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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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