December 6, 2016 Phase 2 Project Kickoff Meeting Overview Phase 1: - PowerPoint PPT Presentation

30-Percent Engineering Design Services for the New Mexico Unit of Central Arizona Project December 6, 2016 Phase 2 – Project Kickoff Meeting

Overview – Phase 1: Scope and Findings Summary – Phase 2: Scope, Schedule, and Deliverables – Gila Diversion Preliminary Findings 30 Percent Engineering Design Services for 2 New Mexico Unit of Central Arizona Project

Phase 1: Scope and Findings

Phase 1 – Scope Summary Scope Develop Screening Criteria for Diversion and Storage Concepts along the Gila and Mogollon – Storage: reservoirs and ASR – Diversions: open channel, pipelines, and pumping – Assess environmental impacts 30 Percent Engineering Design Services for 4 New Mexico Unit of Central Arizona Project

Phase 1 – Selected Alternative 30 Percent Engineering Design Services for 5 New Mexico Unit of Central Arizona Project

Phase 1 – Selected Alternative Alternative 4 (Selected Alternative) Initial Phase – Diversion of 150 cfs – Flood infiltration and storage with additional basins in the Cliff-Gila Valley – Ranney Wells – Construct Winn Reservoir and Diversion to 3,845 AF – Pipeline and pumping to the Upper Gila ditch 30 Percent Engineering Design Services for 6 New Mexico Unit of Central Arizona Project

Phase 2 – Scope, Schedule, and Deliverables

Phase 2 – Scope, Schedule, and Deliverables Scope – Diversion – ASR ground water model – ASR geotechnical investigation – ASR down valley sites – Agency requirements – Additional work 30 Percent Engineering Design Services for 8 New Mexico Unit of Central Arizona Project

Phase 2 – Schedule Project Milestones – Task 6 – Project Management NTP – 11/7/2016 – Task 7 – Diversions NTP – 11/7/2016 – Draft Report Submitted 12/2/2016 – Task 8 – Coordination Meeting NTP - TBD – Task 9 – ASR Ground Water Model NTP – TBD – Task 10 – Geotechnical Investigation NTP - TBD – Task 11 – ASR Down Valley Sites NTP – TBD – Task 12 – Agency Coordination NTP - TBD 30 Percent Engineering Design Services for 9 New Mexico Unit of Central Arizona Project

Phase 2 – Deliverables Deliverables – Diversion Report – ASR Numerical Model – ASR Geotechnical Report – Down Valley ASR Observations Memorandum – Permitting Summary Memorandum 30 Percent Engineering Design Services for 10 New Mexico Unit of Central Arizona Project

Gila Diversion Preliminary Findings

Gila Gage Diversion Site – Gila Stream Gage • USGS 09430500 – Land Ownership • US Forest Service (USFS) o No diversion activities on USFS lands • TNC & State of New Mexico o Co-ownership o National Lands Protection Act (NLPA) – Access Road Improvements • Regrade slopes >12% • Crossing of Mogollon Creek • Construction & maintenance 30 Percent Engineering Design Services for 12 New Mexico Unit of Central Arizona Project

Conceptual Diversion Alternatives Criteria

Site Evaluation Criteria – Available Head • Highest point below USFS boundary – All Weather Access • Except during flooding events – Structural Stability • Key diversion to bedrock – Lateral & Vertical Channel Stability • Bedrock along both banks • Observed channel degradation 30 Percent Engineering Design Services for 14 New Mexico Unit of Central Arizona Project

Design Alternatives Selection Criteria – Structure Design • Grouted boulder vs. cast concrete • Adjustable vs. fixed invert • At grade vs. surface water intake – Sediment Transport http://www.wildlife.state.nm.us/fishing/game-fish/cold-water/ • Promote sediment continuity – Upstream Fish Passage • Prevent erosion & sedimentation • Design to T&E species requirements • Minimize limiting velocities & depths – Structure Bypass • Maintain design channel alignment – Downstream Navigability • Prevent future channel avulsion • Minimize recreational hazards 30 Percent Engineering Design Services for 15 New Mexico Unit of Central Arizona Project

Conceptual Diversion Alternatives 30% Design

Engineered Riffle Diversion – Invert 4662 ’ to 4666’ – Grouted Boulder or Concrete – Cast Concrete Walls – Elongated Riffle Rundown – Riprap Bank Protection – Bedload Deflection – Fish & Debris Exclusion – Sediment Sluicing – Surface Conveyance Canal 30 Percent Engineering Design Services for 17 New Mexico Unit of Central Arizona Project

