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.
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We are pleased to announce that AquaShield will be presenting at StormCon 2015 in Austin! If you haven’t signed up yet, it’s not too late. There are also special student rates. You can register at http://www.stormcon.com/registration.html.
The AquaShield presentation will explore the predictive performance scaling method for hydrodynamic separators using the Peclet number. A documented hydrodynamic separator performance curve is used as an example to generate a series of predicted performance curves for the same device for median (d50) particle sizes ranging from 45 to 125 microns. Sizing charts are also generated from the predicted performance curves using this Peclet number approach. This method also allows for reasonable comparisons between different laboratory testing programs when different influent particle size distributions were used.
The critical role of particle size in performance testing becomes even more evident when regulatory design guidelines lack a particle size specification for system sizing criteria. In those cases, the real potential to undersize or oversize facilities can lead to a variety of implementation, performance and long-term functionality concerns.
We won’t give away everything! Attend our presentation to get all the information.
Check out this in-depth article about changes coming to stormwater management in California. Under the new rules, there is no one-size-fits-all. Instead, industries, municipalities, and businesses large and small will have to meet a variety of rules. Regardless, they all need to be thinking about how to plan for stormwater management.
By July 1, 2015, industrial facilities throughout California must come into compliance with a new version of the Clean Water Act general permit governing storm water discharges. The new Industrial General Permit is the first revision of that permit in 18 years. In contrast to the old permit’s comparatively permissive standards, the new permit imposes mandatory best management practices, increased sampling requirements, and significantly increased reporting obligations—all of which must be posted to the state’s online database and therefore be made available to the public.
Read the whole article by Facility Executive here: http://facilityexecutive.com/2015/05/st/
Additional regulation means even more need for products and best practices with a proven record of success, confirmed by third parties. You can reach out to our experienced staff at email@example.com to schedule a California specific stormwater management consultation.
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