evolution of gis impact on sustainable hydraulic modeling
TRANSCRIPT
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The Evolution of GIS and its Impact on
Sustainable Hydraulic Modeling
Dave Harrington // IDModeling, Inc.
September 15, 2009
Bentley eSeminarwww.idmodeling.com
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Acknowledgments
Industry Colleagues
Cities & Utilities
Fellow Consultants
IDModeling Colleagues
Mr. Paul Hauffen Mr. Brian Powell, P.E.
Mr. Rajan Ray
Mr. Patrick Moore, P.E.
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Agenda
Overview of the Evolution of GIS
Evolution of Hydraulic Modeling
Impact of the Evolution of GIS
on Sustainable (1:1) Models Process and Considerations for
Building Sustainable Models
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Overview of the Evolution of GIS
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Evolution of Hydraulic Modeling
Identify cri tical valves
IDSE Modeling
Flushing planning
Operator training
Finding closed valves
Surge Analysis
Fire sprinkler systems
Raw water pumping
Leakage analysis
Irrigation systemsPipe Replacement Plan
Pump Scheduling
QA/QC of GIS/CAD data
Size pipes
Master planningNon-revenue water analysis
Subdivision design
System extension
System rehab
Fire flow analysis
Troubleshooting
Pump selection
Tank sizing/location
Sensor Location
Management
Online Results Viewer
PRV setting identification
Pressure zone setup
Capital Cost Analysis
Operational changes
Chlorine Analysis
Pump energy usage
Water quality tracking
Water age analysis
Water quality impact of storage
Contamination analysis
Hydraulic ModelingWhats my pressure here?
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Benefits of Sustainable Models
Easier to build and update accurately
Stay consistent with data in GIS
Do not require skeletonization
Enables more detailed, flexible demand allocation Calibration is streamlined
Opens the door for advanced applications such as
IDSE, UDF, water quality, valve criticality, energyusage, operational modeling, etc.
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Planning for a Sustainable Model
A sustainable 1:1 model is now a realistic option
More widespread use of geometric networks and better-defined networkrules are enabling easier model creation and updating
Recommended business process steps
Review GIS structure, attributes, connectivity, rules
Verify that IDs are fully populated, unique, and stable
Identify your modeling requirements
List all the steps in the proposed model creation / update process
Identify ways to track future updates (additions, deletions, modifications)
List any changes desired in the source GIS
Discuss the proposed changes with GIS group in detail
Get consensus on the changes up front and document everything
Test the process
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Steps for Building a
Sustainable Model 2
Model Components
Pump curves Demands
Controls C-factors
Patterns Scenarios
Questions Etc.
Changes/EditsNew features Pipe length
Aband. features Pipe diameter
Pipe splits Elevations
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Important Points for Sustainability - 1
How elements are connected together
(i.e., their network topology) is crucial for models Many topological issues are difficult to find by eye
Topological accuracy in the source data is critical
for an accurate model
Geometric Networks can resolve many typical issues observed Unfortunately problems, can still arise!!
Inspect the GIS, identify and correct any topology issues
before the model is constructed use the software tools
to help you
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Important Points for Sustainability - 2
Watch out for identity theft
Modeling requires a unique ID for each element
The GIS attribute OBJECTID may not be unique
throughout the entire GIS, and is not necessarily a
stable field not a good choice for your model ID Consider creating a stable attribute field called
MODEL_ID. Create rules in your geodatabase to
ensure this attribute is unique throughout the
entire geodb, fully populated, and stable
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Important Points for Sustainability - 3
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Important Points for Sustainability - 4
Facilities in GIS may not include much detail
Why? You typically dont need that level of detail!
Some facilities require special work to prepare
them for export from GIS to model
Some detail may have to be removed Multiple connected reservoirs
Some detail may have to be added
Point-type PRV vaults need to represent valves in parallel
Point-type booster stations need to represent pumps in parallel
versus
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Process GIS Data to
Prepare for Modeling
Translation from GIS to model
Make the base GIS 1:1 with model topology
(typically not achievable)
OR
Use a translation utility
Home-made - custom scripting, or
Off-the-shelf
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Visual Workflow of Processing
GIS Data to Prepare for Modeling
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Important Points for Sustainability - 5
Track what has changed
What has been added?
What has been removed/abandoned?
Which attributes have been modified?
Track when it changed To enable future incremental model updates
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Important Points for Sustainability - 6
Updates involve more than just preserving or
updating features and geometry
Model demands
Base and customized demands
Extended attributes
Diurnal patterns, pump curves, controls, etc.
Scenarios
Data sets, facility sets
L f B ild f
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Lessons for Builders of
Sustainable Models
The best process is one that is customized for
your data and your business needs
Theres no substitute for project momentum
Rules, consistency, and documentation are just
as vital to a sustainable hydraulic model as theyare to a sustainable GIS
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Summary on Sustainable Modeling
The evolution of GIS is helping the development
of sustainable models
Review the topology of your GIS in detail and iterate to
identify and resolve connectivity issues
Review all proposed GIS changes in detail with GIS group
and get their input and buy-off
There are software tools available to help build sustainable
models, but you still need good data, and a solid,
well-documented process
Successfully building a sustainable model is a balancingact, keeping in mind the details and the overall process
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Additional Resources
Book
Best Practices for Sustainable GIS andHydraulic Model Integration To be published in 2010, ESRI Press
IDModeling, Black & Veatch, and ESRI
White Paper
A Guide for Water Utilities of All Sizes Presenting Best Practices for Sustainable GIS and Hydraulic Model Integration
To be published in early 2010, ESRI Press
IDModeling and Black & Veatch
AWWA M32 Manual New Edition
Includes updates specific to GIS+Modeling
Discussion forums
Blogs and forums on www.hydraulicmodel.com
Bentleys Water and Wastewater Network Analysis and Design Forum
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The Evolution of GIS and its Impact on
Sustainable Hydraulic Modeling
Dave Harrington // IDModeling, Inc.
September 15, 2009
Bentley eSeminarwww.idmodeling.com