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The City's total potable water use is not constant over the year but varies in a monthly pattern <br />which is characteristic of municipal water systems. Water use is highest from late spring through <br />summer and early fall reflecting demands associated with landscaping and other outdoor uses. <br />During the winter months (November through March) the monthly use averages approximately 5 <br />percent of the total annual use. <br />City of Boulder <br />Water User Patterns <br />Outdoor <br />34 <br />Indoor <br />66 <br />City of Boulder <br />Water Use by Customer Category <br />Unaccounted Municipal Commercial/ <br />8.5% 3.2°/ Industrial <br />26.4 <br />Single-Family <br />Residential °' <br />34.2 % _ <br />Muni-Family <br />Residential <br />27.7 <br />Source: WBLA, 1988 <br />Consumptive Ilse <br />Only a portion of the treated water used by the City of Boulder for municipal purposes is <br />consumed; the remainder is returned to Boulder Creek. The consumptive use of all in-house <br />potable uses is estimated at 5% of the in-house diversion based on treatment at a centralized <br />sewage facility. <br />Monthly depletion and return flow factors for Boulder's municipal water use during the irrigation <br />season were determined in Case No. 90CW 193 and are shown in Table 7, expressed as monthly <br />percentages of municipal diversions. For the City's accounting purposes, the unconsumed portion <br />of Boulder's municipal water use (both indoor and outdoor) returning at or above the 75th Street <br />wastewater treatment plant is determined by multiplying the daily municipal delivery by the return <br />flow factor for the relevant month as shown in Table 7 (consumption is estimated at 5% for non- <br />irrigation season months). <br />Table 7 <br />City of Boulder Municipal Consumptive Use Percentages for Irrigation Season <br />Month Consumptive <br />Use <br />A r 21% <br />May 3 9% <br />Jun 48% <br />Jul 53% <br />Au 48% <br />Se 34% <br />Oct 17% <br />City of Boulder Memo.Doc Page 22 of 30 March 9, 2005 <br />