Hydraulic Analysis and Modeling

Models can predict pressures, identify bottlenecks, and demonstrate the effectiveness of proposed solutions. Testing different alternatives that use the existing system to full advantage allows us to minimize the cost of improvements.

Surge analysis enhances pump station and pipe design by identifying surge protection strategies to prevent equipment damage. Reducing surges often also plays an important role in odor control.

Surge modeling indicated that a hydropneumatic surge tank (bladder-style) would be required on the Abingdon Water Treatment Plant site to avoid both detrimental high and low pressure surges in the distribution system.

In this Disinfection/Disinfectant By-Products Study, we used a hydraulic model to determine the water age in the system for several optimization scenarios, as well as existing conditions. The best combination of scenarios was then selected to afford the greatest overall reduction in water age (and DBP formation) throughout the NYC distribution system.

Computational Fluid Dynamics is a design tool that performs economical and detailed analyses of fluid flow. This model analyzed chlorine contact time to optimize disinfection.

This image is of a light-intensity model, which predicts the intensity of the UV lamps relative to distance from the lamp. The combined effect of the numerous lamps is accounted for in the model.

This image shows combined output of light-intensity and fluid-flow models. Particles are tracked through the UV reactor to calculate the total fluence rate (dose) applied to a particle. Model results closely matched actual field-test data, proving that this combination of models provides an effective means of validating both large and small-scale reactors.

For the Kingsport, Tennessee, water distribution system, we're using a recently calibrated WaterGEMS hydraulic model to identify low pressure issues, water age issues, and potential fire flow issues.

Hydraulic models illustrate the effects of changing demand and climactic conditions on water distribution and wastewater collection systems – predicting pressures and identifying bottlenecks – and demonstrate the effectiveness of proposed solutions. By testing different alternatives and using the existing system to full advantage, models help utilities minimize the cost of improvements.

We regularly apply our modeling capabilities to evaluating many types of engineered and natural systems, including sanitary collection systems, storm sewer networks, natural channels and coastal zones, stormwater management BMPs, drinking water aqueducts, reservoir watersheds, and treatment plants of all sizes.

Most often, we employ hydraulic surge analysis, computational fluid dynamics (CFD), sewer system modeling, and water quality modeling to help municipalities:

• create water and sewer master plans
• meet EPA regulatory requirements
• eliminate combined sewer overflows (CSO)
• identify methods to improve water quality

Practical experience tying models to the real world is what sets us apart. Our modelers specialize in integrating GIS with models using any commercially available software package, and work closely with field engineers, operators, and designers to bridge the gap between models and reality.

We can help you eliminate:

• Low water pressure
• Overloaded pipes
• Poor turnover in tanks
• Excessive water age
• Closed valves
• Short circuiting in tanks
• Pressure surges
• Sewer overflows

Modeling tools enable planning for potential changes in precipitation, increases in sea level and risk from storm surge on infrastructure. In addition to the existing statistical record typically used to size infrastructure for water quality benefits and flood control, Hazen and Sawyer helps clients stay abreast of the most up-to-date research on climate change, and makes use of these forecasts in sustainable long-term planning. Our suite of modeling programs, which include the InfoWorks series by Wallingford Software and the U.S. Army Corps of Engineers’ HEC models, can help control risks associated with climate change. Regardless of the effects of climate change, our modeling expertise produces designs that minimize the impacts of development and infrastructure on the water environment.

Cutting edge hydraulic modeling capabilities allow Hazen and Sawyer to better understand the behavior of the systems we design and improve their long-term performance, a key to successful and sustainable water engineering.

For inquiries contact:
Michael Wang