The SewerSIMs can accurately simulate:
- Free surface, surcharge flows and back- water effects
- Gradually varied flow in pipes and rapidly changing flow
in control structures
- Hydraulics of looped networks
A sewer Hydrology/Hydraulic model and a well-trained user team could be a very powerful tool to accomplish following objectives as:
Simulations for Design Evaluation
SewerSIMs can be used by modeling engineers to simulate:
- Combined sewer overflows (CSO)
- Sanitary sewer overflows (SSO) together with storage
junctions
- Open and closed conduit flow and impact of new site
developments
Therefore, the advanced computer modeling technology is able to scientifically answer questions posed by decision-makers and engineers, such as:
- What are the return periods for overloading of various
parts of the existing sewer system?
- What is the major reason of overloading (backwater,
insufficient pipe capacity, insufficient hydraulic control structures or operational problems, etc.)?
- What is the impact or cost effectiveness of replacing
critical sewers, installing new detention ponds, outfall structures, etc?
A well-established modeling system can be further applied to predict both short and long-term environmental impacts affected by changing operational policies. The SewerSIMs model can be employed at any stage within a sewer project’s development cycle, from the planning area, to the design stage, and onward into system operations and maintenance. In addition, through adding other program components, a SewerSIMs model system can be expanded to become a complete sewer information management and control system.
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Simulations for Operation Strategies
The model simulations could be carried out to develop operational strategies for pumping stations for power saving, flooding and CSO control. For example, in some area of Shanghai, sewer overflow occasionally occurs under the dry weather flow condition while the usage of capacity of main sewer conveyors is less than 50%. The SeweSIMs was used to examine the impact of static and reactive control strategies on the behavior and performance of the existing sewer network. The optimized control strategies were developed for the SMSC staff and Engineers and the dry weather sewer overflows were eliminated through using those optimized operational rules.
Optimization for Hydraulic Structures Upgrade
To effectively use the storage in the system needs two conditions:
- Enough control structures in the system to “hold” or
“release” the flow under certain conditions
- Optimized operational strategies to store more water
without increasing the risk of flooding
For a large and complex sewerage and drainage system, it is possible that during a storm, flooding or CSO’s occur in the service area of the main sewer conveyors while in some portions of the system conveyors or collection pipes are empty. Using SewerSIMs, the modeling results for the existing sewer and drainage system could be analyzed to identify the drainage area lack of enough control ability.
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Project Delivery The major advantage of a sewer modeling project is not only to present a project report but also provide the project owner the sewer hydraulic and hydrology model package together with an established hydraulic/hydrology model system jointly with solutions for flooding and CSO control. The model system could be further used by owner’s team to timely evaluate a system retrofit alternative with limited effort.
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