MSD Pipe Rating Program AQUA SALUBRIS

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MSD Pipe Rating ProgramAQUA SALUBRIS
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Pipe Rating Program

• What is it?
• A new, proactive program used to define and
  develop rehabilitation projects.
• The usual reactive approach is to rehabilitate
  an entire line after significant problems have
  occurred.

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Pipe Rating Program

• Purpose To get the Biggest (and Quickest) Bang
  for the Buck. This method should prove quicker
  and more efficient than our Basin Rehabilitation
  Projects.
• Focuses Rehabilitation Dollars where they are
  most needed whether at a single point repair or
  a traditional DR project.

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Pipe Rating Program

• Brief History
• Over the past 10 years MSD has had an aggressive
  rehabilitation program, having funded over 111
  million since FY93, primarily through traditional
  approaches.
• Pipe Rating was developed as a progression of our
  Basin Rehabilitation and Preventative Maintenance
  Programs. To date MSD has completed the first
  London Road Pilot Basin project _at_ 23,000 LF
  and is 71 finished with our second basin
  project, Tomahawk Basin _at_ 49,000 LF. The total
  cost will be about 6.5 million.
• Each of these basin-wide projects was divided
  into three phases for speed
• 1) Lining on both private property and public
  R/W
• 2) DR in public R/W and
• 3) DR on private property

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Pipe Rating Program

• Brief History (Contd)
• Basin-Wide Rehabilitation, though comprehensive,
  is both time-and-capital intensive, taking 3-5
  years to develop and complete a project. With
  sixty-nine sub-basins within the District, this
  approach is too slow.
• Seeking higher levels of efficiency, MSD
  developed a program which targets hot-spots. This
  program also dovetails with our new State
  Collection System Permit (at the time only the
  fourth such permit in the State).
• MSD is now required to rehabilitate at least
  50,000 LF per year. In prior years we have
  exceeded over 90,000 LF, though this is being
  ramped down over time.

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Pipe Rating Program

• How was it started?
• A special group was formulated which was
  comprised of several levels of staff including
  GIS, System Services, engineering, and
  management.
• This Vertical Team helped to garner support
  from all levels within MSD and to gather as
  diverse an input as possible.

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Pipe Rating Program

• Elements Used
• 1) CCTV information
• 2) Defect Scoring System
• 3) GIS Database Software
• 4) Sanitary Sewer Overflow (SSO) history
• 5) Engineering analysis
• These components are combined to generate
  specific projects for problem lines.

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Pipe Rating Program

• How Does the Process Work?
• 1) A line segment is first cleaned and CCTVd, as
  a part of MSDs Preventative Maintenance Program.
  MSD is required to clean 10 of our system each
  year, in accordance with our new collection
  system permit.
• MSD has CCTVd over 32 basins
  totaling
• 2,073,030 LF ( 43 of our total
  system
• _at_ 900 miles) as of June 2003.
• 2) Each structural defect noted in the video
  inspection is given a
• defect score, in accordance with MSDs
  standardized scoring
• system. Defects are then embedded within the
  GIS database,
• with appropriate scores attached.

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• HAND-OUT

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• MSD Structural Defect Scores
• Code Description Score
• CC Circumferential Crack 20
• CL Longitudinal Crack 20
• CM Multiple Cracks 30
• COH Corrosion Heavy 50
• COL Corrosion Light 20
• COM Corrosion Medium 30
• D Deformed Sewer 65
• FC Circumferential Fracture 40
• FL Longitudinal Fracture 40
• FM Multiple Fractures 60
• HL Hole Large 50
• HP Hole Patched 5
• HS Hole Small 25
• JDL Joint Displaced Large 30

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Pipe Rating Program

• How Does the Process Work? (contd)
• 3) Upon quantifying all structural defects within
  a pipe segment, three defect ratings are
  generated in our GIS
• I) Peak Defect Rating
• II) Mean Defect Rating
• III) Mean Pipeline Rating
• Also, a fourth component is added for prior
  overflow history
• IV) SSO Rating

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• HAND-OUT

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Pipe Rating Program

• Then What?
• This pipe rating is then used to flag the
  worst-of-the-worst pipes within a rated basin.
  As the rating is done via the GIS database, it
  occurs quickly.
• Once flagged, an engineer will further review
  CCTV footage of the segment, then evaluate
  rehabilitation options for the highest (meaning
  worst) rated pipes, by reviewing videos of each
  flagged segment then determining the most
  economical rehabilitation methods.
• All CCTV information is stored digitally and can
  be quickly retrieved for further analysis. An
  additional benefit of this format is that
  maintenance personnel can also quickly review
  CCTV information as needed.

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• HAND-OUT

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Map Showing Peak Defect Rating
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Map Showing Mean Defect Rating
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Map Showing Mean Pipeline Rating
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Projects for FY04

• In the first year of this program, MSD has added
  five pipe-rated projects to the FY04 CIP
• Four are Point Repair type projects, while one
  is a traditional DR due to the number of severe
  defects in several segments. Total estimated cost
  is 273,250.
• This program is organic and will re-prioritize
  over time as new data is received and other pipes
  are rated. There has been a good correlation
  between pipes with high ratings and real-time
  maintenance problems.
• To Date, over 737,536 LF of sewer has been rated
  by this program. Approx. 276,849 LF have been
  added to MSDs 10 year CIP.

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In May of 2003, MSD received an AMSA National
Environmental Achievement Award for the Pipe
Rating Program. This program was developed solely
with MSD in-house staff and off-the-shelf
software. MSD and Los Angeles were the only two
utilities in the nation to receive this award.
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MSD Pipe Rating ProgramAQUA SALUBRIS