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January 2012 pw://Carollo/Documents/Client/CA/Carlsbad/8308A00/Deliverables/Report/Appendicies/Appendix_G.doc
Appendix G
HYDRAULIC MODEL MANUAL
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This manual is intended as a reference for the District in utilization of the hydraulic model
prepared as a part of the Carlsbad Recycled Water Master Plan. This manual pulls
extensively from materials prepared as a part of the master plan, especially the model
development chapter (Chapter 6). For further details on the calibration efforts, refer to
Chapter 6 of the master plan.
G.1 HYDRAULIC MODEL OVERVIEW
Rapid innovations in personal computing and the large selection of software have made
network analysis modeling efficient and practical for virtually any water system. Hydraulic
modeling is an important tool for analyzing a water system. Hydraulic models can simulate
existing and future water systems, identify system deficiencies, analyze impacts from
increased demands, and evaluate the effectiveness of proposed system improvements,
including those within capital improvement plans. In addition, a hydraulic model provides
both the engineer and water system operator with a better understanding of the water
system. Hydraulic models are typically composed of three main parts:
• The data file that stores the geographic location of facilities. The geographic data file
provides water system facility locations and is typically represented as an AutoCAD or
geographic information systems (GIS) file. Elements used in this file to model system
facilities include pipes, junction nodes (connection points for pipes and location of
demands), control valves, pumps, tanks, and reservoirs.
• A database that defines the physical system. The database for the District’s model is
linked to the geographic data file. The database includes water system facility
information such as facility size and geometry, operational characteristics, and
production/consumption data.
• A computer program “calculator”. This calculator solves a series of hydraulic
equations based on information in the database file to define and generate the
performance of the water system in terms of pressure, flow and operation status.
The key to maximizing benefits from the hydraulic model is correctly interpreting the results
so the user understands how the water distribution system is affected by the various
components of the model. This understanding enables the engineer to be proactive in
developing solutions to existing and future water system goals and objectives. With this
approach, the hydraulic model is not only used to identify the adequacy of system
performance, but is also used to find solutions for operating the water system according to
established performance criteria.
Developing an accurate and reliable computer model begins with entering the best
available information into the database and calibrating the model to match existing
conditions in the field. Once the model has been calibrated, it becomes a valuable tool to
evaluate operational problems and to plan distribution system improvement projects.
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G.2 HYDRAULIC MODEL DEVELOPMENT
G.2.1 Hydraulic Model Selection
Several software programs are widely used to model distribution systems. The variety of
program capabilities and features makes the selection of a particular software program
generally dependent upon three factors: user preference, the requirements of the particular
water distribution system, and the cost associated with the software.
The District has selected H2OMAP® Water, developed by MWH Soft, Inc., for the hydraulic
modeling of its recycled water distribution system.
G.2.2 Previous Hydraulic Model
The District’s initial hydraulic model of its recycled water distribution system was developed
in 2000 as a part of the Encina Basin Recycled Water Distribution System Study (JPA,
2000) using H2ONET® Version 2.0.
The hydraulic model provided to Carollo Engineers at the beginning of this project was
developed by District staff in H2OMAP® Water.
G.2.3 Hydraulic Model Creation
The District provided GIS layers containing relevant information concerning its pipeline
network. Since the level of detail and topology of the District’s GIS layers was judged to be
more representative of the recycled water distribution system than the previous hydraulic
model, the District’s GIS layers were imported into the hydraulic model rather than the
pipelines from the previous hydraulic model. Facilities and controls were then adapted from
the previous hydraulic model. In summary, the model creation process involved the
following steps:
• Link Creation. Links were created from the District’s GIS layers of pipeline elements
to represent the District’s recycled water system.
• Node Creation. Nodes were automatically generated at the intersections of pipeline
segments. Individual nodes representing specific components of the City’s recycled
water system such as tanks and reservoirs were added.
• Attribute Data Input. Unique attribute data was assigned to each link and node.
• Facility Creation. Facilities were imported from the previous hydraulic model and
verified through discussions with District staff.
• Operational Data. Based on the previous hydraulic model as well as discussions with
District operations staff, control parameters were assigned to the appropriate links
and nodes.
