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Challenge
The firm needed a modeling application that could accommodate the complex flow of an airport de-icing & stormwater collection system.

Solution
StormNET enables the firm to model pumps and valves critical to the project, as well as automates a number of steps.

Results
Fewer steps and less time to evaluate a collection system and recommend improvements that contribute to airport safety and protects the local environment.

As Jacobs Carter Burgess engineers prepared to begin the project, they realized that their existing stormwater modeling applications lacked the capabilities required to model critical aspects of the SADF/stormwater system. The team turned to StormNET by BOSS International, which offered that essential modeling functionality.

"We chose StormNET because it has the ability to model pumps and create control rules for valves and orifices, which our other modeling applications could not handle," said Jerrod Melander, Engineer. "We were also looking for a more user-friendly application." The fully-dynamic hydrology and hydraulic model analyzes both simple and complex stormwater systems using a variety of hydrology methods and models, including water quality.

An engineer from BOSS International assisted Jacobs Carter Burgess in the initial setup and training for StormNET. He demonstrated how to define control rules for opening/closing valves and operating pumps, and network elements specific to the airport project. "Assistance from BOSS in setting up the model saved probably two weeks of work for us," Melander said.

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" It's saving quite a bit of time on day-to-day modeling. "
       — Jerrod Melander, P.E., Project Engineer, Jacobs Carter Burgess

After initial setup, Melander and Eric Hahn, another engineer at Carter Burgess, were able to work on different parts of the DFW stormwater project, and then later merge the two separate models into one. This allowed them to work independently on the same project, speeding up the completion of the project.

As engineers added, changed and moved network elements, StormNET automatically updated the model by moving any connected pipes or pumps. They were also able to import AutoCAD® and ArcGIS® data and network components directly into StormNET, saving time in building the model.

StormNET allowed Carter Burgess to model the airport system to collect SADF, mixed with stormwater, during combined rain and aircraft deicing events. The stormwater modeling was specifically for pavement drainage at 14 deicing pad sites.

The model took into account all elements of the airport project's complex flow structures, including storage/treatment units, flow diversion structures, pumps and valves. Engineers apply their own user-defined dynamic control rules to simulate the operation of pumps and control valves. "The biggest benefit for us is the ability to model force mains and pump or lift stations, which is very critical to the project," Melander said.

With StormNET, Jacobs Carter Burgess engineers used the latest NRCS (SCS) TR-20 analysis model for the project's SADF collection system. StormNET allows them to select from pre-defined dimensionless unit hydrograph peak rate factors or assign user-defined unit hydrographs to match the airport's hydrology.

As the airport monitors its flow meters during actual stormwater and de-icing events, Jacobs Carter Burgess can further calibrate the model using StormNET. The calibrated model can then be used to project runoff volumes for design storms, helping the engineers improve the stormwater and SADF collection system to more adequately handle runoff.

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StormNET helps Jacobs Carter Burgess take some of the complexity out of the complex analysis and design for the DFW airport project. With StormNET, engineers automate some of the manual steps typically involved in modeling, allowing them to arrive at viable designs more quickly. "It's saving quite a bit of time on day-to-day modeling," Melander said.

With the ability to export detailed model information to Excel, and produce graphical representations, Jacobs Carter Burgess can analyze the system more easily, as well as present results and improvements to airport management.

The end result: A SADF collection system that contributes to safety at one of the world's busiest airports while protecting the local environment.

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