2. PRESENTATION OVERVIEW
Background
Design
Construction
Operation
Takeaways
Questions

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

4. PROJECT BACKGROUND

5. 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

6. 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

7. PROJECT DESIGN – EXISTING CONDITIONS

8. PROJECT DESIGN – EXISTING CONDITIONS

9. Mean Monthly Flows (CFS)
PROJECT DESIGN – EXISTING CONDITIONS
Little Bighorn River:
Monthly Mean Flows
USGS Station
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

10. 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

11. 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

12. 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

13. 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:

14. PROJECT DESIGN – RUBBER DAM vs. OBERMEYER GATE

15. 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

16. PROJECT DESIGN – RUBBER DAM
PROJECT DESIGN – RUBBER DAM

17. PROJECT DESIGN – OBERMEYER GATE

18. 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

19. 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)

20. PROJECT DESIGN – DIVERSION DAM & HEADWORKS

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

22. 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

23. 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

24. PROJECT CONSTRUCTION – EQUIPMENT

25. PROJECT CONSTRUCTION – EQUIPMENT

26. PROJECT CONSTRUCTION

27. PROJECT CONSTRUCTION

28. PROJECT CONSTRUCTION

29. PROJECT CONSTRUCTION

30. PROJECT CONSTRUCTION

31. PROJECT CONSTRUCTION

32. PROJECT CONSTRUCTION

33. PROJECT CONSTRUCTION

34. PROJECT CONSTRUCTION

35. PROJECT CONSTRUCTION

36. PROJECT CONSTRUCTION

37. PROJECT CONSTRUCTION

38. PROJECT CONSTRUCTION - COMPLETION

39. PROJECT CONSTRUCTION - COMPLETION

40. PROJECT CONSTRUCTION - COMPLETION

41. PROJECT CONSTRUCTION - COMPLETION

42. PROJECT CONSTRUCTION - COMPLETION

43. PROJECT CONSTRUCTION - COMPLETION

44. PROJECT CONSTRUCTION - COMPLETION

45. PROJECT CONSTRUCTION - COMPLETION

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

47. 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

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

49. 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: .html