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The model operates according to the operational and physical attributes assigned to each
node and link. This information is used to simulate flows and pressures within the system
as predicted by the model’s mathematical equations. A screenshot of the hydraulic model is
shown in Figure G.1.
Figure G.1 Screenshot of Hydraulic Model
G.2.4 Model Pipelines
Hydraulic models consist of links and nodes to model representations of physical system
components of a distribution system. Links are used to represent pipes, pumps, and control
valves. Pipeline segments represent the actual transmission or distribution water pipelines.
In the attribute table for each pipe, data typically includes diameter, length, C-factor, and
pressure zone. The model calculator uses the attribute data to determine increases or
decreases in energy levels across the link. Some of the reported output data which the
model calculates for links include flows, velocities, head loss, and changes in hydraulic
grade line.
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G.2.5 Model Nodes
Nodes represent the connections between links and may act as either a supply source,
such as a reservoir or tank, or a customer demand. Nodes also define the boundaries of
each link and separate links that may contain different attributes. Each node also has an
elevation that fixes the elevations of the connecting link elements. Attribute data associated
with each node typically includes elevation, water demand, and pressure zone. The model
calculates system pressures, hydraulic grade lines, demands, and water quality parameters
at each node.
G.2.6 Demand Allocation
For the existing system, demands were allocated based on historical billing records for the
calendar year 2008. Demands from customer meters were allocated to the existing junction
within the hydraulic model nearest the location of the meter in the City’s GIS layer of
meters.
Locations of meters for the five largest users were imported directly from the City’s GIS
layer of meters, giving the five largest users their own nodes. These meters are assigned
the same Meter ID as the City’s GIS layer and the name of the customer is included in the
Description field for the junction element.
For the future system, demands from the customer database were allocated to the nearest
junction …
G.2.7 Elevation Allocation
Elevations were linearly interpolated to all junctions from the City’s GIS layer of ground
elevation contours. This contour layer has 2-foot intervals and according to the filename
reflects topography in 2005.
As a part of model development during calibration, elevations were adjusted in the vicinity
of Whiptail Loop north of Faraday Avenue to reflect grading changes made after 2005.
For pipeline segments extending outside the coverage of the elevation contours provided
by the District, approximate elevations were calculated from data obtained from USGS
(USGS, 2010).
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G.3 SCENARIOS
Table G.1 Scenarios
Recycled Water Master Plan
Carlsbad Municipal Water District
Scenario Name Description Intent Comment
BASE Base Network Scenario Not for Use
CALIB Calibration Scenarios Calibration Use Time
Setting: CALIB_024HRS
EXIST Existing Scenarios Existing System
FUTURE Future Scenarios Not for Use
FUTURE_ALGN Future Alignments Analysis Expansion
Segments
FUTURE_ALT Future Alternative Expansion Analysis Alternatives (e.g., TAP Connection)
FUTURE_ULT Future Ultimate Analysis Build Out
G.4 DEMANDS
G.4.1 Demand Conditions
Rather than using separate demand sets for the various demand conditions, the model is
set up to utilize the demand multiplier as the seasonal peaking factor for different demand
conditions.
The advantage of this method is that when adding a new demand to the existing system, it
is only necessary to add it to the active demand set; it is not necessary to replicate it in
multiple demand sets for Maximum Month Demands, Average Day Demands, etc. The
primary disadvantage is that a single seasonal peaking factor is used for all customers.
To change the current demand condition, choose the desired demand condition from the list
of Simulation Options in the Run Manager.
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Table G.2 Demand Conditions
Recycled Water Master Plan
Carlsbad Municipal Water District
Simulation Options ID
Description of Demand
Condition Seasonal Peaking Factor
AAD_WQ Average Annual Demand 1.0
MMD Maximum Month Demand 1.7
NDD Minimum Month Demand 0.2
The above seasonal peaking factor is entered into the Global Demand Multiplier dialog box
of the Demand tab in Simulation Options for each demand condition.
