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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 />~~rc <br />4~J~ <br /> <br />bottom ranged from less than 0.11 to 0.53 mg/L, and had an average concen- <br />tration of about 0.3 mg/L. Goldman and Horne (1983) indicate that total- <br />inorganic-nitrogen concentrations less than 0.1 mg/L may limit phytoplankton <br />growth, whereas concentrations greater than 0.4 mg/L would not limit growth. <br />A comparison of total-inorganic nitrogen and dissolved-inorganic-nitrogen <br />concentrations (fig. 16) indicate that nearly all the total-inorganic nitrogen <br />is dissolved. <br /> <br />Areal and vertical variations of mInImum and maximum total-inorganic- <br />nitrogen and dissolved-inorganic-nitrogen concentrations during the summer of <br />1985 in Pueblo Reservoir are shown in figure 16. The inorganic-nitrogen con- <br />centrations of samples collected near the reservoir surface varied more than <br />inorganic-nitrogen concentrations of samples collected near the reservoir <br />bottom. The minimum concentrations of inorganic nitrogen measured near the <br />reservoir surface were less than the minimum inorganic-nitrogen concentrations <br />measured near the reservoir bottom, probably as the result of biological <br />uptake in the euphotic zone. <br /> <br />Total-phosphorus and dissolved-phosphorus concentrations in Pueblo Reser- <br />voir during the summer of 1985 also are shown in figure 16. Total-phosphorus <br />concentrations ranged from less than 0.01 to 0.05 mg/L, with an average of <br />about 0.02 mg/L near the reservoir surface, and ranged from less than 0.01 to <br />0.22 mg/L, with an average of about 0.07 mg/L near the reservoir bottom. The <br />largest total-phosphorus concentrations measured at each transect occurred <br />near the reservoir bottom, possibly as a result of phosphorus associated with <br />underflow of Arkansas River water or from settling of dead algal cells. <br />Dissolved-phosphorus concentrations ranged from less than 0.01 to 0.02 mg/L <br />near the reservoir surface; the dissolved-phosphorus concentrations ranged <br />from less than 0.01 to 0.03 mg/L near the reservoir bottom, indicating that <br />the particulate phosphorus concentrations in Pueblo Reservoir are much greater <br />than soluble-phosphorus concentrations. Particulate phosphorus in a lake <br />includes bacterial, plant, and animal phosphorus as well as the phosphorus <br />adsorbed to the suspended sediment. Phytoplankton only are able to use phos- <br />phorus in the phosphate form for growth (Goldman and Horne, 1983). The ortho- <br />phosphate in the euphotic zone was rapidly consumed by phytoplankton, as <br />indicated by concentrations that generally were less than the analytical <br />detection level (0.01 mg/L). The total-orthophosphate concentrations near the <br />reservoir bottom were considerably greater than near the reservoir surface and <br />ranged from less than 0.01 to 0.06 mg/L near the reservoir bottom because of <br />the lack of biological uptake. <br /> <br />Major Chemical Constituents <br /> <br />The major chemical constituents are calcium, magnesium, potassium, <br />sodium, bicarbonate, carbonate, chloride, fluoride, and sulfate. These con- <br />stituents are used by plants as nutrients, but unlike nitrogen and phosphorus, <br />the concentrations usually are sufficient enough not to become limiting to <br />plant growth. Concentrations of major chemical constituents are affected by <br />the minerals and the solubility of the minerals in rocks that occur in the <br />drainage basin upstream from the reservoir, irrigation-return flows, waste <br />materials discharged to the Arkansas River upstream from the reservoir, <br />precipitation, and evaporation. <br /> <br />36 <br />
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