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<br />iii <br /> <br />Contents <br /> <br />Abstra cl.......... ............................................ .......... .......................... ................ .................................................1 <br />Introduction.....................................................................................................................................................1 <br />Pu rpose and S co pe ............ .......................... ............ .......... .............. .............................. ........ ..............3 <br />Description of Study Area ..... .............. .......... .............. .............. .................. ....... ... .................... ..........3 <br /> <br />Ac knowledgments .......................................................... ...................... ............................................ ....4 <br />Methods for Loss and Gain Investigations................................................................................................4 <br />Field Reconna issanc e.. ............ .... ................................................ .................. .................... ...... ............4 <br />Discharge Measurements........... ........................ ............................................................ ............... .....4 <br />Loss and Gain Computations ............................................................................................................10 <br />1 Canal Losses and Gains..............................................................................................................................10 <br />Picketwire (Baca Joint) Canal..........................................................................................................1 0 <br /> <br />EI Moro Canal...... ...................... .............. .......... .......................................................... .............. ..........16 <br />Chilili Canal............................................................................................................. ..............................16 <br />Enla rg ed Southside Ca nal..... .......... ............................ .... ................ ........................ .............. ...... ......23 <br />Model Inlet and Outlet Canals ..........................................................................................................23 <br /> <br />John Flood CanaL....................................................... .......................... ...... ............ .................... ........33 <br /> <br />Hoehne Ca nal ................ ............ .......>0..... ...... .... ........ ...... .................................. .......... ........................33 <br />Comparison of Flume-Rated and Measured Discharges at Canal Headgates..................................39 <br />Factors Affecting Canal Losses and Gains and Changes in Headgate Stage-Discharge <br />Relations ............... ...... ................ .......... .......... ........................................................................ .........46 <br /> <br />Summary........................................................................................................................................................47 <br />Referenc es Cited.... ............................ ................................ .......................... ........................ ................ ........48 <br />Appendix........................................................................................................................................................49 <br /> <br />Figures <br /> <br />1. Map showing location of study area and selected Purgatoire River Water <br />Conservancy District Canals near Trinidad, Colorado............................................................2 <br /> <br />2.. Photograph showing water-stage recorder and Parshall flume at measurement <br />site HOHG (Hoehne Canal headgatel........................................................................................9 <br /> <br />3. Photograph showing splitter box located at measurement site S507 on the <br />Enl a rg ed Southside Ca na I ......... .................. ............................ ................... ........... .............. ........9 <br /> <br />4. Map showing location of measurement sites along Picketwire Canal (Baca Joint <br /> <br />Ca nail. ................ ...... ............ .... .......... .......... .............. .............. .......................... .... .............. ...... ...12 <br />5. Graphs showing losses and gains in (A) cubic feet per second and (8) percentage <br />of subreach inflow in selected subreaches of the Picketwire Canal................................15 <br /> <br />6. Map showing location of measurement sites along EI Mora Canal..................................17 <br /> <br />7. Graphs showing losses and gains in (AI cubic feet per second and (81 percentage <br />of subreach inflow in selected subreaches of the EI Moro Canal.....................................19 <br /> <br />8. Map showing location of measurement sites along Chilili Canal.......................................21 <br /> <br />9. Graphs showing losses and gains in (AI cubic feet per second and (8) percentage <br />of subreach inflow in selected subreaches of the Chilili CanaL........................................22 <br /> <br />10. Map showing location of measurement sites along Enlarged Southside Canal.............24 <br />