G.4.2 Demand Sets
Demand sets are used to model different scenarios for the distribution system. For
example, the future system includes customers that are not represented in the existing
system. Within H2OMAP® Water, scenarios are assigned a Demand Set, corresponding to a
specific demand condition.
The model includes five demand sets, details of which are shown in Table G.3.
Table G.3 Demand Sets Recycled Water Master Plan Carlsbad Municipal Water District
Demand Set ID Intended Use
BASE Not for Use
CALIB Replication of Calibration Scenario
EXIST_ADD Average Day Demand
FUTURE_ADD Future System (All Expansions Included, but no
Ultimate Demands)
ULTIMATE_ADD Ultimate Demands (no temporary agricultural demands)
The above seasonal peaking factor is entered into the Global Demand Multiplier dialog box
of the Demand tab in Simulation Options for each demand condition.
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G.4.3 Demand Tables
Within H2OMAP® Water, each Demand Set consists of a demand table containing nine
fields of demands assigned to each junction, named Demand1 through Demand9. Each
field can represent a component of demand. For the calibration and existing scenarios, the
demand tables use only the Demand1 field. For the future system demand sets, the fields
Demand1 through Demand3 are used to clarify the inclusion or relevancy of demands.
Table G.4 Demand Table Fields Recycled Water Master Plan
Carlsbad Municipal Water District
Field Name Demand Source
Demand1 Existing System Demands
Demand2 Potential Customers (from Customer Database)
Demand3 New Development Areas (with indefinite timing)
It is recommended that when testing alternatives in the existing system Demand2 through
Demand9 are used to avoid unintentionally adding demands into the existing system
database.
G.5 FACILITIES
Table G.5 describes how each of the District’s facilities are modeled in the existing and
future systems.
Table G.5 Modeling of Facilities Recycled Water Master Plan
Carlsbad Municipal Water District
Facility Facility Type Modeled As Notes
Carlsbad WRF Discharge Pump
Station
Pumps (3) Two additional pumps in
Future scenarios
Carlsbad WRF Equalization Basin Cylindrical Tank
(Equivalent)
Additional equalization
basin is in the model but inactive for future scenarios.
Avenida Encinas PRV Pressure Regulating Station
Valves (2-PRVs)
Twin D Booster Pump Station
Pumps (4) One is off due to firm capacity.
Twin D Ralph Valve Valve (PSV)
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Table G.5 Modeling of Facilities
Recycled Water Master Plan Carlsbad Municipal Water District
Facility Facility Type Modeled As Notes
Twin D Potable Makeup Connection
Not Modeled Not Modeled
Twin D Reservoir Cylindrical Tank (Equivalent)
C Tank Reservoir Cylindrical Tank
La Costa / Poinsetta
PRV
Pressure Regulating
Station
Valves (2-PRVs, 1-
Relief)
Corintia Valve Isolation Valve Valve (1-TCV)
Mahr Reservoir Tank (Variable Area)
Bressi PS Pump Station Pumps (3) Includes
hydropneumatic tank
Faraday PRV Pressure Regulating
Station
Valves (2-PRVs, 1-
Relief)
Meadowlark WRF Discharge Pump
Station
Pumps (3) Not modeled in Existing
and Calibration Scenarios
Meadowlark WRF Clearwell Cylindrical Tank
(Equivalent)
Not modeled in Existing
and Calibration Scenarios
Calavera PS Pump Station Pumps (3) Includes
hydropneumatic tank
Village PS Pump Station Pumps (2) Modeled as VSP; one is
off due to firm capacity.
Carlsbad WRF Low Pressure PS Discharge Pump Station
Pumps (2) Modeled as VSP; one is off due to firm capacity.
Holly Springs HOA PS
Pump Station Pumps (3) Includes hydropneumatic tank
VID PS Pump Station Pump (1) Modeled as VSP.
Salk PRS Pressure Regulating
Station
Valve (1-PRV)
Cannon PRS Pressure Regulating Station Valve (1-PRV)
Quarry Creek PRS Pressure Regulating
Station
Valve (1-PRV)
La Costa Ridge PS Pump Station Pumps (2) Modeled as VSP; one is
off due to firm capacity.
