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<br />281.8
<br />
<br />FIGURES
<br />
<br />I, Map showing location of Pueblo Reservoir in relation to the upper Arkansas River Basin and location
<br />of sampling sites on Pueblo Reservoir ""..".."""" .."""", ",.,..,..""""""..,.""",....""".,,'..,........ ,...."..',..""""".."..., 3
<br />2-7, Graphs showing:
<br />2. End-of-month contents of Pueblo Reservoir, 1974 through 1989....................................................".........,.. 5
<br />3, Monthly mean inflow and outflow for Pueblo Reservoir, 1985 through 1989.................................."........... 6
<br />4, Monthly temperature profiles for Pueblo Reservoir and initial routing of inflow in Pueblo Reservoir,
<br />December 1986 and March through October 1987 ....."................................................................................' 13
<br />5, Monthly specific-conductance profiles for Pueblo Reservoir, December 1986 and March through
<br />October 1987 ...','...',.....'"",'..,'..... .......", ........""'...'"'..'..'.,.','....."",.."""...."""""..""..,."'.....'""""",,,,,, ,.", 16
<br />6. Relation of residence time, outflow, and reservoir storage in Pueblo Reservoir ..,........................................ 18
<br />7. Minimum reservoir residence times using mean daily inflow and outflow specific conductance,
<br />1986 and 1987 ....."..." ..........,..."......,........................ ..... ......... ,....,.......""",......,....."""........'"",.........."",.... 19
<br />8. Boxplots of measurements of Secchi-disk depths and approximate depths of euphotic zone
<br />for Pueblo Reservoir, 1985 through 1989,...................................................................................",.......................... 20
<br />9, Graphs showing monthly turbidity-measurement profiles of Pueblo Reservoir, December 1986 and
<br />March through October 1987..." ................... ......................................,....."". ,....""",..,.....".'.................""" .........'" 22
<br />10. Graphs showing selected monthly dissolved-oxygen concentration and pH-measurement profiles of
<br />Pueblo Reservoir, March, June, August, and October 1987..................................................................................... 25
<br />11. Boxplot showing dissolved-inorganic nitrogen concentrations in Pueblo Reservoir near the reservoir
<br />surface and near the reservoir bottom, 1986 through 1989......................................................................................, 31
<br />12, Boxplot showing total phosphorus concentrations in Pueblo Reservoir near the reservoir surface and near
<br />the reservoir bottom, 1986 through ]989.."",.....""",....."."...,.."........,......,...........,.........."""",..."'.'.'"",,,.........,... 32
<br />13. Boxplot showing dissolved-orthophosphorus concentrations in Pueblo Reservoir near the reservoir surface
<br />and near the reservoir bottom, 1987 and 1989.......................................................................................................... 33
<br />14, Graphs showing spatial and temporal variations in concentrations of total-recoverable iron, manganese,
<br />and zinc in Pueblo Reservoir, December 1986 and June 1987.......,......................................................................,.. 39
<br />15-21. Boxplots showing:
<br />15. Total-organic-carbon concentrations in Pueblo Reservoir near the reservoir surface and near
<br />the reservoir bottom, 1985 through ]987 ........................................,........................,..,................................., 47
<br />16, Chlorophyll a concentrations in Pueblo Reservoir near the reservoir surface, 1985 through 1987.............. 51
<br />17, Phytoplankton density and biovolume in Pueblo Reservoir, 1985 through 1987............."........................... 53
<br />18, Major phytoplankton group densities and biovolumes in Pueblo Reservoir, winter 1986.....................,...... 54
<br />19. Major phytoplankton group densities and biovolumes in Pueblo Reservoir, spring 1986 and 1987............. 58
<br />20. Major phytoplankton group densities and biovolumes in Pueblo Reservoir, summer 1985 through 1987,.. 59
<br />21. Major phytoplankton group densities and biovolumes in Pueblo Reservoir, fall 1985 through 1987.........., 61
<br />
<br />TABLES
<br />
<br />I. Statistical summary of water-quality data for station 07097000, Arkansas River at Portland, 1986
<br />
<br />through 1989,.""""", ................ ........""'...,..",,, ......,.',.......".....,...".., ......,..."""""",'..".'", ................., ......"""",,'... 8
<br />2. Statistical summary of dissolved-solids and major-ion concentrations in Pueblo Reservoir,
<br />
<br />1986 through 1989..,...... ...............,...,.... ...........""",....'........,....."..,....",.."""..,...."",..,..,.."""... ,..,..'.....",.. ......,'.... 28
<br />3, Relations of dissolved-solids and major-ion concentrations to specific conductance in Pueblo Reservoir............., 29
<br />4, Results of Mann- Whitney test of seasonal differences between dissolved-solids concentrations
<br />in Pueblo Reservoir, 1986 through 1989................................................................................................................... 29
<br />5, Estimated loads of total nitrogen and total phosphorus in Pueblo Reservoir inflow and outflow,
<br />1986 and 1987,....,...,..... ........."""",.."......"....'.'", .......""".,....'..'"", ,..'..',.....".......'"..........",.",....,..".."""" .........,. 33
<br />6, Concentrations of biologically available nitrogen and phosphorus and N:P values for Pueblo Reservoir,
<br />
<br />] 987 and 1989""... ,........."..". ..........""",.."""" ......'",'..,..."... ,.",..,....",..",."..""",.....".".... ......,....""""",.."""", ,.. 34
<br />7. Statistical summary of total.recoverable and dissolved trace-element concentrations in Pueblo Reservoir,
<br />
<br />1986 through 1989"""" ............,.",...,....",.." ,..""",'....'...".",..,..""",....""".."",..""""""..,....."., ,....'""""""""".... 36
<br />8. A comparison of seasonal and spatial differences in trace-element concentrations in Pueblo Reservoir,
<br />
<br />] 986 through 1989.... ....."""""", ............,,,'.....,,,...,..,,,,'.....,.,, ".",.."....", ,."",....."""...",.,."""", ,.".".",."",,"'.'...'" 40
<br />
<br />IV CONTENTS
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