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Development of Hydraulic Simulation Model for Shanghai Sewerage Project

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In the Second Shanghai Sewerage Project, the municipal wastewater collected from the city central areas is transported over 40 km (25 miles) to a pre-treatment plant in east of Shanghai. Chiang, Patel & Yerby, Inc., (CP&Y), provided engineering services in the development of a hydraulic simulation model as the application software for the project. The InfoWorksTM CS hydraulic modeling software by Wallingford Software, Inc. (WSI) was used as the platform to establish the hydraulic model. A working hydraulic network was first developed with available data and proper assumptions. The model includes all key elements of this sewage conveyance system, such as gravity sewers and manholes, surcharged force mains, river inverted siphons, valves and gates, and pump stations. Three main lift stations were modeled for multiple-pump operation using actual pump head-capacity curves and wet well “on/off” level switches. The state-of-art real time control (RTC) module was also developed to simulate pump station operation using variable speed pumps. This working model was then hydraulically calibrated segment by segment using real operating data collected from SCADA system. A two-step calibration method including initial adjustment and later verifications was used in calibration efforts. After calibration, the predicted water depths closely match the observed values in all data periods selected for model calibration. Finally, the calibrated model was further verified in dynamic simulations by comparing simulation results with real operating data. The verification results indicate that the model simulates the actual system operation quite well. The observations in this project prove that the calibrated model can properly predict the operation for this large-scale sewage conveyance system. After a proper customer training program, this useful tool is ready for use by operators to develop control strategies for optimizing operations. It can also be used for preparing alternatives for future system expansion.

Document Type: Research Article


Publication date: 2003-01-01

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