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<br />0:1515 <br /> <br />. <br /> <br />probable impact on many aspects of water chemistry, there are some <br /> <br />general reactions that can be expected. The reservoir will act <br /> <br />to equalize or smooth out variations in the chemical and/or physical <br /> <br />content of incoming flows. Turbid flows will be detained and clarified <br /> <br />through settling, resulting in a higher quality-use resource. Impound- <br />ments often act to concentrate nutrients, including residues although, <br /> <br />detention duration and storage volumes significantly influence this <br /> <br />aspect of water quality. Generally, it is anticipated that discharged <br />water will be slightly higher in nutrient or residue content. Water <br />quality data (Appendix C) give Some indication that the numbers of <br />coliform bacteria in the Purgatoire River above Trinidad are higher <br />than allowable standards for body contact sports. Impoundments often <br /> <br />act as bacteriological filters, concentrating bacteria of potential <br /> <br />public health danger in a localized area until numbers are naturally <br />reduced, rendering water discharged from the depths of the lake <br />virtually free of potentially harmful organisms. While numbers of <br />coliforms should be lessened in the lake through natural limiting <br />factors, the source(s) of these contaminants should be controlled <br />to avoid any potential health hazards. Specific source points are <br />not known, although animal waste (difficult to control) and the <br />presence of small, scattered areas of human habitation and visitation <br />along the river suggest potential sources. <br />Water released from the reservoir should receive increased <br />aeration both from the outlet works and in the reach below the dam <br />and will be of suitable quality for a diversity of uses. A substantial <br /> <br />. <br /> <br />IV-17 <br />