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WSP04550
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Last modified
1/26/2010 12:56:01 PM
Creation date
10/12/2006 12:25:48 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8146.400
Description
Pueblo Dam - Reports
State
CO
Basin
Arkansas
Water Division
2
Date
1/1/1986
Author
US Geological Survey
Title
Reconnaissance of Water Quality of Pueblo Reservoir Colorado--May Through December 1985
Water Supply Pro - Doc Type
Report/Study
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<br />.'"'.~ .~ - <br />(1985). ~~~Lhe exception of the nitrogen and phosphorus species, water <br />samples analyzed by the U.S. Geological Survey Denver Central Laboratory were <br />collected as part of the quality-assurance program. These samples were <br />collected during July, August, and September near the reservoir bottom at <br />transect 2 and near the reservoir surface at transect 7. Additional samples <br />collected from the other transects were submitted to a cooperator laboratory <br />for chemical analyses. However, these data were not included in tile report <br />because samples analyzed as part of the quality-assurance program in 1985 <br />indicated these data did not meet quality-assurance criteria. <br /> <br />Biological samples were collected for analysis of phytoplankton and <br />zooplankton. Biological analyses were done by Chadwick and Associatesl of <br />Littleton, Colo. Phytoplankton samples were collected from a single depth <br />near the reservoir surface using a 4-L, nonmetallic, 2-ft-Iong water-sampling <br />bottle. Samples were preserved using a 37-percent formaldehyde solution. <br />Prior to counting, the phytoplankton sample was thoroughly mixed by vigorous <br />shaking; an aliquot was immediately withdrawn with a clean pipette and trans- <br />ferred to a settling chamber. Algae were allowed to settle for 4 hours for <br />each 10 mL of height in the settling chamber. When buoyant organisms rose to <br />the top of the chamber, it was necessary to do a strip count at the top as <br />well as at the bottom of the chamber. If the sample contained such a great <br />density of algae that there were multiple layers on the bottom of the chamber, <br />or if silt covered and obscured the algae, a 10-mL aliquot that was diluted 5 <br />to 10 times was used for the count. If the sample contained very small den- <br />sities of algae, the algae were concentrated by allowing additional settling <br />time in order to decrease statistical error in counting. Phytoplankton counts <br />were made using a 200- to 1,000-power microscope (Chadwick and Associates, <br />Littleton, Colo., written commun., 1985). <br /> <br />Zooplankton samples were collected by lowering a 80-~m mesh zooplankton <br />net to within a few feet of the reservoir bottom and towing the net to the <br />reservoir surface at a rate of about 2.5 ft/s. The net was rinsed thoroughly, <br />and zooplankton were transferred to a bottle and preserved with ethyl alcohol. <br />Zooplankton samples were diluted in the laboratory to 40 mL in a small beaker <br />using a 63-~m mesh screen when necessary. The sample then was agitated, and a <br />l-mL aliquot was withdrawn and placed on a counting cell. The zooplankton <br />were counted in strips using a microscope at 100 power magnification (Chadwick <br />and Associates, Littleton, Colo., written commun., 1985). <br /> <br />DESCRIPTION OF DRAINAGE BASIN <br /> <br />Pueblo Reservoir drains an area of 4,669 mi2, of which 4,369 mi2 or <br />about 94 percent drains into the Arkansas River upstream from the reservoir <br />and about 300 mi2 or about 6 percent drains directly into the reservoir. <br />The upper Arkansas River basin (fig. 1) is a high-elevation, semiarid basin <br />that extends from Leadville to Pueblo (a straight-line distance of 120 mil <br />and includes all of Lake, Chaffee, Fremont, and Custer Counties, and parts <br />of Saguache, Park, Teller, EI Paso, and Pueblo Counties (pl. I). The basin <br />is bordered by the Sangre de Cristo, Sawatch, and Mosquito Mountain Ranges. <br /> <br />IThe use of firm names in this report is for identification purposes only <br />and does not constitute endorsement by the U.S. Geological Survey. <br /> <br />5 <br />
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