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Track: Water Distribution, Wastewater, Sewer
Brian Kubaska
Massachusetts Water Resources Authority (MWRA)
100 First Avenue
Charlestown Navy Yard
Boston, MA 02129
Telephone: 617-242-0230
Fax: 617-241-6500
Wei Du, Daisha Wescott
GIS Schematic Development and Database Interface for Greater Boston Sewer System Model
Defining Issue: Under a recent project the MWRA's consultant developed a sewer system model that included approximately 3,000 junctions and conduits that received flows from over 1,200 tributary areas. The modeled system included a complex combined and sanitary sewer network with multiple loops and interconnections. Although modeling schematics were developed that were sufficient for the project needs, to support long-term modeling efforts and to provide a link between the model and existing MWRA GIS coverages and databases, the MWRA required enhancements to the schematics including repositioning modeled junctions and conduits in their geographically correct locations, adding annotation to define where tributary areas enter the modeled system, structuring the schematic attribute data to enable cross-referencing of existing databases, and updating existing condition schematics to reflect current system configuration. In order to meet budget limitations, an intelligent use of advanced GIS data models that
used available information would be required. GIS Solution: Based on the five years of experience in modeling sewer systems and providing GIS support to the MWRA modeling efforts, Harvard Design and Mapping (HDM) has developed a comprehensive model schematic editing and viewing tool (MST) to automate the development of geographically correct model schematics. The MST allows the user to integrate data from the sewer model (EPA SWMM EXTRAN model) input files with existing MWRA GIS sewer layers, such that modeling schematics could be developed. The MST also provides users with the capability to easily edit modeling schematics and view and query modeling schematic coverages, attribute data, the EPA SWMM EXTRAN and RUNOFF input data, and present sewer system simulation results. Methodology: The MWRA has taken on the responsibility of maintaining an up-to-date model of its sewerage collection system. The model is currently used by MWRA staff to answer hydraulic questions about sewer system flows and
capacities and to evaluate relief alternative to solve system deficiency problems. The MST and modeling schematic coverages developed will enable the MWRA to more efficiently maintain the SWMM EXTRAN model, visualize the correlation between the model and the physical sewer system, graphically present modeling results, view the relationship between model input and system database, view model input and output used to represent the system, and link the sewer model and schematic layer to other existing databases. A number of different methodologies were used to develop the sewer model schematics for the project, and the MST is the most cost-effective way to support the environmental modeling efforts. Software: MST is an application of ArcInfo, written by AML. The advanced network analysis from ArcInfo and the network data model were used in the application.
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