Engineered Riffle Diversion – Pros • Cost to construct • Fewer mechanical systems • Reduced power requirements • Recreational navigation – Cons • Non-adjustable invert • Static sediment management • No fish passage channel • Reduced flood flow conveyance Engineered Riffle: Kremlin, CO 30 Percent Engineering Design Services for 18 New Mexico Unit of Central Arizona Project

Obermeyer Pneumatic Gates Diversion – Gates Raised 4662 ’ to 4666’ – Cast Concrete Sill & Walls – Riprap Bank Protection – Mechanical Infrastructure • Steel gates, pneumatic lines, bladders, compressors, operations controls & housing – Bedload Deflection – Fish & Debris Exclusion – Sediment Sluicing – Surface Conveyance Canal 30 Percent Engineering Design Services for 19 New Mexico Unit of Central Arizona Project

Obermeyer Pneumatic Gates Diversion – Pros • Adjustable invert • Dynamic sediment flushing • Fish passage opportunities • Flood flow conveyance – Cons • Cost to construct • Mechanical systems maintenance • Additional power requirements Albuquerque Diversion Dam: http://mapio.net/pic/p-5170793/ 30 Percent Engineering Design Services for 20 New Mexico Unit of Central Arizona Project

Combination Coanda Screen & Obermeyer Pneumatic Gate Diversion – Gates Raised 4662 ’ to 4666’ – Cast Concrete Sill & Walls – Riprap Bank Protection – Coanda Screens • 1 mm opening – Water Collection Vaults – Mechanical Infrastructure • Steel gates, pneumatic lines, bladders, compressors, operations controls & housing – Sediment Sluicing – Subgrade Conveyance Culvert 30 Percent Engineering Design Services for 21 New Mexico Unit of Central Arizona Project

Combination Coanda Screen & Obermeyer Pneumatic Gate Diversion – Pros • Partially adjustable invert • Limited sediment flushing • Sediment & debris exclusion • Fish passage opportunities – Cons • Cost to construct • Mechanical systems maintenance • Sedimentation in vaults • Reduced head for conveyance • Additional power requirements http://www.elginindustries.com/equipment_group/norris_screen/products/product_line/Norri s_Screen/stainless_steel_screening_systems/coanda_screen 30 Percent Engineering Design Services for 22 New Mexico Unit of Central Arizona Project

Channel Response to Historic Changes in the River System

River Channel Modifications in the Cliff-Gila Valley – Channelization – Disconnection of Floodplain • Straightening & leveeing • Reduced overbank flood storage • Steeper channel slopes • Loss of vegetation & bank stability 30 Percent Engineering Design Services for 24 New Mexico Unit of Central Arizona Project

Dynamic Channel Response in Cliff-Gila Valley – Independent of Flood Severity – Vertical Channel Instabilities • Upstream degradation o Headcutting • Downstream aggradation o Braiding – Lateral Channel Instability • Bank erosion & failure • Channel avulsion 30 Percent Engineering Design Services for 25 New Mexico Unit of Central Arizona Project

Observed Channel Response at Gila Gage Site – Ongoing Channel Incision • Propagation of headcuts initiated downstream – Channel Abandonment • Historically irrigated fields • Fluvial landforms • USGS stream gage facility – Lowered Shallow Water Table • Perched riparian vegetation • Expanded upland conditions 30 Percent Engineering Design Services for 26 New Mexico Unit of Central Arizona Project

Ecological & Functional Restoration of the Gila River

Intent of Reach-Scale Channel Restoration – Re-elevate Incised Channel – Restore Stable Channel Geometries – Reduce Over-steepened Banks – Reconnect Abandoned Floodplains – Raise Shallow Water Tables – Reestablish Native Riparian Zones 30 Percent Engineering Design Services for 28 New Mexico Unit of Central Arizona Project

Pros & Cons of Restoration to Diversion Project – Improve River Function • Vertical & lateral channel stability • Sediment continuity of reach – Raise Diversion Elevations • Gravity feed ASR infiltration fields – Restore Aquatic & Riparian Habitats • T&E species – Benefit River Based Recreation • Existing hazards – Disadvantages of Restoration • Increased project cost • Temporary construction impacts 30 Percent Engineering Design Services for 29 New Mexico Unit of Central Arizona Project

Next Steps

Recommended Path Forward – Continued Fluvial Geomorphic – Field Investigations for ASR Analysis – Stream Restoration Evaluation – Additional Hydraulic Modeling – Initiate Sediment Transport Modeling 30 Percent Engineering Design Services for 31 New Mexico Unit of Central Arizona Project

Questions? December 6, 2016