North Platte River Basin Water Resources Planning Model User’s Manual October 2012 Table of Contents 1. Introduction .................................................................................................................................... 1-1 1.1 Background .................................................................................................................................. 1-1 1.2 Development of the North Platte River Basin Water Resources Planning Model ...................... 1-1 1.3 Results .......................................................................................................................................... 1-2 1.4 Future Enhancements ................................................................................................................... 1-2 1.5 Acknowledgements ...................................................................................................................... 1-2 2. What’s in This Document .............................................................................................................. 2-1 2.1 Scope of this Manual ................................................................................................................... 2-1 2.2 Manual Contents .......................................................................................................................... 2-1 2.3 What’s in other CDSS documentation ......................................................................................... 2-2 3. The North Platte River Basin ........................................................................................................ 3-1 3.1 Physical Geography ..................................................................................................................... 3-1 3.2 Human and Economic Factors ..................................................................................................... 3-3 3.3 Water Resources Development .................................................................................................... 3-3 3.4 Water Rights Administration and Operations .............................................................................. 3-3 3.5 Section 3 References .................................................................................................................... 3-4 4. Modeling Approach ....................................................................................................................... 4-1 4.1 Modeling Objectives .................................................................................................................... 4-1 4.2 Model coverage and extent .......................................................................................................... 4-1 4.2.1. Network Diagram................................................................................................................. 4-1 4.2.2. Diversion Structures ............................................................................................................ 4-4 4.2.3. Reservoirs ............................................................................................................................ 4-8 4.2.4. Instream Flow Structures ..................................................................................................... 4-9 4.3 Modeling Period......................................................................................................................... 4-10 4.4 Data Filling ................................................................................................................................ 4-10 4.4.1. Historical Data Review ...................................................................................................... 4-10 4.4.2. Automated Time Series Filling ........................................................................................... 4-10 4.4.3. Natural Flow Filling .......................................................................................................... 4-11 4.5 Consumptive Use and Return Flow Amounts ........................................................................... 4-13 4.5.1. Variable Efficiency of Irrigation Use ................................................................................ 4-13 4.5.2. Constant Efficiency for Other Uses and Special Cases ..................................................... 4-15 4.6 Disposition of Return Flows ...................................................................................................... 4-16 4.6.1. Return Flow Timing ........................................................................................................... 4-16 4.6.2. Return Flow Locations ....................................................................................................... 4-16 4.7 Natural Flow Estimation ............................................................................................................ 4-17 4.7.1. Natural Flow Computations At Gages ............................................................................... 4-17 4.7.2. Natural Flow Filling .......................................................................................................... 4-17 4.7.3. Distribution Of Natural Flow To Ungaged Points ............................................................ 4-18 4.8 Calibration Approach ................................................................................................................. 4-20 4.8.1. First Step Calibration ........................................................................................................ 4-20 4.8.2. Second Step Calibration .................................................................................................... 4-20 Table of Contents i 4.9 Baseline Dataset ......................................................................................................................... 4-21 4.9.1. Calculated Irrigation Demand ........................................................................................... 4-21 4.9.2. Municipal and Industrial Demand ..................................................................................... 4-21 4.9.3. Transbasin Demand ........................................................................................................... 4-22 4.9.4. Reservoirs .......................................................................................................................... 4-22 5. Baseline Data Set ............................................................................................................................ 5-1 5.1 Response File (*.rsp) ................................................................................................................... 5-2 5.1.1. For Baseline Simulation ...................................................................................................... 5-2 5.1.2. For Generating Natural Flow .............................................................................................. 5-4 5.2 Control File (*.ctl) ....................................................................................................................... 5-4 5.3 River System Files ....................................................................................................................... 5-4 5.3.1. River Network File (*.rin).................................................................................................... 5-4 5.3.2. River Station File (*.ris) ...................................................................................................... 5-5 5.3.3. Natural Flow Parameter File (*.rib) ................................................................................... 5-5 5.3.4. Historical Streamflow File (*.rih) ....................................................................................... 5-6 5.3.5. Natural Flow Files (*.xbm).................................................................................................. 5-7 5.4 Diversion Files ............................................................................................................................. 5-8 5.4.1. Direct Diversion Station File (*.dds) ................................................................................... 5-8 5.4.2. Return Flow Delay Tables (*.dly) ...................................................................................... 5-23 5.4.3. Historical Diversion File (*.ddh) ...................................................................................... 5-24 5.4.4. Direct Diversion Demand File (*.ddm) ............................................................................. 5-25 5.4.5. Direct Diversion Right File (*.ddr) ................................................................................... 5-26 5.5 Irrigation Files ............................................................................................................................ 5-28 5.5.1. StateCU Structure File (*.str) ............................................................................................ 5-28 5.5.2. Irrigation Parameter Yearly (*.ipy) ................................................................................... 5-28 5.5.3. Irrigation Water Requirement File (*.ddc) ........................................................................ 5-28 5.6 Reservoir Files ........................................................................................................................... 5-28 5.6.1. Reservoir Station File (*.res)