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City of Santa Ana, CA I WATER RATE STUDY <br />Figure B - 9: Water Mains by Mipe Diameter and material <br />Water Main Break Statistics <br />Water Break Data <br />According to the City's GIS database, there are almost 400 break (Leak) records added to the database <br />since 1990. These records are tied to a street address or street intersection only. Therefore, no direct <br />reference to specific water facilities is provided. To identify which pipe segment the break occurred on, <br />a GIS -based spatial analysis was performed. This process identified the closest water pipe to each break <br />symbol. The distance between the break and pipe was also measured. If this distance was minimal, it <br />was considered a valid match. Validation checks were also used to identify match success based on pipe <br />and break record attributes. However, many break record attributes were missing or likely inaccurate. <br />For example, for some records the pipe material listed for the broken pipe was more likely the material <br />used in the repair. Therefore, many break records could not be used in the pipe condition analysis. In <br />total 290 main line breaks were usable, over the period of 1990 to 3/2012. Of these, 12 breaks were on <br />abandoned pipes. Note, slight variations in break totals are listed in the following sections due to <br />availability of source data attributes. <br />The relatively small sample size limits the statistical significance of the analysis and trending that can be <br />undertaken using these data. However, general trends and problem areas can still be identified. These <br />results and assumptions should be revisited over time to further refine and validate the conclusions. <br />This will require a condition assessment plan to be put in place which involves the targeting and <br />collection of condition data at specific locations and within particular 'cohorts' of interest as well as <br />opportunistic collection and analysis of samples of failed pipe collected both during operational <br />incidents and proactive pipe rehabilitation /replacement activities. Changes in the data attributes to be <br />collected are also recommended. <br />BLACK & VEATCH I Appendix 8: water CIP Prioritia?t'.:;, rr-=e;-. 89 <br />65B -101 <br />