Schaaf & WheelerConsulting Civil Engineers

Pump Station Modelingfor Interior Drainage

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Presentation OverviewProject TeamWhy ImportantPump Station BasicsCase StudyModel IntegrationPearls of Wisdom

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Why Bother?Impacts FloodingCost ImpactsMore Development

in Pump Dependent Areas

Risk of FailureModel Uncertainty

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Pump Station BasicsHow they workTypesElements

• Wetwell• Pumps• Forcemain• Outfall

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From Field Into Model

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From Field Into Model

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Pump CurvesIf a Performance Curve is Available

• Head-Capacity• Horsepower• EfficiencyIf Not Available

• Field Testing• Gages• SCADA• Name Plate

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Accounting For Losses

excel

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Accounting For LossesDerate the Pump Curve

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Accounting For LossesDerate the Pump Curve

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Set levelsImpact Storage

Volume at PeakPump CyclingPower UsePump Damage

Pump Cylcing Graph

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OutfallsHow they impact

modelStatic vs VariableTidal Why is this

important to modelers?

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Cases Study – North San JoseLocationLandscapeMultiple Pump

Stations

Would that topoimage be better here to describe the problem?

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Constant Flow

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Manufacturer’s Pump Curves

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Derated Pump Curves

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Stage

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Pump Discharge

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Modeling Constraints Data

Missing pump curvesPipe sizesLayout

Improvements and New StationsMultiple pumpsSite constraintsEnvironmental concernsWet WellsCycling/Set Levels

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ConclusionLimit UncertaintyDerate Your Pump Curves!Take into Account ConstructabilityConsider Operations ConstraintsDon’t Master Plan a PS Won’t WorkAsk a Design Engineer

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Questions?