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<br />. <br /> <br />( <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />I <br />. <br /> <br />/ <br />, <br /> <br />. <br /> <br />SWDED-XW <br />SUBJECT: <br /> <br />(SWAED-P 21 Oct 77) 1st Ind <br />Fountain Dam and Reservoir, Fountain Creek, Colorado, Design <br />Memorandum No.1, Hydrology - Part I <br /> <br />DA, Southwestern Division, Corps of Engineers, Main Tower Building, <br />1200 Main Street, Dallas, TX 75202 I 30~" <br /> <br />TO: District Engineer, Albuquerque, ATTN: SWAED-P <br /> <br />1. The hydrologic data are approved for use in future studies, subject <br />to the following comments. . <br /> <br />2. The duration of the volume frequency curve as explained in para 28 <br />should be presented. The rationale of the applicability of this curve <br />for all range of frequencies should be discussed. It.is noted that the <br />duration of the 100-year flood should be longer than the more frequent <br />floods. <br /> <br />3. Para 33 and 34. The critical centering of each standard project <br />storm for the Arkansas River along with rainfall and flood hydro graphs <br />should be shown on appropriate plates. <br /> <br />4. Para 39. It should be noted that the volume of the standard project <br />flood (flood control storage), as presented in this report (plate 16), is <br />128,000 acre-feet. <br /> <br />5. Additional investigations should be conducted and results presented <br />in the Part II Hydrology Memorandum to describe the quality of the water <br />anticipated in the lake and that to be discharged. More testing of high <br />flows will be necessary. The conclusions mentioned in the report that <br />the contamination by certain parameters is greater for the higher flows <br />should be verified by including discharge weighted values including antic- <br />ipated flows. The questions still left unanswered by the report, i.e., <br />the sources and quantities of the total dissolved solids, coli forms , nutri- <br />ents, and mercury and their effect on the degree of recreation usage should <br />be answered. Additional data necessary for design of the outlet works for <br />quality control and to meet state standards should be obtained. This addi- <br />tional information is considered essential for project formulation and <br />preparation of the EIS. <br /> <br />2 <br />