removal of islands below the Isleta Diversion Dam • Restore this reach of the Rio Grande to the Traditional view of the Pueblo • Restore the connection between the shallow ground water aquifer and the river • Create habitat for the RGSM • 2 backwater features constructed • Being done upstream of the Isleta Diversion Dam

  3. Design Objectives • Maintain year-round wet channel along west bank • Integrate with restoration work at cultural site on west bank • Assess geomorphology • Model three flow events • Low flows to maintain flow against west bank • Mid-level flow to determine sediment transport • High-level flows to determine hydraulic design parameters • Endangered species habitat features • Remove invasive vegetation

  4. 2002

  5. 2005

  6. 2008

  7. 2012

  8. DesignPlan ViewCross-sectional View

  9. Modeling Tools • 1D vs 2D modeling • SRH-2D v. 30 • Public domain, hydraulics and sediment transport modeling available through USBR • Solves depth-averaged, 2D St. Venant equations • Calculates sediment transport capacity at each cell for each timestep using Engelund-Hansen equation, compares to supply • SMS v. 11.0 • Create hybrid mesh • Visualize & post-process model output

  10. Fixed-bed, Mobile-bed Modeling: Fixed-bed Model Mobile-bed Model • Comparison of existing and design hydraulic parameters • Results used to: • Size rip rap • Calculate scour • Comparison of existing and design bed elevation change, sediment concentration • Results used to evaluate sustainability

  11. Inundation Mapping: 100 cfs 1,200 cfs 3,000 cfs

  12. VelocityMapping 100 cfs 1,200 cfs

  13. Bed Elevation Change

  14. Project Uncertainties • Project is within a sediment laden and dynamic river system • Project life span subject to many elements beyond the control of either party • long term spring runoff events • short term thunderstorm events in upstream tributary arroyos • operations of the Isleta Diversion Dam

  15. Construction • Performed by AJAC Enterprises, Inc. • Removed ~70,000 cubic yards of material • NTP to substantial completion: 84 calendar days

  16. Completed Project

  17. Post-Construction Maintenance: • Removal of woody vegetation on benches on an annual basis • Removal of deposited sediment in channel on an as-needed basis depending on flows • Destabilize any emergent islands

  18. Questions? Thank You

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