The city of Fort Worth is in the fourth year of a multi-year program with the goal of inspecting all of its large-diameter sanitary sewer lines, grading their condition in order to schedule needed repairs and rehabilitation, and addressing the most critical needs first. (A separate program addresses smaller-diameter pipes.)
The Fort Worth Interceptor Condition Assessment Program (ICAP) was initiated in 2010 with a goal of inspecting 100 percent of pipe 24 inches and larger over a seven-year period, pending available funding. “At the end of 2014, inspection of 147 miles of pipe had been completed or approximately 60 percent,” said Darrell Gadberry, Fort Worth Water Department (FWWD) field operations division regulatory and environmental coordinator.
“The ICAP program,” Gadberry explained, “allows the FWWD to identify locations of probable failure and replace or rehabilitate the pipe before failure occurs. The cost to replace or rehabilitate a large diameter pipe before it collapses is a fraction of the cost to address pipe failure after it occurs. Eliminating overflows before they occur, avoiding catastrophic environmental impacts and keeping our large diameter interceptors at their peak designed performance and structurally sound makes ICAP an extremely cost-effective program.”
ICAP has three phases:
• Inspection of pipe;
• Pipe cleaning as necessary; and
• Managing the program.
Pipe inspection typically is made with CCTV equipment, usually after the pipe has been cleaned based upon the premise that it is easier to identify defects in a cleaned pipe. ICAP in Fort Worth significantly differs from this approach as inspections are made prior to cleaning and FWWD uses sophisticated 3-D laser technology for the inspections.
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