Santa Fe Tank I Reservoir Cylindrical Tank
Zone 550 Tank Reservoir Cylindrical Tank
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G.6 DATABASE FIELDS
G.6.1 Attribute Data Information
For junction elements, attribute data was added for the fields DMD_NODE, FACILITYID,
FAC_NODE, LARGEUSER, STATUS, LOGGER, and LOGGERID. The LOGGER and
LOGGERID fields were added as a part of the calibration process. Descriptions for the
junction fields added to the model as well as sources are shown in Table G.6.
For pipeline elements, attribute data was imported from the City’s GIS pipeline layer for the
fields Diameter, Material, Zone, Year of Installation, and Facility ID. Descriptions for all the
fields added to the pipeline elements in the model as well as sources are shown in
Table G.7.
Table G.6 Junction Attribute Data Fields Recycled Water Master Plan
Carlsbad Municipal Water District
Field Name Description Valid Entries Source
DMD_NODE Indicates if a demand is placed on
the junction.
Boolean
(Yes or No)
Demand Allocation
FAC_NODE Indicates if the junction is a part of a facility. Boolean (Yes or No) Generated by Consultant
LARGEUSER Indicates if the junction represents the meter of a large user. Boolean (Yes or No) City’s meter GIS layer.
STATUS Indicates whether a facility is
active in the existing system.
ACT, ABAN City’s pipeline GIS
layer: “STATUS”
Field
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Table G.7 Pipeline Attribute Data Fields Recycled Water Master Plan Carlsbad Municipal Water District
Field Name Description Valid Entries Source
DIAMETER Diameter of pipeline Integers City’s pipeline GIS layer: “Diam” Field
MATERIAL Pipeline material ACP, CML&C, DI, STL, PVC
(with class)
City’s pipeline GIS layer: “PIPETYPE” and
“PIPECLASS” Fields
ZONE Pressure zone which pipeline is a part of. 318, 384, 550, 580, 660 City’s pipeline GIS layer: “PressZone” Field.
YR_INST Year pipeline installed. Adapted from year of “ASBUILT” field. For pipelines with unknown “ASBUILT”
field, used “SIGNDATE” field.
Integer, 9999 used for unknown
years.
City’s pipeline GIS layer: “ASBUILT” and “SIGNDATE” Fields.
FACILITYID Unique Identifier. Not included on pipelines not from the City’s GIS. WM##### City’s pipeline GIS layer: “FacilityID” Field.
FACILITY Indicates whether an element is part of a facility (i.e., pipeline segments used for modeling
purposes rather than actual pipeline in the ground)
Boolean (Yes or No) Generated by Consultant
STATUS Indicates whether a facility is
active in the existing system.
ACT, ABAN City’s pipeline GIS layer:
“STATUS” Field
WQ_GROUP Group number for water quality
pipe coefficient calculation (in
calibration).
Integer Created from material,
age, diameter, or
geographic location
RESID Average chlorine residual under
typical conditions
Number Calculated from
convergence of
residuals for full system (during water quality
calibration)
SRVC_AREA Service area in which the pipeline is located (or owner). CMWD, OMWD, VID,
and VWD
Geographic location
EXP_LAT Indicates which expansion segment future pipelines belong to 1 through 19, 99 For future pipelines, assigned as a part of
future system analysis.
SPCLCNST Indicates whether special
construction conditions apply to
future pipelines
SL (sliplining) For future pipelines,
assigned as a part of
future system analysis.
PRIORCNST Indicates whether a future pipeline is already constructed Boolean (Yes or No) For future pipelines, assigned as a part of
future system analysis.
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G.7 DATA SETS
G.7.1 Pipe Sets
Two pipe sets are used in the hydraulic model:
• EXIST
• FUTURE
The FUTURE pipe set was created to account for the potential decrease in friction factors
as pipelines in the distribution system age. As outlined in Chapter 7, a Hazen-Williams
roughness coefficient of 120 was used for pipelines over 20 years of age. For the future
system, all existing pipelines were assumed to be greater than 20 years of age by this time.
