© 2

009

Ben

tley

Sys

tem

s, In

corp

orat

ed GeoSpatial Water Distribution, Sanitary Sewer and Stormwater Network Modeling

Angela Battisti, Gary Griffiths

Bentley Systems Inc

Angela Battisti, CE, MBA

Civil EngineerMaster in Business Administration6 Years of Water Industry Experience3 Years of Hydraulics & Hydrology Modeling

Training ExperienceOver 500 Presentations and Training Worldwide

Presenter Profile

Minimize Costs Capital investment, operations and maintenance.Maximize Benefits Hydraulic performance & system reliability.

Why use Models?

To gain commanding knowledge of their Water, Wastewater &

Stormwater infrastructure and make informed decisions.

Benefits of hydraulic modeling

Models  let  you  ”see”  what  is  happening in your pipes

And  “predict  the  future”  before  you  build

How are the models used?

Site development

Urban stormwater management

Fire flow analysis

Master planning

Typical Users

Sewer capacity analysis

WaterQuality

Modeling

PumpingOptimization

DistributionMains

• Plan & regulatory reviewers• Design & consulting firms• Municipal & Governments• Regional drainage planners• Site designers• Utility operational engineers• Detention & retention facility designers• Roadway & transportation designers• Master Planners• Academia

GIS / Water modeling relationship

Build Water models from GIS dataMaintain model up-to-dateLoad Water models from billing records (meters)Assign demand elevation from terrain filesCorrelate model results with GIS data (ex: queries

vulnerable pipes and hospitals)Generate reports, export to Google Earth, etc.

Why build models from GIS?

Because it is much faster and easier to build your model from GIS than any other method,

provided you avoid some pitfalls

x,yx,y

CAD

P-1d= 8 in

L= 320 ftc= 111

Ductile IronStart node =J-1Stop node = J-2

J-2z=365 ft

x,y

J-1z=357 ft

x,y

GIS

WaterGEMSModeling Data

*.wtg

*.wtg.mdb

AutoCAD Stand Alone

MicroStation

*.dwg *.dwh

*.dgn

ArcGIS

*.mxd

The only 4 platform water distribution modeling package on the market!!One single model file, four platforms included!

WaterGEMS

Interoperability – 4 Platforms – one database

BUILDING A HYDRAULIC MODEL FROM GIS DATA

It’s  all  about  relationships  

GIS features WaterGEMS elements

Not always a 1:1 relation

GIS features WaterGEMS elements

Importing GIS to model : ModelBuilder

GIS Sources in WaterGEMS, SewerGEMS, HAMMER (ArcGIS interface): Geometric Network, Geodatabase features, and Shapefiles

GIS Sources in WaterCAD, SewerCAD, CIvilStorm, PondPack or StormCAD : Shapefiles

GIS not created with hydraulic model in mind

GIS has:

Hydraulic modeling needs:

Pump

Flowmeter

Check valve

Gate valve

NEEDED FOR MODEL STATION IN GIS

Teefitting

Element Representation

REAL LIFE

Main Service lines Hydrant

Isolation Valve

ControlValve

Air releaseValve

Detailed view

P-21 P-22

PRV-4

J-201

J-202

Skeletonized Model View

What is a pipe?

Skelebrator

Reduces model size intelligentlyDepends on use of model

Before Skelebrator

After Skelebrator

Avoiding Connectivity IssuesPipes without end nodes

Pipes  that  don’t  connect  but  should

Pipes  that  appear  to  connect  but  aren’t

Pipes that cross without junctions

Connectivity rules and Network Navigator

Maintaining GIS and model up-to-date

Day 1 Year 1 Year  2                                          …

GIS

GIS

GIS

Model

Model

Model

GIS rules and GIS ID

What’s  that  GIS  – ID?

1:1 ,or, many :1 ,or, 1: many

ModelBuilder will intelligently maintain GIS-ID when:• Deleting• Morphing• Splitting pipes• Merging Nodes in Close Proximity

ADDING DEMANDS

LoadBuilder- Automated Load Assignment

Water Consumption Data Loading

Flow Monitoring Data Loading

Land Use Parcel and Census

Data Loading

Automated Elevation ExtractionAutomated extraction of elevations from digital elevation models

Intelligent elevation assignment

• Assign elevations to all node elements

• Create new what-if elevation or replace existing elevation

Citywater saves money through Modeling

Townsville, AustraliaFastest growing city in the state of Queensland

134 km of gravity mains, 17.5 km of rising mains (force mains)

20 pumping stations

CitiwaterTownsville’s water and sewer business unitResponsible for:

monitoring capabilities of existing systemmanaging infrastructure improvements to ensure it can support expansion

Consulting firm: GHD Pty. Ltd.Develop a calibrated model of the 4 main regions of TownsvilleProvide a 15-year planning report for southern suburbs of Townsville

Model Building process

Created sewer model directly from GIS Shapefile and DrawingReview to « clean » the data

2500-pipe sewer model

Sanitary loading data from the 250 subcatchments in MapInfo GIS, imported using ModelBuilder

Analysis

Calibration

Model Building70%

20%

10%

Calibration of flow

Calibrated using 4 scenarios:

Steady-state and average daily flowSteady-state and peak daily flow

Extended-Period and average daily flowExtended-Period and peak daily flow

To calibrate observed flows in gravity sewer

To calibrate flows in pumping stations and rising mains (force mains)

Analysis

Calibration

Model Building

Modeling ResultsAchieved high level of validation to use Wastewater model to:

Confidently make important financial decisions regarding future augmentation work

Undertake capital works planning and design Make overall operations and maintenance adjustments

Increase the accuracy of emergency planning Conduct financial analysis

1. Decide  who,  how,  when…  of  model  maintenance  BEFORE you build the model

2. Plan GIS schema for use in Hydraulic modeling IF possible. ESRI template

2. Create and maintain unique GIS IDs3. When building model obtain necessary data not likely to

be in GIS:• pump curves• demand/loading patterns• pump and valve controls• more

Recommendations

Resources

Tech Support Tech Notes:

Building a Model Using ModelBuilder

Updating A Model Using Model Builder

Updating Source File Using Model Builder

Discussion Forums:

BE communities – Water and WasteWater

Hydraulicmodel.com

© 2

009

Ben

tley

Sys

tem

s, In

corp

orat

ed

Thank You!