This Is a Digital Document from the Collections of the Wyoming Water Resources Data System (WRDS) Library
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This is a digital document from the collections of the Wyoming Water Resources Data System (WRDS) Library. For additional information about this document and the document conversion process, please contact WRDS at [email protected] and include the phrase “Digital Documents” in your subject heading. To view other documents please visit the WRDS Library online at: http://library.wrds.uwyo.edu Mailing Address: Water Resources Data System University of Wyoming, Dept 3943 1000 E University Avenue Laramie, WY 82071 Physical Address: Wyoming Hall, Room 249 University of Wyoming Laramie, WY 82071 Phone: (307) 766-6651 Fax: (307) 766-3785 Funding for WRDS and the creation of this electronic document was provided by the Wyoming Water Development Commission (http://wwdc.state.wy.us) CODY-LAKEVIEW IRRIGATION EXCHANGE PROJECT - LEVEL n INVESTIGATION REPORT JANUARY 1986 ACKNOWLEDGEMENTS WYOMING WATER DEVELOPMENT COMMISSION James Noble, Chairman Walter Pilch J.W. Myers, Vice Chairman Willard Rhoads William Glanz, Secretary Mer I Rissler Myron Goodson Ka thleen Sun Nelson Wren, Jr. WYOMING WATER DEVELOPMENT COMMISSION STAFF Michael Purcell - Administrator Craig Goodwin - Project Manager LAKEVIEW IRRIGATION DISTRICT Bob Hicks, Manager Mick McCarty, Legal Counsel CODY CANAL mRIGATION DISTRICT Lee Ballinger, Manager C. Edward Webster, Secretary JAMES M. MONTGOMERY, CONSULTING ENGINEERS, INC. PROJECT STAFF Technical Advisory Committee John E. Somerville - Principle-in-Charge Kenneth G. Ferguson - Chairman Engineering Robert Jossis - Project Manager Dennis Suihkonen - Project Engineer Dan Wetstein Graphics Thomas Narad Leann Hays Report Production Diana Barnes Leslie Nelson Gayleene B. Duncan TABLE OF CONTENTS Page No. CHAPTER 1 - SUMMARY AND CONCLUSIONS Summary 1-1 Lakeview Consumptive Use and Irrigation Demand 1-1 Water Rights and Supply 1-1 Exchange Improvements 1-2 Cost Analysis 1-3 Conclusions 1-3 CHAPTER Z - INTRODUCTION Background 2-1 Authorization 2-1 Scope of Study 2-2 Abbreviations 2-3 CHAPTER 3 - LAKEVIEW CONSUMPTIVE USE AND mRIGATION DEMAND General 3-1 Acreage Irrigated and Crop Patterns 3-1 Historical Water Diversions 3-2 Efficiency of Use 3-2 CHAPTER 4 - WATER RIGHTS AND SUPPLY General 4-1 Water Rights 4-1 General 4-1 Lakeview Water Rights 4-2 Other Water Rights 4-2 Exchange Agreement 4-3 Exchange Effect on Other Water Users 4-3 Historical South Fork Shoshone River Flow 4-5 Estimated Lakeview Water Shortage 4-5 Estimated Available Supply at Lakeview Headgate 4-6 Water Quantity to be Exchanged 4-6 CHAPTER 5 - EXCHANGE IMPROVEMENTS General 5-1 Buffalo Bill Reservoir to Cody Canal Pipeline 5-1 i TABLE OF CONTENTS (continued) Page No. CHAPTER 5 - EXCHANGE IMPROVEMENTS (continued) Diversion and Delivery Points 5-1 Pipeline Capacity 5-1 Pipeline Route and Rights-of-Way 5-2 Soils and Geology 5-2 Hydraulics 5-3 Pipe Materials 5-4 Appurtenances 5-4 Hydraulic Analysis of Cody Canal 5-4 Flow Range 5-4 Existing Canal Characteristics and Appurtenances 5-5 Hydraulic Analysis 5-5 Improvements to Cody Canal 5-5 South Fork Shoshone River Ilnprovements 5-8 CHAPTER 6 - COST ANALYSIS General 6-1 Crop Value Analysis 6-1 Method of Calculation 6-1 Value and Yield per Acre 6-2 Water Supply Shortages 6-2 Crop Reductions 6-2 Exchange Improvement Costs 6-3 Capital Costs 6-3 Operation and Maintenance Costs 6-7 Benefit-to-Cost Ratio 6-7 Lakeview Irrigation District Upgrade Costs 6-9 CHAPTER 7 - PROJECT IMPLEMENTATION General 7-1 Lakeview Irrigation District Support 7-1 Project Funding 7-2 Wyoming Water Development Commission (WWDC) 7-2 Private Lending Institutions 7-2 Other Agencies 7-2 ii TABLE OF CONTENTS (continued) Page No. CHAPTER 7 - PROJECT IMPLEMENTATION (continued) Legal Requirements 7-3 Easement and Permit Acquisitions 7-3 Design and Construction 7-3 Schedule 7-4 Future Considerations 7-4 APPENDIX A Exchange Agreement APPENDIX B List of Water Rights APPENDIX C Resul ts of Survey APPENDIX D Agency Comments iii LIST OF TABLES Table No. Page No. 1-1 Exchange Ilnprovements Annualized Cost 1-3 3-1 Crops Patterns and Assumed Planting Dates 3-3 3-2 Calculated Lakeview Consumptive Use and Demand Neglecting Precipitation 3-4 3-3 Calculated Lakeview Irrigation Requirement and Demand Considering Precipitation 3-5 3-4 Range of Historical Lakeview Diversions 3-6 4-1 Lakeview Water Rights 4-2 4-2 Cody Canal Irrigation District Water Rights 4-3 5-1 Cody Canal Lateral Submergence Analysis 5-6 6-1 Assumed Crop Values and Yield 6-2 6-2 Value of Lakeview Irrigation District Production and Unrealized Potential Production 6-4 6-3 The Value of Increased Production in the Lakeview Irrigaiton District with an Enhanced Water Supply 6-5 6-4 Exchange Improvement Costs 6-6 6-5 Exchange Improvements Annualized Cost 6-8 6-6 Structural Replacements and Improvements - Construction Costs 6-10 LIST OF FIGURES Following Figure No. Page No. 2-1 Exchange Agreement Schematic 2-1 3-1 Range of Historical Lakeview Diversions 3-6 4-1 South Fork Shoshone River Hydrographs 4-5 4-2 Estimated Lakeview Shortage at Mean Supply Condition 4-5 4-3 Estimated Lakeview Shortage at 80% Supply Condition 4-5 4-4 Estimated Water Supply Available at Lakeview Canal Headgate 4-6 5-1 Conveyance Pipeline Plan and Profile 5-1 5-2 Energy Dissipation Structures 5-4 5-3 Cody Canal Facilities 5-5 5-4 Typical Cross Sections of Cody Canal 5-5 5-5 Typical Gate-Type Check Structure 5-8 5-6 South Fork Shoshone River Level Control Structures 5-8 7-1 Project Implementation Schedule 7-4 iv CHAPTER ~-JAMES M. MONTGOMERY. CONSULTING ENGINEERS. INC.