Laserfiche WebLink
2015 URBAN WATER MANAGEMENT PLAN <br />loss volume is beneath the technically achievable minimum, which is possible but unlikely. This requires <br />further field investigation of leakage if leakage detection and control practices are not extensively <br />implemented and /or, given the Data Validity Score for some components in the Audit, further <br />investigation /confirmation of entries such as water supplied /accuracy of supply meters, accuracy of <br />customer meters, systematic data handling errors, and applicability of the default percentages applied in <br />the audit. <br />Apparent losses make up a significant portion of the City's total water loss at 80 percent; most of this was <br />developed from default percentages provided by the AWWA Water Audit. Based on this information, the <br />City can improve water loss by taking a closer look at apparent losses and developing a strategy to better <br />quantify this data in the future. The overall Water Audit score can also be improved by meeting the <br />standards AWWA has developed for each data point through clear City procedures and reliable data. <br />The result of the AWWA Water Audit completed for the City as required by the 2015 UWMP is <br />summarized in Table 2 -4. The water loss summary was calculated over a one -year period from available <br />data and the methodology explained above. <br />Table 2 -3: Water Loss Audit Summary (AF) <br />+' <br />Demand projections were developed by MWDOC for each agency within the Regional Alliance based on <br />available data as well as land use, population and economic growth. Three trajectories were developed <br />representing three levels of conservation: 1) continued with existing levels of conservation (lowest <br />conservation), 2) addition of future passive measures and active measures (baseline conservation), and <br />3) aggressive turf removal program - 20 percent removal by 2040 (aggressive conservation). The <br />baseline demand projection was selected for the 2015 UW MP. The baseline scenario assumes the <br />implementation of future passive measures affecting new developments, including the Model Water <br />Efficient Landscape, plumbing code efficiencies for toilets, and expected plumbing code for high - <br />efficiency clothes washers. It also assumes the implementation of future active measures, assuming the <br />implementation of Metropolitan incentive programs at historical annual levels seen in Orange County. <br />2.4.1 Demand Projection Methodology <br />The water demand projections were an outcome of the Orange County (OC) Reliability Study led by <br />MWDOC where demand projections were divided into three regions within Orange County: Brea /La <br />Habra, OC Basin, and South County. The demand projections were obtained based on multiplying a unit <br />water use factor and a demographic factor for three water use sectors, including single - family and multi- <br />family residential (in gallons per day per household), and non - residential (in gallons per day per <br />employee). The unit water use factors were based on the survey of Orange County water agencies (FY <br />arcadis.com 5 c' m 2 -6 <br />