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<br />'} .'~ ~~ :) <br />t'~ ,.' ..~ \.J <br /> <br />CONTENTS <br /> <br />Abslrocl .......................................................................................... ...................... ............................................. .................... I <br />Introduclion........,.....................................................................,................................................................. ...... __.................... 2 <br />Purpose and scope................................... ..................,.................................................................... ............................. 5 <br />Description of salinity-control projects...............................................,..........................................,............. ......................... 5 <br />Grond VaHey Unit............................. ..................... ..................... .................................................... .......... ...........,...... 5 <br />Lower Gunnison Basi n U nil............................................................................................,.................. ........................ 6 <br />Meeker Dome Unit..................................................................................__.................................. ................................. 6 <br />Dissolved-solids loads in lhe Colorodo and Gunnison Rivers.............................................................................................. 7 <br /> <br />Melhod of computalion .......... ...........................",...................................................,.... .........................................,..... 7 <br />Annual dissol ved-solids loads...........,....................,... ................................................,.....................................,.......... 8 <br />Melhods of trend analysis......................................,......,........................ ................................. ....................................... ....... 10 <br />Monotonic trend analysis using the seasonal Kendalllesl.........__............................................................__................. JO <br />Monotonic trend anal ysi 5 usi ng linear regression...................... _......... .......... ......................... _.......... ......................... 12 <br />Step-lrend analysis.........................................................,........................................... ..................... ............................ 13 <br />Trend analysis for the Colorodo and Gunnison Rivers ......................................................................................................... 13 <br />Trends in dissolved-sol ids concentrations............ _......... '..........'................... '........,.................................. .................. 14 <br />Trends in dissolved-solids loads ..............................................................., ,............................................ ........" ,.......... 16 <br />Monlhl y dissol ved-sol ids loads,............ ....... ........ ..........................................................,..,............................... 17 <br />Annual dissol ved-solids loads......................,... ...................... ...........................,............................................... 18 <br />Seasonal dissol ved-solids loads ............ ....................................."................................................................ ..... 18 <br />Grand Valley dissolved-solids load............................................................................................................,...... 20 <br />Trends in selected major-ion concentrations............................................................................................................... 21 <br />Relation of trend results for the Colorado and Gunnison Rivers fa the salinity-control projects............................... 29 <br />Trend analysis for the White River ..,........................................__.......................................................................................... 31 <br />Summary................ __......................... ........................................... ........................ ....... .............................. ............................ 36 <br />References ciled .................... ................................................................. ....................................................................__.......... 37 <br /> <br />FIGURES <br /> <br />I. Map showing location of the Grand VaHey, the Gunnison River Basin. and selecled gaging slalions ................. 3 <br />2. Map showing location of the White River Basin and selected gaging stations in the vicinily of <br />Meeker Dome ..............................__....,........,.....................,.................................................................................... 4 <br />3-12. Graphs showing: <br />3. Annual mean slream discharge for gaging stalions 09095500 Colorado River near Cameo. <br />09152500 Gunnison River near Grand Junction. and 09163500 Colorado River near the <br />Colorado-Utah Stale line, water years 1970-93 ......................................................................................... JO <br />4. LOWESS smoolh curves of flow-adjusted dissolved-solids concenlrotions for stalions 09095500 <br />Colorado River near Cameo. 09152500 Gunnison River near Grand Junction. and 09163500 <br />Colorodo River near the Colorado-Utah State line. water years 1970-93............................................ 16 <br />5. LOWESS smooth curves of flow-adjusled dissolved-solids concentralions for stations 09095500 <br />Colorado River near Cameo, 09152500 Gunnison River near Grand Junction. and 09163500 <br />Colorado River near the Colorodo-Ulah Slate line, water years 1980-93................................................. 17 <br />6. LOWESS smooth curves of unadjusled monthly dissolved-solids loads and flow-adjusled monthly <br />dissolved-solids loads for sIal ions 09095500 Colorado River near Cameo, 09152500 Gunnison <br />River near Grand Junction. and 09163500 Colorado River near the Colorodo-Utah Slate line. <br /> <br />water years 1970-93...............................,..... .__............................................................................................ 19 <br /> <br />eONTENTS III <br /> <br />)." <br />