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108 <br />WATER RATE STUDY I City of Santa Ana, CA <br />• Cohort 0, Very Low PoF Score: All other pipe materials and installation years <br />Note: The City has structural concerns with a high pressure 36" MWD transmission line. Therefore it <br />was specifically assigned a high Cohort PoF score. <br />Figure B - 23 shows these Cohorts, grouped by breaks per 100 miles per year, and they range from an <br />average of 0.7 breaks per hundred miles per year in Cohort 0 to more than 9.5 breaks per hundred miles <br />per year in Cohort 5. Again, this can be compared to a national average of 12 -14 breaks per 100 miles <br />per year. <br />Based on the Cohort groups as described above, more than 95 percent of the water distribution mains <br />were in Cohort groups 0, 1, 2 and 3 as shown in Figure B - 24. Figure B - 24 provides a map of water <br />mains color coded by Cohort Rank. The Cohort Rank results were included as 60 percent of the initial <br />PoF Score. <br />Figure B - 23: Breaks per 100 miles per Year by Cohort Group <br />65B -120 <br />NOVEMBER 2014 <br />