PRESENTATION OVERVIEW Background Design Construction Operation Takeaways Questions

PROJECT BACKGROUND Crow Irrigation Project (CIP) work commenced 1885 Source: http://ctwrd.com/DidYouKnow.html Crow Irrigation Project (CIP) work commenced 1885 US Reclamation Services: Up until 1922 Bureau of Indian Affairs: 1922 – present 11 units Surface water sources Source: http://ctwrd.com/DidYouKnow.html Source: http://ctwrd.com/DidYouKnow.html

PROJECT BACKGROUND

PROJECT BACKGROUND Condition Assessment Funding Implementation Completed in 2005 and updated in 2007 Funding Crow Tribal Water Right Settlement Act of 2010 Implementation 638 Contract between Crow Tribe and Bureau of Reclamation

PROJECT DESIGN – EXISTING CONDITIONS Reno Diversion Dam and Headworks: Diversion Dam 80 foot reinforced concrete sill with stoplogs Headworks Reinforced concrete structure 85 cfs design capacity Measurement Parshall flume Deficiencies: Safety Structural Operational

PROJECT DESIGN – EXISTING CONDITIONS http://www.usbr.gov/gp/multimedia/cti_groundbreaking/content/images/full/groundbreaking_01.JPG

PROJECT DESIGN – EXISTING CONDITIONS

Mean Monthly Flows (CFS) PROJECT DESIGN – EXISTING CONDITIONS Little Bighorn River: Monthly Mean Flows USGS Station 062940000 1953 - 2015 Upstream River Channel Increasing upstream water surface comes with risk Source: US Geological Survey Mean Monthly Flows (CFS) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 135 188 299 298 614 839 264 117 126 152 149 131

PROJECT DESIGN – REQUIREMENTS Divert water from Little Bighorn River Provide delivery water surface during low flows Handling flood flows Handling debris in river: Floating Sediment Measure water diversions Safety and O&M

PROJECT DESIGN – ALTERNATIVES Diversion Dam Obermeyer gate Inflatable rubber dam system (rubber dam) Radial gate Concrete ogee crest Stoplogs Headworks Replacement Water Measurement Calibrate slide gates

PROJECT DESIGN – ADVANTAGES Diversion Dam: Retain usable portion of structure Automation Handle flood flows Delivery water surface during low flows Rubber dam for floating debris Radial gate for sluicing sediment Minimal O&M in river and addresses safety concerns Headworks and Ramp Flume: New structures

PROJECT DESIGN – DISADVANTAGES Diversion Dam: Higher initial cost Life expectancy for rubber bladder Requires power source Potential for damage Requires trained operators Headworks and Ramp Flume:

PROJECT DESIGN – RUBBER DAM vs. OBERMEYER GATE http://patentyogi.com/american-inventor/this-day-in-patent-history-the-iconic-imbertson-inflatable-gate-was-patented-on/ http://www.huaxiarubber.com/uploadfile/20120203144348767.jpg http://www.cvea.org/resources/pdfs/Projects%20Page/allisonFinalFeasibilityStudyAddendum%20Final%20Report1-11.pdf

PROJECT DESIGN – RUBBER DAM vs. OBERMEYER GATE Rubber Dam Advantages: Lower initial cost Lower operating pressure (1-5 verses 15+ psi) Can handle minor leaks Debris bounces off Simplicity Can be patched in the field Obermeyer Gate Advantages: Protection from debris

PROJECT DESIGN – RUBBER DAM http://www.water-technology.net/contractors/environmental/yooil/yooil3.html PROJECT DESIGN – RUBBER DAM http://en.wikipedia.org/wiki/Alterra_Power#mediaviewer/File:Toba_Montrose_Run_of_River_Hydro_Power_Plant_Intake.jpg http://www.usbr.gov/projects/Facility.jsp?fac_Name=Dodson+Diversion+Dam http://www.dyrhoff.co.uk/our-products/inflatable-rubber-dams/ http://www.hydrotech-eng.com/equipment/rubber-dams/

PROJECT DESIGN – OBERMEYER GATE http://www.obermeyerhydro.com/SpillwayGates http://www.obermeyerhydro.com/SpillwayGates http://www.obermeyerhydro.com/cold_climate_water_control http://www.woodrodgers.com/services/structural/hydraulic-structures/brooktrails-lake/

PROJECT DESIGN – DIVERSION DAM & HEADWORKS Rubber Dam: Single bladder/anchor system Maintain 3.35 foot water surface Inflate in 30 minutes PLC – based upstream water level control system Two pre-approved manufacturers: YOOIL Engineering HTE Engineering

PROJECT DESIGN – DIVERSION DAM & HEADWORKS Radial Gate: Reinforced concrete sluiceway 10’ x 10’ radial gate with motor operator Headworks Reinforced concrete headworks Double 8’ x 6’ box culvert 72” x 60” stainless steel slide gates (2)

PROJECT DESIGN – DIVERSION DAM & HEADWORKS

PROJECT CONSTRUCTION – GENERAL General Contractor: NW Construction, Bozeman, MT Rubber Dam Supplier: YOOIL Engineering, Goyang City, South Korea Controls: Thousand Hills, Port Ludlow, WA

PROJECT CONSTRUCTION – EQUIPMENT Rubber Dam Single bladder/anchor system 30 year design life for rubber bladder 10 mm rubber, 3 mm EPDM outer cover Fins to deflect nappe Air Supply System Operating pressure: 1 – 1.5 psi Inflation time: 12 minutes 4” air supply line and 1” pressure sensing line Specific Components: Ring compressor Level pressure sensor and pressure transmitter Actuated butterfly valve

PROJECT CONSTRUCTION – EQUIPMENT Controls: Manual Water Level Control Level pressure sensor < 0.1 feet ± target water level, no correction > 0.1 feet ± target water level, adjust every 5 minutes > 0.3 feet ± target water level, adjust continuously Pressure Control Mechanical safety system

PROJECT CONSTRUCTION – EQUIPMENT

PROJECT CONSTRUCTION – EQUIPMENT

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PROJECT CONSTRUCTION

PROJECT CONSTRUCTION

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PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - COMPLETION

PROJECT CONSTRUCTION - CHALLENGES Dewatering Subgrade Downstream sill Air line routing Second pressure sensing line

PROJECT OPERATION Operation Power Outages Winter Future Simple operation Radial gate operated regularly Power Outages Control panel reverts to manual mode Winter Managing ice Future Install UPS and incorporate telemetry

PROJECT TAKEAWAYS Importance of As-Built Drawings Defining tolerances for maintaining water elevation Air line routing Power source Contractor experience

PROJECT DESIGN – REFERENCES Design Standards No. 3 – Canals and Related Structures, Bureau of Reclamation Design of Small Dams, Bureau of Reclamation FlowMaster, V8i, Bentley HEC-RAS, US Army Corps of Engineers Water Measurement with Flumes and Weirs, ILRI Publication 58 Ramp flumes: http://www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/chap08_08 .html