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Last modified
1/26/2010 2:56:55 PM
Creation date
10/12/2006 4:04:11 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8449.700
Description
Cherry Creek
State
CO
Basin
South Platte
Date
9/1/1995
Author
Halepaska & Assoc.
Title
Phase 1 Baseline Water Quality Data Collection Study for the Upper Cherry Creek Basin - Final Report
Water Supply Pro - Doc Type
Publication
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />JCHA <br /> <br />SeDtember 1995 <br /> <br />FiDaI Reoort. Phase I .,....... Water 0uaIitv 0'" CoDoc:tioa SbIdv <br /> <br />DISCUSSION OF STUDY RESULTS <br /> <br />The principal focus of the first year of the Phase I baseline water quality data coIlection study <br />of the upper Cherry Creek Basin has been to evaluate concentrations and loadings of nitrogen <br />and phosphorus species to Cherry Creek Reservoir and to evaluate the general source of these <br />loads, i.e. point vs. non-point. <br /> <br />Figure II shows the cumulative daily loading rates for nitrate-nitrogen, total phosphorus and <br />soluble reactive phosphorus, as weIl as the cumulative annual load, at each of the stations in the <br />study reach. The data shown in Figure 11 are combined for the surface water and the ground <br />water stations at that location. As Figure 11 shows, there are several changes in the overall <br />nitrate-nitrogen and phosphorus loading throughout the study reach, rather than a continually- <br />increasing load due to inputs in the study reach. This may indicate uptake of these nutrients, <br />either by adsorption mechanisms or through utilization by phreatophytes. <br /> <br />The temporal loading of nitrate-nitrogen and phosphorus to Cherry Creek Reservoir is shown <br />in Figure 12. Phosphorus loadings from the period August 1994 through March 1995 were <br />relatively constant, at less than 10 lbs/day, however, there were increases in the phosphorus <br />loading during the spring of 1995 which were associated with the high runoff period. These <br />load increases were caused by increases in flow, while phosphorus concentrations generally <br />decreased during this period. <br /> <br />Nitrate-nitrogen loadings to the reservoir were relatively constant for the period August 1994 <br />through February 1995, with a generally increasing load through the Spring 1995 season, related <br />to the increase in flow caused by the wet spring weather. These nitrate-nitrogen loadings <br />resulted in a cumulative nitrate-nitrogen load input to Cherry Creek Reservoir from the Cherry <br />Creek mainstem of 23,575 lbs. for the period August 1994 through July 1995 (Figure 14). <br /> <br />-13- <br />
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