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In part one of this series (Is 40% a Reliable Number?), we examined new research that showed the generally accepted number of 40% porosity (also hereby referred to as “stone voids”, and “void space”) within the stone backfill as available storage might not be a reliable number. To obtain a 96% reliability in stone storage, 36% stone void storage

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Stormwater detention systems often include a large portion of the storage volume within the voids of the backfill material. Depending on the underground structure design and size, allocated storage within the stone voids can vary between 25-60% of the overall storage for the project. The generally accepted number has been 40% stone void space.

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One of my favorite summer activities is floating in the water and looking up to the sky. For some, like me, floating can be relaxing, but for others, floating brings an uneasiness. When floating, one must trust the physical force at play – a force known as buoyancy. When trying to float in the ocean, buoyancy is a good thing. In the case of an

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Many say that if it looks and quacks like a duck, then it’s probably a duck. When you visualize a biofilter, you might envision bioretention cells, rain gardens, constructed wetlands, bioswales, or vegetated filter strips. What is a visual commonality among these practices? Plants. Following the duck test, if it contains plants and engineered,

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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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