STORMWATER ASSET MANAGEMENT - Imagin...STORMWATER ASSET MANAGEMENT: THE ROLE OF GIS IN ASSET...
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STORMWATER ASSET MANAGEMENT:
THE ROLE OF GIS IN ASSET MANAGEMENT
Janice Lerg, Hubbell, Roth & Clark, Inc.
Brian McElroy, Hubbell, Roth & Clark, Inc.
Kevin Fowler, Hubbell, Roth & Clark, Inc.
IMAGIN CONFERENCE – JUNE 2017
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PROJECT LOCATIONS
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Berkley
Village of Beverly Hills
Calhoun County
Delhi Township
East Lansing
Ferris
Grosse Pointe Farms
Independence Township
Linden
Rochester Hills
Sylvan Lake
Troy
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CITY OF SYLVAN LAKE
• GIS database for storm sewer:• Original GIS database was very
incomplete
• The entire City was mobile mapped (laser scanned) to develop the base for the structures
• As-built plans utilized to complete the GIS
• Manhole Inspections updated structure information
• Televising information updated piping information
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CITY OF TROY
• Established Robust GIS System and Practices:
• Large dense area
• GPSed with <.15 ft accuracy
• City Supplied Mobile App for Inspections
• Live Updates
• Opted out of using a standard NASSCO inspection form
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FERRIS STATE UNIVERSITY
• Project Included:• Original GIS database was in a
SQL/AutoCAD program
• A Primary Goal was to update GIS
• Ongoing Pipe Maintenance during GIS development
• Asset Management Plan determined by Engineers using Excel instead of GIS
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GROSSE POINTE FARMS
•Project Included:
• Old combined system in half of City
• Recently (1999) separated system in other half of City
• Provided contractor with web map to use for CCTV inspections
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CALHOUN COUNTY
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• Drain Inspections
• Drainage District Delineation
• Storm Water Management Plan
• Drainage Guide
• Enhanced National Wetland Inventory
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BERKLEY
•Project Included:
• Google Maps used for initial maps for GPS crew
• Digitized entire sewer system based primarily on Google Street View, field maps, and field work
• Locate CIPP candidates
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HUGE LEARNING CURVE
• Collector
• NASSCO forms/db
• CCTV data
• Models
• Communication
• Revise, Revise, Revise
• Document Everything
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BASIC PROCESS
• Meetings, Communication – try to be involved in all aspects related to GIS or data used in GIS
• GIS/Maps/GPS – try to get the best base to start with• Inspections – what app/software/who/when• CCTV – GIS needs direct contact with crew, GIS
extension very helpful• Models/Excel/GIS vs Engineer – who will crunch
numbers• Reporting – maps, summaries, tables, data dictionary• Deliver to Client – data, collector maps, dashboards,
training, Asset Management Plan10
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ASSET MANAGEMENT
• Develop Asset Management Plan for Sanitary and Storm Sewer Collection Systems: (from the Engineers Perspective)
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From EPA Fundamentals of Asset Management
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GIS IS THE KEY
GISCommunication
FieldWork
LookupTables
Modeling Iterations
Documentation
Reporting
FinalDelivery
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FIELD WORK PREP
1. Receive GIS from client
- Usually a geodatabase
- Occasionally CAD
- Sometimes NONE!
- Assess the dataAccuracy
Completeness
Sufficient ID’s?13
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ASSESSMENT OF DATA
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FIELD LOCATION
2. Various methods of collecting a structures location.
- Survey grade GPS
- Google Street View
- Use of photos
- As-Builts
-Mobile Lidar
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SURVEY GRADE GPS
• Most SAW GPS work was done using survey grade GPS units.
• Connects to CORS towers
• Receives RTK corrections
• 99% of GPS points collected where within 0.15 ftaccuracy
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GOOGLE STREET VIEW
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• Used to assist in heads up digitizing
• Good starting point if data is missing in GIS
• Good for collecting X & Y but not Z
• Followed up with GPS
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LOCATION PHOTO
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• A photo is taken during the inspection that shows the structure and a near by land mark
• The landmark is found in the aerial and the structure is placed in reference to its location in the photo
• Client found CCTV work to be a higher priority than GPS
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AS-BUILTS
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• Useful for populating other attribute information
• Allows us to view the other surrounding utilities
• Profiles can be used to verify elevations and flow
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MOBILE LIDAR
•Mobile Lidar Scanning
• Creates point cloud data
• Scans everything within range
• Extract utility data through
AutoCAD/Microstation
• Level of accuracy
Map grade – Survey Grade
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METHODS OF COLLECTION
•Collector for ArcGIS
• Provide clients with own user names for personal access
• Create dashboards to show project status
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•Used custom made apps
• Allowed for live access to clients network
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MACP INSPECTIONS
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• Typically use a hybrid version of both NASSCO’s level 1 and level 2 inspections
• Examples of additional fields used
Chimney depth Chimney condition
Cone condition Wall diameter
Pipe cardinal direction
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A PEAK INTO A SEWER
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Wall Material?Concrete
Pipe 1?Clock position?
Cardinal Direction?6 o’clock
West N
Step Material?Metal
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ADDITIONAL DATA
Pervious/Impervious
Zoning
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• In order to perform the final analysis some additional GIS data is needed.
Soil
Road centerline
Hydrology
Critical Areas
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ANALYSIS DIFFERENCES
• The final variables that will be used in the analysis are dependent on the client.
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POINT PLACE
BIKINI BOTTOM
SUNNY TOWN
X X X X X X X
X X X X X X X X X
X X X X X
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ANALYSIS DIFFERENCES
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Grosse Pointe Farms
Berkley
The location of natural featurescan effect the analysis model
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ANALYSIS DIFFERENCES
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Troy
Linden
The location of the sewer structurescan effect the analysis model
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GIS IS THE KEY
GISCommunication
FieldWork
LookupTables
Modeling Iterations
Documentation
Reporting
FinalDelivery
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CONDITION/CRITICALITY
• Condition of asset used to estimate Probability of Failure (POF):
• May include factors such as age, soil type, material of construction, CCTV scores
• Criticality determined to estimate Consequence of Failure (COF):
• May include location (surface water, railroad), surface type (road/grass), customers/flow, critical areas
• Business Risk Evaluation (BRE) = POF x COF
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Using GIS to develop POF/COF/BRE:
• Cost Factors• Rehab Factors• Material• Pipe Age• Soil Type• Rehab Costs
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Using GIS Model Builder to develop COF:
DiameterDepth
Surface Type Proximity to
Water Body
Critical Areas
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Close to Water
Near Railroad
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Using GIS Model Builder to develop POF:
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Cracks/Holes in Structure
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Pipe Collapse
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• Pipe buckling
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Using GIS to develop BRE:
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BRE = POF x COF
• Map identifies areas with BRE score results
• Also indicating any “critical” areas
Starting point to further refine and develop CIP and/or O&M costs
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LINING CANDIDATES
•Combination of BRE and PACP quick score
•Review CCTV data to confirm findings
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GIS IS THE KEY
GISCommunication
FieldWork
LookupTables
Modeling Iterations
Documentation
Reporting
FinalDelivery
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DELIVERABLES
•Geodatabase
•ArcGIS Online data
•Dashboards
•Training
•Reports
•CIP/AMP
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GIS IS THE KEY
GISCommunication
FieldWork
LookupTables
Modeling Iterations
Documentation
Reporting
FinalDelivery
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QUESTIONS
IMAGIN CONFERENCE – JUNE 2017