G.7.2 Control Sets
Three control sets are used in the hydraulic model:
• CALIB
• EXIST
• FUTURE
The CALIB control set is used to establish the specific and detailed controls from the
calibration period. This control set should only be used to replicate calibration conditions.
The EXIST control set represents the typical operations of the system as determined from
discussions with District operations staff. Changes to the District’s typical control strategies
should be made in this control set.
The FUTURE control set was created based on the facilities added as a part of the future
system evaluation. Some controls for existing facilities were modified to incorporate
proposed facilities. Note that all future scenarios use the same FUTURE control set.
G.8 MODEL MAINTENANCE PROCEDURES
The hydraulic model is setup to use Query Sets for switching the active facility set within
each scenario. If new elements are added to the model, they will behave as active until the
model scenario is changed unless the STATUS field is properly populated. If the STATUS
field is not populated, the new element will become inactive after switching scenarios.
Ordinarily, this should cause the model to be resilient towards unintended modifications due
to temporary analysis or “what if” scenarios, but this may create some unexpected errors if,
for instance, junctions are inserted into an existing pipeline segment without the STATUS
field of the junction set to match the pipeline.
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Three query sets are included that are used for switching between scenarios:
• FAC_ACTIVE: Existing system and Calibration scenarios. Includes elements with the
STATUS field of “ACT”
• FAC_PROPOSED: Future system scenarios. Includes elements with the STATUS
field of “ACT”, “POTABLE”, “FUTURE”
• FAC_ULTIMATE: Ultimate system scenarios. Includes elements with the STATUS
field of “ACT”, “POTABLE”, “FUTURE”, and “ULTIMATE”
To create elements within the existing system scenario (that are intended to remain in the
existing system scenario), populate the STATUS field of all the elements with “ACT”
(without quotes).
Note that some elements have STATUS values other than those stated above, for instance
“NONE” or “ALT”. These elements were not intended to be active, but are added to the
model for analyzing alternatives. For instance, there is a second equalization basin at
Carlsbad WRF that has a STATUS value of “NONE”, used when analyzing if an additional
equalization basin would assist in a particular scenario or alternative.
"C" Tank
Carlsbad WRF
Gafner WRF
Mahr Reservoir
Meadowlark WRFand PS
Agua HediondaLagoon
Twin "D" Tanks
Calavera PS
CWRF PS
Bressi PS
"D" Tank PS
Pacific Ocean
Batiquitos Lagoon
Buena VistaLagoon Oceanside
Shadowridge WRF
LakeCalavera
Corintia Meter
OMWDMeter
C080
C023
C002
C030
C109
MaerkleReservoir
Tri Agency Pipeling (TAP)
14
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E xistin g F ails a fe P ip elin e
San Marcos
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Vallecitos Water District
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Figure 10.6Potential Expansion SegmentsRecycled Water Master PlanCity of CarlsbadFILENAME: c:\pw_working\projectwise\lwang\d0102644\Figure_10_6-Potential Alignments.mxdDATE: 5/17/2011Legend
Existing Recycled Water Pipelines
Existing Recycled Water Pipelines
Potential Expansion Segment
Segment 1
Segment 2
Segment 3
Segment 4A
Segment 4B
Segment 4C
Segment 5
Segment 6
Segment 7
Segment 8
Segment 9
Segment 10
Segment 11
Segment 12
Segment 13
Segment 14
Segment 15
Segment 16
Segment 17
Segment 18
Other (Not for Specific Expansion segment)
Recycle Water Facilities
Pump Station
Pressure Regulating Station (PRS)
Meter
WRF
Tank
Reservoir
