Post on 19-Dec-2015
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Identifying Critical Sewer Lines
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Project Definition
Identify Critical Sewer Lines in College Station– Necessary Step by Utilities Mngr– $3 million budget
• $1.9M Treatment• $1.1M Collection
Research CS Preventative Maintenance Capabilities & Strategies
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Sewer Maintenance
Historical Perspective– Reactionary vs. Proactive Strategies
Cost Effectiveness– Material Type– Life Cycle Costs
College Station– $3M Sanitation Budget, $1.1M for O&M of
sewer collection system
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Preventative Maintenance
Types of Preventative Maintenance– Mechanical Sealing– External Grouting– Root Removal– Cleaning: Jet Rodding– Biological Agents: De-Greaser Bugs
College Station’s Tools– Jet Rodding, Bugs, TV equipment
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Categories of Sewers
Category A– High Impact System on
surrounding environment– Post-failure Rehab is
twice as expensive as planned replacement/four times cost of scheduled rehab
– Require preventative maintenance
Category B– Less critical than A
because of reduced failure cost and effect.
– Preventative action is still cost effective
Category C– Non-critical Sewers– Preemptive Work in
these sewers would not be cost effective
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Sewer Characteristics
Old Age Deeper than
average Clay pipes Located under busy
streets Difficult access
Located in Poor Soil Conditions
Difficult to bypass Require Frequent
Inspection or maintenance
Near sensitive environmental area
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Sewer Lines in College Stations
Large Lines – 13” or greater Busy Street – Texas Ave Require Frequent Maintenance
– Vitrified Clay Pipe– Tree roots and grease
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Original Sewer Lines ThemeSewer lines range from 4” to 32”.
There is over 1.2 billion liner feet of sewer lines.
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Sewer Line Attribute TableLENGTH MAINSIZE DIA_FT MATERIAL MTR_CODE96.75355 6 0.50 VCP 6
294.09395 8 0.67 VCP 6324.90152 8 0.67 VCP 6161.64467 8 0.67 VCP 6931.82030 15 1.25 VCP 6485.49871 8 0.67 VCP 6447.62065 8 0.67 VCP 6337.35006 18 1.50 VCP 6208.00240 18 1.50 VCP 6299.79420 6 0.50 VCP 6257.57717 6 0.50 VCP 6258.94015 6 0.50 VCP 6340.38884 6 0.50 VCP 6313.46700 6 0.50 VCP 688.28927 6 0.50 VCP 6
433.87736 6 0.50 VCP 6
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Sewer Lines - 1
Large sewer lines account for 1/8 of the network and include 215,000 liner feet of sewer lines.
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Sewers Lines - 2
Texas Ave is the primary road through College Station and Bryan.
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Sewer Lines - 2
The resulting Arcview Query identified only 14 of 4600 sewer segments that intersected Texas Ave. 6 of the 14 lines were larger than 13”.
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Critical Lines - 3
6” – 8” clay lines account for nearly 1/2 of the entire line segments and over 500,000 liner foot of sewer lines.
April 10, 2002 Jon Kreischer CVEN 689 - GIS
The Project Continues
Working with Manholes– Manhole Point Theme– Network Analysis
Conclusions
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Sanitation Work Force
Preventative Maintenance
Locating the Manholes
April 10, 2002 Jon Kreischer CVEN 689 - GIS
Any Questions