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Current Potential Conditions Scenario ....................................................... 2-12 2040 Demand Conditions without Elkhead Enlargement Project ....................... 2-16 2040 Demand Condition with Enlargement Project ....................................... 2-18 CHAPTER 3 - RESERVOIR SITE CHARACTERIZATION LAND USE AND OWNERSHIP .............................................. :.................. 3-1 General Physiographic Setting .................................................................. 3-1 Historical Land Development and Existing Land Use ..................................... 3-1 Future Land Use .................................................................................. 3-3 Property Ownership .............................................................................. 3-3 GEOTECHNICAL INVESTIGATIONS ........................................................ 3-6 Previous Investigations ........................................................................... 3-6 New Investigations ................................................................................ 3-6 Seismic Risk ....................................................................................... 3-8 MAPPING ............................................................................................. 3-8 OPERATIONAL AND FLOOD HYDROLOGY ............................................. 3-10 Background .......................................................................................3-10 Operational Hydrology .......................................................................... 3-10 Flood Hydrology ................................................................................. 3-11 SEDIMENT MOVEMENT ..................................................................... 3-15 General ............................................................................................. 3-15 Sediment Inflow/Accumulation ................................................................ 3-15 Downstream Channel Stability ................................................................ 3-16 CHAPTER 4 - PRELIMINARY DESIGN OF DAM AND SPILLWAYS DAM TYPE EVALUATION AND SELECTION ............................................ 4-1 DAM EMBANKMENT DESIGN ................................................................ 4-2 Recommended Design ........................................................................... 4-4 PRIMARY OUTLET DESIGN ................................................................... 4-6 SERVICE SPILLWAY DESIGN ................................................................. 4-8 STILLING BASIN DESIGN ......................................................................4-12 EMERGENCY SPILLWAY DESIGN ..........................................................4-13 HYDROELECTRIC FACILITY DESIGN .....................................................4-17 FISH EXCLUSION FACILITIES ............................................................... 4-17 DOWNSTREAM CHANNEL STABILITY ................................................... 4-20 CHAPTER 5 - DEVELOPMENT PLAN SUMMARY OF PROJECT FEATURES .......... ............................................. 5-1 REGULATORY AND PERMITTING REQUIREMENTS .................................. 5-1 Federal Agencies ........................ .......... ............................................. 5-2 State Agencies ........................................ ............................................. 5-5 Local Agencies ....................................... ................... ................... 5-6 ACQUISITIONS AND RELOCATIONS .......... ............................................. 5-6 Land Acquisitions .................................... ............................................. 5-6 Roads and Bridges ................................... ............................................. 5-8 Utilities ................................................. ..................... .................... 5-9 CONSTRUCTION PLAN ............................. ............................................. 5-9 Construction Methods .................. .......... ............................................. 5-9 ii