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Hydrodynamic Separators Improve Low Impact Development Practices

6/18/2015

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The Hydrodynamic Separator is like a trusted Ford pickup, reliable and easy to maintain. Like a dependable Ford, the Hydrodynamic Separator (HDS) might seem a bit dull next to the shiny new low impact development (LID) practices, but in reality, this equipment is essential to a well-rounded LID plan.

LID practices have dramatically expanded. They focus on landscape-based and water retention designs that reduce runoff volume and mimic predevelopment hydrology to meet goals of runoff reduction and water quality treatment close to the runoff source. Plus regulations often reward developers for infiltration and/or rainwater harvesting. Regulatory agencies also recognize the added value of HDS for upstream protection of sensitive LID practices. Too often HDS has been relegated to traditional, end-of-pipe solutions. Not so fast! Hydrodynamic separators play an important role in developing a treatment train that is essential to the long-term success of LID practices, including infiltration, harvesting, bioretention and storage.

At first a combined approach using HDS can seem counterintuitive to LID, it’s actually a comprehensive, long-term solution that can address problems before they start. Over time, this treatment train approach can reduce the long-term harmful buildup of particles, dirt and trash within LID facilities. For example, one Chattanooga, Tennessee customer embraced this idea and used an HDS to pretreat runoff for an underground rainwater harvesting structure used for surface infiltration landscaping irrigation, toilet flushing, and even a decorative fountain on top of both structures.

As you can see from this example, the best of both a traditional and progressive approach can improve aesthetics, reduce maintenance time and costs for the facility, increase the entire system lifecycle, all the while enhancing property equity to maximize land use from that of a conventional stormwater management approach. 

LIDstormwatermanagement
HDS and LID work together on this Tennessee project to achieve visually appealing green space and smart stormwater management.
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First Bahrain Project Using Aqua-Swirl Opens to the Public

4/29/2015

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The first Aqua-Swirl in Bahrain was installed in the parking lot of the now iconic Four Seasons Hotel.  Bahrain Bay is the Kingdom of Bahrain’s first master planned mixed-use waterfront community, situated off the northeast coast of the capital Manama. The $2.5 billion development has a masterplan designed to create a fusion of residential, commercial, retail, tourism, and community facilities and public amenities.

The engineering wonder is built on a reclaimed island in the center of Bahrain Bay.

The project included two Aqua-Swirl AS-6s to return clean water to the bay and reduce flooding. Though rainfall is scarce, large amounts of rain tend to fall at once, creating runoff and often flooding. Having a solution that allows for high water flows was essential. The Aqua-Swirl treats flows up to 178L/s.

“Service is extremely important for this client, so ensuring that runoff doesn’t collect on the car lots was a high priority. No one wants cars flooded at this high-rise,” said Sellam Hmadouch, Aqua-Shield’s Middle-East representative.  

Check out the awesome photos of this engineering feat below. 

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Mount Vernon Addresses Flooding Issues with Stormwater Management

3/23/2015

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Check out this article about flood management in Mount Vernon that was recently published in Storm Water Solutions.

Located along the banks of the Skagit River 60 miles north of Seattle is the City of Mount Vernon, Wash. This community, which is known for its annual Tulip Festival street fair, has been plagued by immense flooding. The devastating effects of this flooding have limited the city’s ability to promote its unique tourist opportunities.

In order to alleviate the flooding issue, the city developed a multi-year plan that included the purchase of a mobile floodwall that could be installed during events. This was utilized as a stopgap measure while designers worked on developing a more permanent fix. The long-term solution decided upon was the $27.3 million Private-Public Partnership Waterfront Revitalization Plan, which was broken down into multiple phases.


Read the whole case study in Storm Water Management. 


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AquaShield Presents Low Impact Development Practices at Chattanooga Engineers Club

3/17/2015

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One of the leading topics in stormwater management today is the drive for sustainability, green infrastructure designs and Low Impact Development (LID) practices.

Mark Miller, research scientist for AquaShield, Inc., presented trends in LID and changing stormwater regulations in Chattanooga at the Engineers Club. Mark offered an overview of the topics and discussed the movement toward water catchment versus end of pipe solutions.

Key takeaways included:

  • Storage is important, but pretreatment is the first key to the success of a storage based LID plan
  • When picking an LID plan, consider the benefits of each. Pick the best possible solution for the problem at hand based on your goals. 
  • Maintenance is essential and must be considered on the front end. Poor upkeep can subtract from the benefits of a progressive LID plan.
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  • Biofiltration helps groundwater recharge and reduces the heat island effect.

There is no single solution for stormwater management. This makes multiple technologies needed to solve problems. Solutions can include, media filtration, surface and subsurface infiltration, treatment and storage, rain harvesting, drivable grass and many more.

Would you like to view the presentation? 
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Low Impact Design Tool Makes Product Selection Easy

2/3/2015

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Water specialists and engineers are increasingly focused on low impact development (LID) technology and stormwater solutions that reduce runoff and provide water quality treatment. At AquaShield™ we developed an LID  pyramid to help our clients and engineers select the solution that is best for their stormwater project. 


  1. Begin with subsurface infiltration as the most preferred design option to reduce runoff
  2. Consider subsurface infiltration
  3. Look for rainwater harvesting
  4. Biofiltration designs spanning both aspects of runoff reduction and water treatment
  5. Conventional designs including a variety of treatment train options for both water quality and quantity designs
Low Impact Design Pyramid for Storwater Treatment Selection
Check out a full explanation of each step in our Tech Report. 

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Congrats to the LID Design Challenge Winners

7/29/2014

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Resource: Rain Logo Low Impact Development Design Challenge
Resource Rain Chattanooga recently launched the Low Impact Development Design Challenge, sponsored in part by AquaShield. The contest asked teams to redesign Broad Street and Cherokee Boulevard with green space, bike paths, and LID elements. 


You can check out all their cool ideas for improving our home city of Chattanooga here: http://www.greenspaceschattanooga.org/lid-competition/

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AquaShield, a Komline Company 
2733 Kanasita Drive, Suite 111
​Chattanooga, TN 37343
​Toll Free: 888.344.9044 | Phone: 423.870.8888
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