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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 />The objective of this section of feasibility analysis is to outline the basis <br />for se1 ecti ng monthly, 1 O-day, and daily peaki ng factors and to convert thel'l <br />into a range of design flow rates. High design flow rates could result in <br />spendi ng project funds for excess capaci ty that is not requi red unti 1 some <br />time in the distant future, thus diminishing funds available for Towaoc <br />municipal improvements. On the other hand, low design flows coulr! create <br />future situations with restrictive peaking capability. <br /> <br />If the pipeline must change from carrying a treated supply to raw water in the <br />future, it must be considered as a design factor now. If raw water is <br />conveyer!, termi nal storage tanks wi 11 still be needed to ho1 d treated water <br />reserves, and new storage such as a surface reservoir or a lined, coverer! <br />reservoi r woul d be needed for raw water storage. Such storage woul d reduce <br />peaking requirements on the pipeline and safely allow a lower design flow to <br />meet all the project needs. <br /> <br />Chapter 2.0 presented projecti ons of popu1 ati ons and future muni cipal use <br />based on a one-or two-percent annual popu1 ati on growth rate and a per capi ta <br />use rate of 200 gpcd. If the 1,000 af allocation is used strictly for <br />municipal consumption, Figure 2.2 indicates the water demand would not fully <br />utilize the supply for between 60 and 120 years. <br /> <br />The first basis examined for a design flow determination is therefore based on <br />the assumption that treater! water will be conveyed and will be used strictly <br />for muni ci pal expansi on. In additi on, it is assumed that only a mi nor storage <br />capaci ty above fi re-fl ow storage is avail abl e. Appropri ate peaki ng factors <br />for that case then need to be selecterl. <br /> <br />t~onthly flow records from 1963 through 1980 for the Ci ty of Cortez were <br />evaluated for use in estimating the monthly peaking factor. The Bureau user! <br />1963 to 1974 Cortez records for thi s purpose. Recent conversations with the <br />Cortez Water Department indicate there were probl ems with system 1 eakage and <br />meteri ng pri or to ahout 1972. Therefore, in thi s analysi s, we have used the <br />1973 to 1980 records. The average monthly peaking factor was determined by <br />finding the ratio of the maximum month delivery to the annual total divided by <br /> <br />3-5 <br /> <br />l060c <br />