Sewer Modeling Package Sewer Modeling Package Selection Process as it Selection Process as it

Relates to GIS and Relates to GIS and Usability Usability

Olathe Municipal ServicesOlathe Municipal Services

TopicsTopics

EPA SWMM EngineEPA SWMM Engine

General Requirements of the SoftwareGeneral Requirements of the Software

Design of the Pilot ProjectDesign of the Pilot Project

GIS Users vs. EngineersGIS Users vs. Engineers

Storm Water Management Model Storm Water Management Model (SWMM) (SWMM)

SWMM was first developed in 1971SWMM was first developed in 1971

Analysis and design related to:Analysis and design related to: Stormwater runoffStormwater runoff Combined sewersCombined sewers Sanitary sewersSanitary sewers Other drainage systems in both urban and Other drainage systems in both urban and

non-urban areas. non-urban areas.

Storm Water Management Model Storm Water Management Model (SWMM)(SWMM)

SWMM tracks the quantity and quality of SWMM tracks the quantity and quality of runoff generated within each runoff generated within each subcatchment.subcatchment.

Flow rate, flow depth, and quality of water Flow rate, flow depth, and quality of water in each pipe and channel during a in each pipe and channel during a simulation period is modeled simulation period is modeled

Significant Value Added From Significant Value Added From VendorsVendors

Use the SWMM engine as a background option Use the SWMM engine as a background option for processing / calculatingfor processing / calculating

Refined for additional processing capabilitiesRefined for additional processing capabilities

Widen available input formatsWiden available input formats

Widen available output formatsWiden available output formats

Improved visualizations like…Improved visualizations like… Animations, 3D, conduit cross sectionsAnimations, 3D, conduit cross sections

Data quality control toolsData quality control tools

Bells & WhistlesBells & Whistles

General Requirements of the General Requirements of the SoftwareSoftware

Used for the analysis, design, and Used for the analysis, design, and operation of the City of Olathe wastewater operation of the City of Olathe wastewater system. system. Simulate natural rainfall-runoff processes Simulate natural rainfall-runoff processes in conjunction with the performance of the in conjunction with the performance of the collection system. collection system. This will allow City staff to better manage This will allow City staff to better manage our resources and analyze the capacity of our resources and analyze the capacity of the system for future development. the system for future development.

Requirements Evaluation ScaleRequirements Evaluation ScaleModel Functionality Model Functionality Max 35 pointsMax 35 points

Cost Cost Max 20 pointsMax 20 points

Ease of UseEase of Use Max 15 pointsMax 15 points

Data sharing Data sharing (GIS, CAD)(GIS, CAD) Max 10 pointsMax 10 points

Output qualityOutput quality Max 10 pointsMax 10 points

Pilot TestPilot Test Max 10 pointsMax 10 points

Total 100 Points

They’re only 20% of the They’re only 20% of the Evaluation…Evaluation…

Data sharing Data sharing (GIS, CAD)(GIS, CAD) Max 10 pointsMax 10 points

Pilot TestPilot Test Max 10 pointsMax 10 points

These two areas carried a large portion of These two areas carried a large portion of the weight, even though they only the weight, even though they only technically accounted for 20% of the total technically accounted for 20% of the total evaluation points.evaluation points.

Likely the case when GIS serves as the Likely the case when GIS serves as the primary data sourceprimary data source

Pilot Test DesignPilot Test Design

Personal Geodatabase containing: Personal Geodatabase containing: Subset of existing sanitary sewer systemSubset of existing sanitary sewer system Future lift stations and force main featuresFuture lift stations and force main features

DWG containing attribute information for the DWG containing attribute information for the future lift stations future lift stations A definition of the scenarios to be analyzed for A definition of the scenarios to be analyzed for the future lift stations.the future lift stations.Rainfall and sewage flow data (Excel).Rainfall and sewage flow data (Excel).Outline of the desired sewer model capabilities.Outline of the desired sewer model capabilities.Any firm that did not participate in the Pilot Test Any firm that did not participate in the Pilot Test was removed from considerationwas removed from consideration

General Pilot Test ParametersGeneral Pilot Test Parameters

Run model with most basic model parametersRun model with most basic model parameters Average daily dry-weather loadAverage daily dry-weather load

Use the minimum KDHE sanitary sewer flowUse the minimum KDHE sanitary sewer flow Wastewater daily usage patternsWastewater daily usage patterns

No ParametersNo Parameters Rainfall related flowsRainfall related flows

Use synthetic rainfall: SCS Type 2. Consider 2-, 5-, and 10-Use synthetic rainfall: SCS Type 2. Consider 2-, 5-, and 10-year storm events, 24-hour frequency.year storm events, 24-hour frequency.Assume that 0.9% of the rainfall flows into the sanitary Assume that 0.9% of the rainfall flows into the sanitary sewerssewers

CalibrationCalibrationNo ParametersNo Parameters

Changes To Pilot DataChanges To Pilot Data

Disconnected a few lines from manholes Disconnected a few lines from manholes to evaluate data quality tools of packagesto evaluate data quality tools of packagesIntentionally removed a few flowline Intentionally removed a few flowline attributes from line featuresattributes from line featuresIntentionally changed a few manhole rim Intentionally changed a few manhole rim elevationselevationsChanged flow direction of certain pipe Changed flow direction of certain pipe featuresfeaturesMade sure GIS features weren’t perfectMade sure GIS features weren’t perfect

GIS Users vs EngineersGIS Users vs Engineers

Attribute / geometry information that can be Attribute / geometry information that can be edited outside a GIS is a plusedited outside a GIS is a plus

Engineers don’t want to get modeling Engineers don’t want to get modeling information mixed up with GIS.information mixed up with GIS.

Extensions to ArcGIS were not necessarily seen Extensions to ArcGIS were not necessarily seen as a benefit.as a benefit.

Extension packages require ArcView licenseExtension packages require ArcView license

Important to know which type of user will be Important to know which type of user will be modeling the systemmodeling the system

Questions?Questions?