Agenda Information Sheet
DEPARTMENT: Utility Administration
CM/ ACM: Howard Martin
Date: August 9, 2016
SUBJECT
Title
Receive a report on use of innovative technology for operation and maintenance of the wastewater collection system.
Body
BACKGROUND
The Wastewater Collections department uses closed circuit TV inspection (CCTV) to investigate the condition of the existing sewer lines to make decisions on whether to use point repairs (removal and replacement of a bad section of the existing sewer line) or totally replace an existing sewer line. CCTV is very time consuming and expensive, but the most reliable means of making these sewer line rehabilitation decisions.
There are 522 miles of existing sewer lines in the collection system. When placed end to end the sewer line will extend from Denton to north of Kansas City. Not all sewer lines need to be CCTVed as they may have been recently constructed and/or have not exhibited maintenance issues. But which lines should be CCTVed? To help answer that question and make the best use of operations dollars the Collections department uses several computer models for sewer system asset management as listed below;
? ESRI GIS
? Cityworks CMMS
? WERF SCRAPS Model
? InfoWorks Sewer Model
? InfoMaster Sewer Model
Using these models a priority ranking of all the sewer lines was developed and then a CCTV priority ranking was established. This allowed spreading out of the CCTV effort over many years based on the priority ranking of the sewer lines.
However, in July of 2014, EPA established several requirements that the Denton Collection department has to meet. One of these requirements is the CCTV of 100% of the clay pipe sewer lines in the collection system by the end of 2015. This requirement using the regular CCTV equipment could not be met unless the city hired several CCTV contractors at great cost to do this work. The Collections department made the decision to use a flushing truck nozzle mounted camera to CCT...
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