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As stormwater quality regulations become increasingly stringent, civil engineers are turning to stormwater filtration Best Management Practices (BMPs) to meet the demand for higher pollutant removal efficiency. In this blog post, we will explore the fundamentals of stormwater filtration, focusing on pollutant removal mechanisms, sizing methods, filtration mediums, and the advantages of proprietary systems.

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Red flags are design elements that are commonly or easily overlooked and may need extra attention when designing. Considering the red flags upfront will

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The terms “high-rate biofiltration” and “runoff reduction” aren’t often used in the same sentence. The engineering community has a preconceived notion that a high-rate biofilter with an underdrain (like Filterra®) can’t provide runoff reduction benefits because the stormwater it treats moves through the practice too quickly. However, with the proper design considerations, we can maximize the capability of a high-rate biofilter to provide appreciable runoff reduction. 

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In civil engineering and stormwater management, a design storm refers to a specific rainfall event defined and described by the statistical likelihood of the event occurring in a given rainfall year. Design storms are used as a standard for designing and evaluating stormwater infrastructure. For example, local stormwater standards commonly call out the 1, 2, 5, 10, 50, and 100-year storm events and the water quality storm event for a given geography, each of which plays a role in the design and implementation of stormwater infrastructure.

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At first glance, it's easy to get excited over how much innovation has occurred in the field of stormwater management in recent years.  A wide variety of new stormwater control measures (SCMs) have been developed and deployed for use while we simultaneously worked to refine our design standards for our tried and true practices to improve their functionality. 

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