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Bonytail chub .................................. 51 Razorback sucker ............................... 51 Fiow-temperature Relationships ......................... 51 • Velocity .......................................... 52 Vegetation ........................................ 52 ENVIRONMENTAL CONDITIONS ........................... 54 Climate .. .......... ............................. 54 Area ............................................ 57 HYDROLOGIC CONDITIONS .............................. 58 Basinwide Conditions ................................ 58 Upper Colorado River Mainstem ........................ 60 Green River ....................................... 64 San Juan River ..................................... 66 White River ....................................... 67 Yampa River ...................................... 68 EXISTING AND PROPOSED WATER DEVELOPMENT PROJECTS ... 70 HYDROLOGY MODELS .................................. 73 Basinwide Models .................................. 73 Models Applied Locally ............................... 78 DISCHARGE DATA COLLECTION SITES ..................... 80 CHAPTER FOUR: CHANNEL MAINTENANCE AND FLUSHING FLOWS .. 83 CHANNEL MAINTENANCE ............................... 83 Channel Equilibrium ................................. 83 Colorado River .................................. 84 • Green River .................................... 84 White River .................................... 87 Yampa River ................................... 87 Cross Mountain Project ........................... 91 Site Stability Evaluations .............................. 92 SEDIMENT PRODUCTION ................................ 95 Upper Colorado River Basin ........................... 95 Green River Basin .................................. 95 Yampa River Basin ......... ..... ............... 101 Little Snake River Basin .............................. 105 SEDIMENT TRANSPORT MODELING ....................... 108 Green River ...................................... 108 Yampa River ..................................... 110 Little Snake River .................................. 112 HABITAT RELATIONSHIPS .............................. 112 SPECIES-SEDIMENT TRANSPORT ......................... 114 Turbidity ........................................ 114 Spawning ....................................... 114 FLUSHING FLOWS .................................... 116 Substrate Requirments ............................ 116 Colorado squawlish ............................. 116 0