Inactive WRF
Potential Recycled Water Customers
Agricultural Irrigation
Landscape Irrigation
Commercial or Industrial Process Water
Other
Water District Boundaries
Carlsbad Municipal Water District
City of Oceanside
Olivenhain Municipal Water District
San Dieguito Water District
Vallecitos Water District
Vista Irrigation DistrictProposed Facilities
New PRS/Valve
Other
Freeways
Railroad
Carlsbad Municipal Water District
Parcels
Potential Golf Courses
Water Body
"C" Tank
Carlsbad WRF
Gafner WRF
Mahr Reservoir
Meadowlark WRF
Agua HediondaLagoon
Twin "D" Tanks
Calavera PS
CWRF PS
Bressi PS
"D" Tank PS
Pacific Ocean
Batiquitos Lagoon
Buena VistaLagoon
Oceanside
Shadowridge WRF
LakeCalavera
Corintia Meter
OMWDMeter
C011
C095
C029
MaerkleReservoir
Tri Agency Pipeline (TAP)
F a ils a fe P ip e lin e
Santa Fe I Tank
1
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La Costa PRS14"HAYMAR DR
MARRON RD
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0 1 2Miles
Figure 10.7Build-Out SystemRecycled Water Master PlanCity of Carlsbad
FILENAME: c:\pw_working\projectwise\lwang\d0102644\Figure_10_7-Build Outl Alignments.mxdDATE: 5/19/2011Legend
Existing Recycled Water Pipelines
Existing Recycled Water Pipelines
Already Constructed
Potential Expansion Segment
Segment 1
Segment 2
Segment 3
Segment 4A
Segment 4B
Segment 4C
Segment 5
Segment 6
Segment 7
Segment 8
Segment 9
Segment 10
Segment 11
Segment 12
Segment 13
Segment 14
Segment 15
Segment 16
Segment 17
Segment 18
Other (Not for Specific Expansion segment)
New Development Pipelines
Recycled Water Facility
Pump Station
Pressure Requlating Station (PRS)
Meter
WRF
Tank
Reservoir
Inactive WRF
Potential Recycled Water Customers
Agricultural Irrigation
Landscape Irrigation
Commercial or Industrial Process Water
Other
New Developments
Residential
Commercial Irrigation
Development not anticipated toutilize Recycled Water (Small Parcels)Water District Boundaries
Carlsbad Municipal Water District
City of Oceanside
Olivenhain Municipal Water District
San Dieguito Water District
Vallecitos Water District
Vista Irrigation District
Other
Freeways
Railroad
Carlsbad Municipal Water District
Parcels
Water Body
"C" Tank
Carlsbad WRF
Gafner WRF
Mahr Reservoir
Meadowlark WRF
Agua HediondaLagoon
Twin "D" Tanks
Calavera PS
CWRF PS
Bressi PS
"D" Tank PS
Batiquitos Lagoon
Buena VistaLagoon
Shadowridge WRF
LakeCalavera
Corintia Meter
OMWDMeter
C153
MaerkleReservoir
Gafner PS
La Costa PRS
Meadowlark PS
Santa Fe I Tank
EWPCF
FARADAY PRV
PALOMAR OAKS WYD R Y D E N P L
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La Costa Oaks
Encinitas
Oceanside
Olivenhain Municipal Water District
Vallecitos Water District
Vista Irrigation District
Pacific Ocean
La Costa Ridge
Bressl Ranch
CARLSBAD OAKS NORTH
Carlsbad Ranch
Carlsbad Raceway
Robertson Ranch
Legoland
Kemper SportsManagement
La Costa Resort(South Course)
Aviara ResortAssociation
Park HyattAviara Resort
La Costa Resort(North Course)
A
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8''12''8 ''6''8''8''6''8''8 ''Existing SystemRecycled Water Master PlanCity of Carlsbad
FILENAME: c:\pw_working\projectwise\lwang\d0102644\Figure_10_8-Existingl Alignments.mxdDATE: 5/17/2011Legend
Existing Recycled Water Pipelines
Private
318
384
550
580
660
Existing Recycled Water Pipelines Currently Served by PotableRecycled Water Facilities
Pump Station
Pressure Requlating Station (PRS)
Meter
WRF
Tank
Reservoir
Inactive WRFWater District Boundaries
Carlsbad Municipal Water District
City of Oceanside
Olivenhain Municipal Water District
San Dieguito Water District
Vallecitos Water District
Vista Irrigation DistrictOther
Freeways
Railroad
Carlsbad Municipal Water District
Parcels
Water Body
Carlsbad City Limits
Private
0 0.4 0.8 1.2 1.60.2 Miles