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A platform for research: civil engineering, architecture and urbanism
Multi-pump Station Basin-Level Wastewater System Model Calibration
Calibration of wastewater collection system models is essential to ensure well-functioning and representative models. However, the calibration process is usually more rigorous and time-consuming than other modelling tasks. Typically, wastewater system calibration involves examining model outputs against measured records. Next, perturbation of sensitive model parameters is necessary to accurately mimic different processes of the existing system and improve the goodness of fit between model predictions and observations. Statistical efficiency measures can guide the calibration process, ensuring good correlation within acceptable tolerance limits. The City of Napier (NCC) employs hydraulic models for long-range strategic and operational planning of its wastewater system, providing the opportunity to address operational issues and develop dynamic master plans. Recently, Stantec collaborated with NCC for the wastewater model build and calibration in which MIKE URBAN was utilized to build a multiple basin-level city-wide wastewater model. This study reviews the dry and wet weather calibration methodology. Model calibration was done in two separate stages for the dry and wet weather flow conditions. In the first stage, flow monitoring data from dry weather periods was used to set parameters such as per capita wastewater loading, diurnal pattern, and base flow for the sub-basins associated with each flow monitoring station. In the second stage, flow monitoring data collected during rainfall events was used to adjust and set hydrological settings for each group of monitored sub-basins. This model was calibrated based on pump station monitoring (PSM) records collected over the years by NCC and throughout this study, in addition to temporary in-pipe flow monitoring data collected during the 2019 winter season. The estimation of inflow and infiltration (I&I) was a critical step in the calibration process using PSM and SCADA data to examine flow trends, including the impact of seasonality and long-term response on wet weather events. Base flow enclosed the base sanitary and industrial flow and groundwater infiltration. The built model accounted for seasonal fluctuations in groundwater level, including dry weather conditions, to determine sewer trunks exceeding capacity due to groundwater infiltration, requiring rehabilitation. These efforts resulted in a good agreement between model predictions and flow records.
Multi-pump Station Basin-Level Wastewater System Model Calibration
Calibration of wastewater collection system models is essential to ensure well-functioning and representative models. However, the calibration process is usually more rigorous and time-consuming than other modelling tasks. Typically, wastewater system calibration involves examining model outputs against measured records. Next, perturbation of sensitive model parameters is necessary to accurately mimic different processes of the existing system and improve the goodness of fit between model predictions and observations. Statistical efficiency measures can guide the calibration process, ensuring good correlation within acceptable tolerance limits. The City of Napier (NCC) employs hydraulic models for long-range strategic and operational planning of its wastewater system, providing the opportunity to address operational issues and develop dynamic master plans. Recently, Stantec collaborated with NCC for the wastewater model build and calibration in which MIKE URBAN was utilized to build a multiple basin-level city-wide wastewater model. This study reviews the dry and wet weather calibration methodology. Model calibration was done in two separate stages for the dry and wet weather flow conditions. In the first stage, flow monitoring data from dry weather periods was used to set parameters such as per capita wastewater loading, diurnal pattern, and base flow for the sub-basins associated with each flow monitoring station. In the second stage, flow monitoring data collected during rainfall events was used to adjust and set hydrological settings for each group of monitored sub-basins. This model was calibrated based on pump station monitoring (PSM) records collected over the years by NCC and throughout this study, in addition to temporary in-pipe flow monitoring data collected during the 2019 winter season. The estimation of inflow and infiltration (I&I) was a critical step in the calibration process using PSM and SCADA data to examine flow trends, including the impact of seasonality and long-term response on wet weather events. Base flow enclosed the base sanitary and industrial flow and groundwater infiltration. The built model accounted for seasonal fluctuations in groundwater level, including dry weather conditions, to determine sewer trunks exceeding capacity due to groundwater infiltration, requiring rehabilitation. These efforts resulted in a good agreement between model predictions and flow records.
Multi-pump Station Basin-Level Wastewater System Model Calibration
Lecture Notes in Civil Engineering
Desjardins, Serge (editor) / Azimi, Amir Hossein (editor) / Poitras, Gérard J. (editor) / Gaafar, Mohamed (author) / Anderson, Marty (author) / Nabi, Abdul (author) / Paine, Ali (author) / Cody, Neal (author)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
2024-10-10
15 pages
Article/Chapter (Book)
Electronic Resource
English
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