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<br />j: I <br />II <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />For those EI Paso County water providers whose build-out date occurs prior to: 2020, we have <br />maintained that date as the build-out date, but we carried the build-out date wa~er demand as a <br />constant demand to the year 2020. For those water providers whose build-out date is later than <br />I <br /> <br />2020 we assumed a linear rate of water demand increase from current demahd to build-out <br />, I <br />demand, and we calculated the year 2020 water demand from this linear relationship. <br />I <br /> <br />In some cases, the water providers provided a build-out date but no estimated d~mand at build- <br />out. For these cases, we estimated the year 2020 water demand from the historicl1 demand using <br />a linear relationship. Finally, for the estimated 25,000 people in EI Paso count~ currently using <br />their own wells, we estimated the year 2020 water demand by assuming no i increase in the <br />number of private well users in the County and. applying a per capita water detnand rate of 80 <br />gpcd. The estimated annual water demand for 2020 by water provid(~r, includinglthe private well <br />users, is shown in Table 1.1. I <br />I <br />I <br />I <br />Figure 1-2 shows the current annual water usage and year 2020 annual water demand for the EI <br />Paso County water providers, as well as the individual well users group. Becausb the CSU is the <br />largest current user (80 percent of current annual usage) and the largest projbcted year 2020 <br />water demand provider (82 percent of year 2020 annual water dem,md excludiJg the individual <br />well users), it was not included on Figure 1-2. It is interesting to note that indiJidual well users <br />I <br />have an annual water demand among the six highest projected for the year 2020 in EI Paso <br />~~. I <br /> <br />Based on the estimated annual water demands shown in Table 1.1, the countyfwide year 2020 <br />projected water demand is estimated to be approximately 163,300 al~-ft, compared to the current <br />I <br />annual water usage of approximately 89,600 ac-ft. The estimated increase in lEI Paso County <br />annual water demand is approximately 82 percent higher in year 2020 than th~ current annual <br />water usage. This year 2020 value includes the CSU. Without the CSU, the ~ear 2020 annual <br />water demand will be approximately 32,300 ac-ft with the individual well \lsers group and <br />I <br />30,000 ac-ft without the individual well users group (Table 1.2). 1 <br />I <br />I <br />I <br />The future year 2020 projected annual water demands will not occur uniformly bver the 20-year <br />I <br />planning horizon. Because some water providers will be built-out prior to 202<!> and others will <br />still be growing, we have estimated the cumulative annual water demand fro~ the year 2000 <br />I <br />through the year 2020 as shown in Table 1.2 and graphically on Figure 1-3. CJ;1anges in annual <br />I <br />water demand are non-linear, with larger increases for the first half of the planning horizon <br />I <br />compared to the second half of the planning horizon. The annual distribution ~f water over the <br /> <br />5 <br /> <br />WaterReport.doc <br /> <br />September 5, 2002 <br />