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Hydraulic Modeling of the Guam Water System
Colin Ricks
May 1, 2015
Guam
Brown and Caldwell 2
Tok
yo: 1
,60
0 m
ile
s
Guam
Guam
Brown and Caldwell 3
Tok
yo: 1
,60
0 m
ile
s
Guam
Guam
Brown and Caldwell 4
Guam
2010 Population: 160,000
Tropical Climate
• Average rainfall: 92 inches/year
• Average temp: 82ºF
Principal Industries:
• Tourism
• US Military
Brown and Caldwell 5
Guam History
~2000 BC – Chamarros arrived
1521 – Ferdinand Magellan
1668 – Spanish colonization
1898 – Surrendered to US
1941 – Captured by the Japanese
1950 – US Territory
Brown and Caldwell 6
Serves civilian population • ~55,000 customers
Water System • 600 miles of pipe
• 29 Tanks, ~29 MG
• 26 Booster Pump Stations
Supply • 38 MGD (avg 2014)
• 120 wells in North
• Surface water in South
• Connections to US Navy water system
Guam Waterworks Authority (GWA)
Brown and Caldwell 7
GWA Challenges
Brown and Caldwell 8
Leaks
GWA Challenges
Brown and Caldwell 9
Leaks
Partially-Closed Valves
GWA Challenges
Brown and Caldwell 10
Leaks
Partially-Closed Valves
Maintenance
GWA Challenges
Brown and Caldwell 11
Leaks
Partially-Closed Valves
Maintenance
Record Keeping
First model built in 2006
Innovyze’s H2OMAP Water
Water Distribution Model
Brown and Caldwell 12
Started GIS from Model Piping
GIS
Brown and Caldwell 13
GIS
Started GIS from Model Piping
GIS Updates
• As-Builts
• Field Work
• Leak Detection
Brown and Caldwell 14
Updated Model
• 2012 - Model converted to InfoWater
• Runs in ArcGIS
• Piping from latest GIS
• Ongoing updates to GIS
Brown and Caldwell 15
Model / GIS Linking
Add New Piping
• Only maintain one database
Brown and Caldwell 16
Fix Piping Alignments
Model / GIS Linking
Model Development
• Standardize and document how model will be built and updated
Brown and Caldwell 17
• GPS Customer Water Meters
Demands
Brown and Caldwell 18
Diurnal Pattern
Demands
Brown and Caldwell 19
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 6 12 18 24
Pe
ak
ing F
acto
r
Hour
Demands
Brown and Caldwell 20
Fire Flow Tests
Hydraulic Calibration
• Check Hydraulics, C Factors, Closed Valves
Calibration / Field Work
Brown and Caldwell 21
Calibration / Field Work
Pressure Loggers
Brown and Caldwell 22
Calibration / Field Work
PRV Location and Setting
Brown and Caldwell 23
Calibration / Field Work
• Verified pump curves
• Pump Tests
Brown and Caldwell 24
Tanks
Operational Calibration
Pumps
Brown and Caldwell 25
0
5
10
15
20
25
30
35
40
45
0 24 48
Le
ve
l (f
t)
Hour
Model Results
Field Data
Top of Tank
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
0 6 12 18 24
Flo
w (
gp
m)
Hour
Model Results
Field Data
Operational Calibration – No SCADA
Tank Levels
Flow Meters
Brown and Caldwell 26
0
5
10
15
20
25
30
35
40
45
0 24 48 72 96 120 144 168 192
Le
vel (f
t)
Hour
Field Data
Top of Tank
Evaluation
• Storage
• Pressure
• Velocity
• Fire Flow
• Supply
Model Analysis / Uses
Brown and Caldwell 27
Hydraulic Schematic
Brown and Caldwell 28
Model Analysis
• Storage - Long Term Plan
• Fire Flow
• Supply
• Realignment of Pressure Zones
Brown and Caldwell 29
Pressure Zone Realignment
Brown and Caldwell 30
Next Steps
Brown and Caldwell 31
• Refine zone realignment plan
• Update model with new GIS
• Identify areas for further field investigation and testing
• Continue improving calibration
Lessons Learned
Brown and Caldwell 32
• Have a good plan for updating model
• Document processes and sources
• Every system is unique
Questions?
33