----' CHAPTER 1 SUMMARY AND CONCLUSIONS SUMMARY The Lakeview Irrigation District {Lakeview} has proposed an exchange agreement with the downstream Cody Canal Irrigation District {Cody Canal} to receive up to 100 cfs and 10,000 acre-feet of water from the South Fork Shoshone River during water short years. The objective of this report is to evaluate the technical and economic feasibility of the exchange. Following is a brief summary of key elements addressed in this study. Lakeview Consumptive Use and Irrigation Demand • The Lakeview Irrigation District encompasses 9425 acres of which approximately 9167 acres are currently irrigated. The total irrigated acreage appears to be decreasing rather than increasing due to subdivi sion of larger ranches and farms into smaller 1 to 10 acre parcels. • Current irrigated acreage consists of 65.6% alfalfa, 20.9% pasture, 12.8 percent spring grain, and 0.7% corn and potatoes. Crop patterns are not anticipated to significantly change in the future. • The theoretically ideal irrigation demand for the crop pattern grown in 1983 was calculated to be 18,687 acre-feet. The average annual amount of water diverted by Lakeview from the South Fork Shoshone River from 1965 to 1983 was 57,884 acre-feet which is approximately 6.3 acre-feet per acre irrigated per year. Therefore, the overall average efficiency of the Lakeview system is estimated at approximately 32 percent. Generally older systems with unlined canals and mostly flood irrigation application such as practiced by Lakeview typically have efficiencies in the range of 30 to 40 percent. • The major losses of water for Lakeview appear to occur in the canal, which has an estimated conveyance efficiency of 60 to 65 percent. • It is estimated that the overall irrigation efficiency for the Lakeview system could be increased to greater than 50 percent by lining those sections of the canal exhibiting high losses, and conversion from flood irrigation to sprinkler irrigation systems in selected areas. Water Rights and Supply • In general, Wyoming water law is based on prior appropriation and allows surface water diversion of one cubic foot per second {cfs} per 70 acres irrigated. If sufficient supply exists, up to 2 cfs per 70 acres may be diverted. • Lakeview has a total recorded water right on the South Fork Shoshone River for 9335 acres and thus can divert 133.36 cfs per Wyoming water law. The majority of that right {122.15 cfs} is recorded prior to May 1-1 1903. Essentially all of the Lakeview water rights are entitled to divert up to an additional 1 cfs per 70 acres when surplus water is available. • The total recorded water right on the South Fork Shoshone River is approximately 380 cfs with the Cody Canal Irrigation District having a water right of approximately 180 cfs, most of which is recorded prior to April 1896. Essentially all of the Cody Canal water rights are entitled to divert up to an additional 1 cfs per 70 acres when surplus water is available. • An exchange agreement is possible between the Lakeview and Cody Canal Irrigation Districts to allow Lakeview to divert up to 100 cfs of direct flow and deliver a like amount of exchange water from Buffalo Bill Reservoir to Cody Canal. An exchange petition, accompanied by the signed exchange agreement, Inust be filed with the State Engineer requesting approval of the exchange. The exchange is also contingent on enlargement of the reservoir, which is currently in the initial stages of construction. • Lakeview appears to have daily shortages up to 50 cfs during the period of mid-July to mid-September in an average water supply year. It is estimated daily shortages up to approximately 95 cfs will occur during the saIne period approximately two years out of ten based on historical South Fork Shoshone basin runoff records. • Annual shortages are estimated at 4500 acre-feet during an average water supply year and up to 12,000 acre-feet two years out of ten. • It should be understood that in two years out of ten (or a statistical probability of occurrence of less than 0.2) the South Fork Shoshone River supply will be inadequate to meet Lakeview's total historical water requirement even with implelnentation of the exchange agree ment.