Laserfiche WebLink
one very significant response as discussed below. Also during these drought times, municipalities cannot rely on <br />native South Platte flows developed under junior water rights (i.e., junior to the PRRIP baseline of July 1, 1997). <br />Municipalities have junior water rights but they cannot rely on them for firm constant annual yields to meet <br />increased water demands. For firm yields, municipalities rely on the other sources and hope that their junior water <br />rights will yield some storable water once in awhile. The analysis of the water yields of junior South Platte water <br />rights is discussed below. <br />Water Conservation <br />The CWCB SWSI Water Demand Forecast Technical Memorandum 2.3 discusses in detail water conservation <br />efforts and provides levels of water demand by county for the year 2000. Information from the SWSI report for the <br />South Platte counties was used to quantify 2000 M &I water conservation efforts in the South Platte Basin. SWSI <br />2000 information is a good average for the initial period of 1998 -2002. This SWSI report also provided information <br />on self - supplied (SS) water deliveries, which was used to increase the M &I water deliveries (ac- ft/person) <br />determined from the questionnaires. <br />The SWSI report lists the 2000 level of water conservation by county as a level 1, 2 or 3. Each level is an increase <br />in water conservation activities such as metering, education, landscape audits /xeriscaping and rate structures. The <br />SWSI report states that the reduction in water demand for level 1 is 2.5 %, level 2 is 5% and level 3 is 7.5 %. Table <br />2A columns F and G are a summary by county of 2000 water conservation activities and this table in the right most <br />column I shows a computation in overall M &I water savings in 2000 of 0.0182 ac -ft per person per year along with <br />a listing of savings by CPFD region of North, Central or South. These values by region are used in Table I for the <br />initial CPFD period of 1998 -2002 by multiplying these values by region population from the questionnaire to <br />determine acre -feet of water conservation by region. <br />The computation for additional M &I water conservation savings between the initial period of 1998 -2002 and the <br />recent/current 2004 -2008 period is done by taking a difference between the acre -feet per person by region for each <br />of these periods listed in Table IA Column E. This difference is shown in Table 2B in the right most column for <br />overall (0.0241 ac -ft per person) and by region. <br />The total M &I water conservation amount for the recent/current period is the water conservation for the initial <br />period plus the additional water conservation occurring between the initial period and current for a total of 0.0423 <br />ac -ft per person overall (0.0182 + 0.0241). These summations by region are used in Table IA for the current period <br />of 2004 -2008 by multiplying them by region population from the questionnaire to determine acre -feet of water <br />conservation by region. <br />Revised Gross per Capita Water Requirement (ac -ft per person per year) <br />The CPFD analysis utilizes gross acre -feet per person per year multiplied by the total population growth by region <br />since July 1, 1997 to determine the total amount of water deliveries in a year. Table 2B lists the questionnaire <br />results of 0.223 ac -ft per person per year as the annual M &I deliveries overall combining regions for the <br />recent/current 2004 -2008 period. Of interesting note, the 0.0423 ac -ft per person total savings from M &I water <br />conservation is 19% of the total M &I deliveries (0.0423 / 0.223). <br />To determine the total gross ac -ft per person, the M &I deliveries must be adjusted upwards to account for the <br />deliveries from self - supplied (SS) entities. The SWSI report tabulates for 2000 by county the M &I water demand <br />and the SS water demand separately. For the counties of the South Platte Basin, the SWSI report indicates for 2000 <br />as shown in Table 2A column D that the SS water demand is 12.1% of the M &I water demand. Therefore the M &I <br />demand for current 2004 -2008 period will be increased by 12.1 %. Increasing the overall M &I demand for current <br />2008 of 0.223 ac- ft/person/year by 12.1 % gives a total demand of 0.2504 ac- ft/person/year as shown in Table 2B. <br />The original CPFD value for total gross per capita water requirement was 0.27. The reduction to 0.2504 is the result <br />of the increased water conservation. <br />The 0.2504 ac- ft/person /year gross per capita water requirements is the value used in the CPFD <br />accretion /depletion analysis for the first 2 -year reporting period of 2007 -2008 and for the next 5 -year <br />reporting period of 2009 -2013. <br />