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<br />( <br /> <br />( <br /> <br />4.0 <br /> <br />5.0 <br /> <br />( <br /> <br />0015:..6 <br /> <br />TABLE OF CONTENTS <br /> <br />Paae <br /> <br />1.0 EXE CUTIVE SUMMARy.................. ............... ................................... ......... ...... ............. 1 <br /> <br /> <br />2.0 PROJECT DESCRIPTION AND PURPOSE ................................................................ 7 <br />2.1 Project Location and Description.. ............................ ............. ........... ............ ...... ......... ........ 7 <br /> <br />2.2 Project Purpose.... ... ... ...... .......... ......... ....... ........ ......... ....................... .... .................. .... .......8 <br /> <br />2.3 Study Objective... ............................ ....................... ...................................................... ........ 9 <br /> <br />3.0 DESIG N DATA............ ............. .................................. .............. ....~.......;. ............ .......... 11 <br /> <br />3.1 Topography and Feasibility Level Study Drawings .................................:..........................11 <br /> <br />3.2 Reservoir Inflow........... ...... .......... .... ........................ .......... .................. .............. ...... ..... .....12 <br /> <br />3.2.1 Water Rights ....................... ..... .......................................................................... 12 <br /> <br />3.2.2 Surface Water.................................................................................................... 12 <br />3.2.3 Groundwater Recharge................... .......... ......... ...... ................ ..... ..... .... ............14 <br />3.3 Dam Hazard and Size Classification .................................................................................15 <br /> <br />3.4 Hydrology.... ....................................................................................................................... 16 <br /> <br />3.4.1 Background ................... ........................ ........................................................ .....16 <br />3.4.2 Probable Maximum Precipitation .....:............. ................. ..... .... ..........................16 <br />3.4.3 Unit Hydrographs .................. ........................................................................ .....17 <br />3.4.4 HEC-1 Rainfall Runoff Simulations ....................................................................19 <br />3.5 Outlet Operating Criteria...... ......................... ......... ... ..... ....... .................................... ..... ....21 <br /> <br />3.6 Engineering Geology... ........... .... .................. ....... .... .......... ................. ............ ... .... ...... ......21 <br />3.7 Geotechnical Investigation. .............. ........................... .............................. ..... .....~.. ............22 <br /> <br />I NSTITUTIONAL ASPECTS......................................................................................... 28 <br />4.1 National Environment Protection Act ............. ........... ............ ............... ..................... .........28 <br />4.2 Threatened and Endangered Species .................................... ....... .... .......................... ......28 <br />4.2.1 Federally Listed Species Considered and Evaluated.........................................28 <br /> <br />4.2.2 Sensitive Species............................................................................................... 30 <br />4.2.3 San Juan River Basin Recovery Implementation Plan.......................................31 <br />4.2.4 Summary of Conclusions of Threatened and Endangered Species Evaluation 31 <br /> <br />4.3 Wetlands.......................................................................... ................................................ ..32 <br /> <br />4.3.1 Direct Impacts ........ ....... ................. ..... ....... .......................... ............... ..... .......... 32 <br />4.3.2 Preliminary Wetlands Mitigation Plan........................... .................. ........ ............33 <br /> <br />4.3.3 Permitting........................................................................................................... 33 <br /> <br />4.4 Cultural Resources............................................................................................................ 34 <br />4.5 Local Consultations... .......... ............... .............. ............ ........ .... ............ ............. ......... .......35 <br />4.6 Indian Trust Assets.. .......... ............. ..... .......... .......... ............. ................... ....... ............ .......36 <br />4.7 Findings of Regulatory and Institutional Investigations.............................................. ........37 <br /> <br />DAM AND APPURTENANT STRUCTURES .............................................................. 38 <br /> <br />5.1 Introduction ...... ........ ......... ............ ..... ........... ........ ............... ..................... .............. ........... 38 <br /> <br />5.2 Reservoir ................ ......... .... .......... .................. ...... .............. ...... ............................. ...........39 <br /> <br />5.3 Spillway................. ........ ... ... .... ........ ................ ..... ............ .... ...... ..... ............... .......... ..........40 <br /> <br />5.3.1 Spillway Type ........... ..... ............. ....... .......... ............ ...................................... .....40 <br /> <br />5.3.2 Spillway Flow. ...... ..... .... .......... ........ ...... ...... ............ ..... .... .... ........ ..... .... ... ... ........41 <br />5.3.3 Hydraulic Control Sections ............. ............ ........................ ................ ..... ....... ....42 <br /> <br />5.4 Dam... .......... .......... ...................... ....... ............ ..................... ................ .............. ....... ..... ....43 <br />5.4.1 Embankment Section ......... .... ......... ....... ........ ................. .................... ......... ......43 <br />5.4.2 Minimum Freeboard.. ............ ....................... ....... .......... ........................... ..........44 <br />5.4.3 Seepage Control Measures ....... ..... ....... ........... ..... ......... ................... ............. ...45 <br /> <br />5.4.4 Earthwork .... ....... ...... ...... .......... .... ....... ........ ................. ...................... .......... ......45 <br />