Laserfiche WebLink
it <br />WATER RATE STUDY I City of Santa Ana, CA <br />Number of Breaks per Mile by Decade Pipe Installed and Material <br />To better understand the trends in break history, one must also consider the growth of the system over <br />time - not just the distribution of breaks. Table B - 5 and Figure B- 15 below charts the number of total <br />breaks per mile by decade pipe was installed and by material. These graphics show that almost 68 <br />percent of the breaks have occurred in Cast Iron pipe, 19 percent in Asbestos Cement and 7 percent in <br />Ductile Iron. Also, 58 percent of the breaks have occurred in pipe installed in the 1950 -6Os. However, <br />only 43 percent of all pipes were installed during these two decades. <br />The GIS break records do not include any indication of the causes of breaks. City staff has indicated that <br />most breaks are not due to third -party (excavation) causes. Therefore, it is concluded that the breaks <br />are predominantly caused by material deterioration, defects, and /or construction methods. <br />Table B - 5: Number of Breaks per Mile by Decade Pipe Installed and Material <br />Decade <br />AC <br />CI <br />CMLC <br />CYL <br />DI <br />PVC <br />STL <br />UNK,"�' <br />bfitjXtl. <br />1930 Pre <br />0.00 <br />1.51 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />1.50 <br />1930s <br />2.66 <br />1.44 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />1.60 <br />1940s <br />0.00 <br />1.24 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />1.20 <br />1950s <br />0.64 <br />1.08 <br />0.00 <br />0.23 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.93 <br />1960s <br />0.34 <br />0.85 <br />0.00 <br />0.07 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.66 <br />1970s <br />0.25 <br />0.76 <br />0.00 <br />1.18 <br />1.30 <br />0.00 <br />0.00 <br />0.00 <br />0.29 <br />1980s <br />0.24 <br />0.00 <br />0.00 <br />0.00 <br />2.35 <br />1.83 <br />0.00 <br />0.00 <br />0.50 <br />1990s <br />0.00 <br />0.00 <br />0.57 <br />0.00 <br />0.05 <br />0.14 <br />0.00 <br />0.00 <br />0.12 <br />2000s <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.03 <br />0.00 <br />0.00 <br />0.03 <br />2010s <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />Total 0:30. - 1.01 0.41 0.12 0.62 0.20 0.00 0.00 0.57 <br />Figure B -15: Number of Breaks per Mile by Decade Pipe Installed and Material <br />65B -108 <br />NOVEMBER 2014 <br />