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Contech has published several blog posts that refer to corrugated metal pipe (CMP) for underground storage of stormwater. We were a bit surprised when some engineers challenged our use of the word detention. Two different engineers commented on LinkedIn that the proper term to use was retention, not detention. Based on these comments, we thought it

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Nearly twenty years ago, when I was cutting my teeth in a stormwater research and development laboratory, the debate over the most appropriate method to measure the solids concentration in stormwater samples was front and center.  The great total suspended solids (TSS) vs. suspended sediment concentration (SSC) deliberation.  Compounding the

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Whether you are involved with the design, installation or the manufacture of stormwater BMP’s, the key ingredient to a successful project is communication.  Poor communication, or worse, no communication, can be a project's downfall. The best way to ensure excellent project communication is to have a pre-construction meeting.But why have a

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Corrugated Metal Pipe (CMP) is the construction material of choice for underground stormwater detention and infiltration projects. With its low cost, a wide variety of pipe diameters up to 144”, layout configurations and pipe coatings, CMP offers engineers the flexibility to develop solutions that can be sized and shaped to meet site-specific

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In the nearly 20 years that I’ve spent immersed in stormwater management matters (I’ve only actually gone in a couple of times), I’ve pondered many head-scratchers.  The proliferation of flawed policies, poor assumptions, questionable data and lack of enforcement have all been commonplace.  However, I have always been comforted by the fact that we

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Media-based stormwater filtration systems are much more flexible in their design than their rigid, precast concrete structure would suggest. A brief look inside that durable housing identifies several design options these systems offer to further reinforce their flexibility.  Flexibility to treat site-specific pollutantsJust as each site differs in

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In last month’s blog post, we took a look at the Point on a Curve sizing methodology. In this month’s post, we will look at the other common HDS sizing methodology: the Net Annual sizing method. As a reminder, proper sizing should start by checking local regulations.The Net Annual method is used to determine an HDS system’s pollutant removal

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Proper sizing of hydrodynamic separators (HDS) should start with checking applicable regulations. In many cases, local or state regulations will dictate how to size an HDS system and even provide a list of what products are approved for use.  If there are no regulatory requirements, the engineer must identify which pollutant(s) need to be removed

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As a biofiltration surface layer, mulch can support water retention, weed suppression, organic replenishment, pollutant treatment, aesthetics, media protection from scour, and moderate media temperature. Landscape mulches can include organic mulches like fresh wood chips or aged composted mulch, as well as inorganic mulches such as rock and rubber

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Installing a Stormwater BMP is an important step towards protecting our waterways, but for them to perform as designed, they must be maintained regularly. Where do we dispose of the material removed from catch basins and stormwater treatment systems after maintenance?  I get that question regularly from both private and municipal maintenance

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