Building and Calibrating the New Bellevue Water System Model

Ed Wicklein Carollo Engineers

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Ed Wicklein, Carollo EngineersDoug Lane, City of Bellevue

Aurelie Nabonnand Carollo Engineers

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PNWS - AWWA

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May 1, 2015

City of Bellevue Service Area

• 2014 population p p140,000+ (~180,000 by 2040)2014 l t• 2014 employment 136,000+ (~214,000 by 2040)

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• Bellevue plus portions of 7 other municipalities

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• Regional Supply (SPU)

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Water System Assets

• 600+ miles of pipe

Bel-Red Inletp p

• 64+ pressure zones• 26 reservoirs (plus share of 426 reservoirs (plus share of 4

outside service area)• 23 pump stations

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p p• 13 inlet stations• 144 pressure reducing valve

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(PRV) stations

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Bellevue Previously Used EPA-NET for Hydraulic AnalysisHydraulic Analysis

• Model results did not• Model results did not match field

• Manual iteration of each fire flow location

• Limited model biliti

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capabilities

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The City Needs an Integrated “all-pipe” Model of SystemModel of System

• East model previously p ydeveloped

• New models for West and S thSouth:

– Should be easily maintainable East Op AreaEast Op Area

West Op AreaWest Op Area

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– Will be used for the ongoing WSP update

– Will be used to aid in

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proposed redevelopment

South Op AreaSouth Op Area

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Bellevue Provided Existing Data for Model Development of West and SouthModel Development of West and South Operating Areas• EPA-NET models• GIS data on system parts

– Pipes, hydrants, key infrastructure locations

• Operational data

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– Pump controls– PRV, altitude valve, and throttle control valve settings

T k i f ti

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• Existing demands by customer meter

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Bellevue Collected New Data for Model DevelopmentDevelopment

• Hydrants tests, including PRV conditions for many of y , g ythe tests

• Static long-term pressure fluctuations• The city conducted winter and summer diurnal

pattern studies for 6 customer classes

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– Hotels, schools, retail, commercial, single-family residential, multi-family residential

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Custom Diurnal Patterns For Customer ClassesClasses

Single-Family ResidentialSingle-Family Residential Multi-Family ResidentialMulti-Family Residential

Commercial / RetailCommercial / Retail HotelsHotels

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SchoolsSchools

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Example of Fire Hydrant Tests Summary• Hydrant tests performed by the City

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GIS Cleaned, Organized and Formatted• Junctions created, elevation from 2-foot contours• Piping connectivity checked

Example of Data compared with as-builts

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connectivity issuesp

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Initial GIS DataInitial GIS Data

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10Formatted GIS data imported in InfoWaterFormatted GIS data imported in InfoWater

Site Configurations Added

• Pump stations, reservoirs, inlets, and interties from fsite configuration drawings and as-built drawing

Example: MeydenbauerInitial GIS DataInitial GIS Data

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City InputCity Input

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11Model ConfigurationModel Configuration

Facility Data Input in InfoWater

• Example: pump station required information

Example: Somerset Inlet Pump 1Example: Somerset Inlet Pump 1Example: Somerset Inlet Pump 1Example: Somerset Inlet Pump 1

Model Required InformationModel Required Information

Pump Curve – Pump Report Pump Curve – Pump Report Model Pump ControlsModel Pump Controls

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City Provided Control SetpointsCity Provided Control SetpointsModel Pump CurveModel Pump Curve

Model LoadingD d di i GIS d ll ti• Demand geocoding in GIS and allocation

• Demands provided by parcel land use type and allocated to the nearest model junction in the appropriate pressure zone

– Demands are actual current demands– City input necessary to determine which zone to allocate the parcel to for

certain areasExample parcel where it is unclear which pressure zone it serves

Example parcel where it is unclear which pressure zone it serves

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West and South Hydraulic Model with SPU SupplySPU Supply

• 40 pressure zonesCedar SourceCedar Source

• 202 PRVs (108 stations)

• 9 Altitude valves• 9 Altitude valves

• 19 Storage tanks

• 1 Hydropneumatic

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1 Hydropneumatictank

• 45 Pump (16 stations)

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T lt ST lt S

stations)

• 8 SPU inlets

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Tolt SourceTolt Source

Initial Model Checks

• System pressures comparison used to locate major errors in model creation

• Facility characteristics from pumps, sources, valves were used to identify problems in system operations

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for CalibrationModel ready for Calibration

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Fire Hydrant Calibration Criteria• Review of AWWA M32 and the 1999 ECAC

calibration recommendations: M32 master planning static calibration goals from hydrant test data:static calibration goals from hydrant test data:

– HGL predicted should be within +/- 10 feetHGL predicted should be within +/ 10 feet (+/- 4.3 psi) of measured values.

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Model Calibration With Field Data

• 70 hydrant testsy• Numerous residual

pressure recorders• SCADA telemetry

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Fire Hydrant Calibration

• Demands set to test time using diurnal pattern Test Time

• Pumps and tanks set from SCADA

Parameters adjusted to match• Parameters adjusted to match field results

– PRV settings mainly to match static conditions

Hydrant Flow

Location Pressure Measurements

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static conditions– Pump curves– Tank elevations

Static and Residual

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pipes mainly to match residual conditions

• Try to hold C factors

Static and Residual Pressure Test Results

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Try to hold C factors constant within every pressure zone

Hydrant Test Results Summary For All Tests

+ 4.3 psi- 4.3 psi

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EPS Run

• Necessary adjustments for EPS run– Time stepTime step– Pump controls– Altitude valves headloss curves

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EPS Run – Altitude Valves

• Altitude valves modeled as float valves and require headloss vs flow type curveheadloss vs flow type curve.

• Typical curve is adjusted to match SCADA data provided by the Cityprovided by the City.

Altitude Valve at Factoria Reservoir ExampleAltitude Valve at Factoria Reservoir Example

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EPS Inlet Results Summary for MDD&

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EPS Tank Results Summary for MDD&

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Subsequent work by the City

• Continual updatesp• Added East Operating

Area (now entire system)

• Automatic fire flow l i ( ll 6 000

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analysis (all 6,000 hydrants at once)

• Water age mapping

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• What-ifs and alternatives analysis S

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alternatives analysis System-Wide Water Age Simulation

Model Development Summary

• A new all pipes integrated model was developed for p p g pBellevue's water service area

• The model is well calibrated for static and EPS making it a good tool for:

– Fire flow analysesS i

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– System operations– Future projections

Water quality

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Questions on Building and Calibrating the New BellevueCalibrating the New Bellevue

Water System Model

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ewicklein@carollo.comdlane@bellevuewa.gov

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@ gPNWS - AWWA

May 1 2015

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May 1, 2015