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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 Inflowl 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 STILUNG BASIN DESIGN...... ..... ..................... ....... ..... ....... ............. ...... 4-12 EMERGENCY SPILLWAY DESIGN...... .............. ........ ...... ...... .................. 4-13 HYDROELECTRIC FACIUTY DESIGN. ............... ............ ......... ....... .........4-17 FISH EXCLUSION FACIUTIES ...............................................................4-17 DOWNSTREAM CHANNEL ST ABIUTY ...................................................4-20 CHAPTER.S - 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 I I I I I I I I I I I I I I I I I I I