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HYDRA® software is very strong in the area of I/I modeling, offering a variety of modeling methods from simple to sophisticated. Its unique Defect Database method offers innovative tools to help the user realistically simulate infiltration, inflow, and interflow. Because of these unique and powerful features, HYDRA® software is the first choice of many I/I experts.
Traditional Methods
The simplest approach to modeling infiltration and inflow is the traditional approach.
You can input assumption-based daily volumes for infiltration globally, by sub-basin or lateral, or for individual pipes.
The volumes may be calculated from population, area, pipe-length, or pipe diameter to produce a steady flow infiltration hydrograph.
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Sanitary Plus Steady Infiltration |
HYDRA's Defects Database
For more sophisticated I/I modeling, HYDRA Software includes the unique Defects Database.
This approach uses data on the condition of pipes and manholes to match metered flow from actual storm events.
Hydra's unique ability to track each type of flow separately (sanitary, groundwater infiltration, rainfall-derived infiltration, stormwater inflow),
so you can easily see what data source needs to be adjusted to match metered flows.
Defects Flow File |
Defects Dialog Box |
Each type of flow is tracked separately. |
Rehabilitation Planning
Once you have a calibrated model using the Defects Database, you can use the powerful features of
HYDRA® software to help you determine the most effective plan to restore system capacity lost to infiltration and inflow. You can model different pipeline rehabilitation scenarios to determine the impact on overall flows.
It can model system repair criteria:
- Repair priority: See how much capacity is restored if you only fix high priority system defects.
- Expected repair date: See where flows will be at a certain point in time if repairs are done according to your rehabilitation plan.
- Effectiveness of repair: Model different types of repair with levels of expected effectiveness (e.g. 70%).
By using all the powerful features to model repair scenarios, you can determine the cost of reducing I/I, and the overall impact your repairs will have to restore system capacity. The types of repairs you can model include:
- Use of trenchless technology, pipe lining, to reduce leaks in aging pipelines caused by root intrusion, cracks, etc.
- Program to eliminate roof drain connections, leaking or missing manhole lids, or other direct connections.
- Pipe replacement
- Manhole and joint repair
For indepth reading, check out Chapter 6 "Modeling Infiltration and Inflow" of the Hydra User's Manual.
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