Asset Management and
Sewer Engineering Using GIS Integrated
with Document Management in San Francisco
Greg Braswell -
Bijoy Nair -
City & County of San Francisco,
Bureau of Engineering
Asset Management and
Sewer Basemap Project Report
•Background/History of Sewer Mapping/Engineering in San Francisco
•Data Requirements, Problems and Solutions
•As-Built Viewer
•Conversion Methods and Processes
•Current Status and Future Plans
March 8, 2002
City & County of San Francisco BOE
- ValueCAD
Owns and Operates the Water Distribution
Network And San Francisco’s Sewer System
Bureau Of
Responsible for maintaining information
about City of San Francisco Sewer System
History of SF Sewers
• “900” miles of sewer
• Combined system
• Started in 1850’s
• Approx 15% older then
100 years
• Many large, complicated
structures that have been
modified many tims
• Many Non-typical
History of Sewer Mapping
•Typical Paper Mapping System
•All Information Lost in 1906 Fire
•1909-1934 Inspection Books
•1934-1940 WPA effort
•Section Maps
•Map Books (Atlas)
•Different versions with different Man Hole Numbers
•1989 Earthquake
•First Electronic Version
•14 separate ACAD files
•1994 Sink Hole
•Field data collection and corrected approx 200 blocks
•North Beach Area
•Marked on aerial photos
To Access Sewer Information
Hydraulics Section Has Used :
Section Maps of City
5x8 Index Cards Organized by Street
City of San Francisco Engineering Drawings on Aperature Cards
Street Inspection Reports, on Aperature Cards and paper
Many different types of additional Drawings on paper
City Wide Basemap by
• Creation of CCSF Basemap (1993-5)
– Aerial Photos
– Parcels
– Features
– Street Centerlines
– Major portion of funding from Clean Water
ValueCAD’s First Sewer
Basemap Efforts
• Updating Sewer Basemap (1998-Present)
– Combine previous ACAD files
– Reference to City Basemap
• (NAD83CaStPlIII)
Rubbersheet to correct location
Add attributes in object data to pipes from annotation
Renumber Manholes
Processes automated to reduce cost
Decision Time
• Sewer Basemap Obviously Lacked a large number of manholes
– “Schematic map” not useful for asset mgmt.
• Basic attributes incomplete or outdated
– Material – Size - Date
• No Hydraulic modeling information
– Rim
– Invert
• Investigate GPS – Survey
– $$$$$$$$$$$
– Pipes the priority
• AsBuilts?
– 50 engineeering Drawings tested
– $$$$$
On Site Investigation
• Contractor to sit and work with Hydraulic Staff to:
– Evaluate alternatives for sewer basemap data collection and conversion
– Work with city staff, evaluate processes and business needs
• Document Management
– Not as easy as city staff thought
– Engineering AsBuilts represent less then 15% of possible data
– Wide variety of document types with different data value
• Evaluate Variety of Needs
– Engineers view Vs. Citywide view
• Develop Possible Uses and Prototypes
• Set Goals and Standards for GIS efforts
• “Balkanized” City Departments
Goals for Sewer GIS Basemap Project
Cost effectiveness – relative return on investment
• Document Management $$
• Engineering Decision Support $$$
– Provide engineers with efficient access to all available information, not
replace good engineering… METADATA – engineer understands the value
and completeness of the information to make the best engineering decisions
• Hydraulic Modeling – Master Planning $$
• Asset Management - $$$$$$
– Public decision making
– Cost effectiveness of engineering and maintenance decision
– Management of maintenance efforts
• Integrate Asset Management with Engineering Process $
• Information Organized in one place for various agencies $$
• Emergency Response/ Environmental/ Waste Management
Goals for Data Collection and
• Efficiency
– Speed
– Accuracy
Multiple Uses of Data Collected
Sustainable Pace and Budget
“Do-able” – Reasonable Expectations
Exception Process
All Sewer related drawings have been collected
and Scanned
Drawings Were Indexed by Street
New sewer GIS map and sewer information have
been developed block by block using the original
Pipes, manholes and structure information
collected have been automatically linked to as built
drawings or best available documents.
To Access the Scanned Drawings
Hydraulics Developed and is Using the
As Built Viewer
Hydraulics Has Been Able to Link To the
Index Cards
Index Cards had been transferred to Excel Spreadsheet called SMS Index
SMS Index turned into Access Database table and cleaned up
Drawings that the SMS Index referenced were picked first to be scanned
Links made between scanned drawings and SMS Index
Links made between SMS and Centerline file
Spatial Join between Streets and Pipes to put SMS information onto pipes
So Now We can Look Up
Pipe Information and drawings by Street
We can use the Viewer to Insert the
Drawings Into AutoCAD
2. Select corresponding
1.Select a point on the Image
point in AutoCAD
3. Select 2nd point
4. Select 2nd point
on image
Indexing By Street Allows
Finding Files By Location
• Enter Street and Cross Streets
Get List of Files for Those Blocks
All Files Are Linked To
CCSF Basemap
Street Centerline network
• Linked To Blocks and Intersections
By “CNN”
• Allows look up for cross street
ValueCAD Data Conversion Process
Divide into subsections based on Drainage basins
Use asbuilt viewer to select correct document
Enter correct location of pipes and manholes
Add pipe and manholes if required
Enter additional attribute data
Automatic link of data collected to documents
Exception Handling to increase efficiency and accuracy
Automated using AutoCAD vba
Current Efforts and Future Directions
– Spring-Summer 2003
– Large Pipes and Structures
– Automated QA/QC
– Exceptions
• Automation of CAD to integrate Engineering Design
and Maintenance of Asset Management Database Oracle
• Integrate with Sewer TV Tape, Inspections, Asset
• Major Structures – East Side
• Web based applications
Current Efforts and Future Directions
Spring-Summer 2003
• Catch Basins – ArcPad
• Storm Water Discharge Permits
• Integrate AWSS
Bureau Of
Thank You