It's hard to believe, but it has been almost twenty years since Filterra bioretention was introduced as a high-flow stormwater treatment system. For those that don't know, Filterra is an engineered high-flow biofiltration/bioretention system that operates similar to traditional bioretention but with high flow rates in a much smaller

If you are involved in any aspect of stormwater management, no doubt you have heard the phrase "impaired waters."  The determination and subsequent listing of a water body as impaired sets off a chain reaction of events affecting everyone who lives, works or recreates near the water body. But what is an impaired water body, and how does a water

Stormwater regulations are calling for an increased level of treatment. This often takes the form of filtration systems. Two types of filtration systems used in stormwater are media filtration and membrane filtration.Media Filtration systems function through physical capture of pollutants, as well as adsorption of pollutants through chemical

When I think about field monitoring, I often think about baseball. More specifically, I think about the knuckleball pitch. Since the knuckleball pitch has little to no spin, the ball moves in a completely unpredictable fashion. Unlike a fastball or a curveball, there are no pitching mechanics to indicate where the ball will likely wind up after

Corrugated metal pipe (CMP) is the “go-to” material for most stormwater detention and infiltration projects. A wide range of gages, corrugations, and diameters provides engineers flexibility in design not available with other materials. In addition, the industry has developed several pipe coatings and materials to accommodate site-specific

Early in my stormwater monitoring days, even though I had access to high-end automated samplers, flow meters, and data loggers, transferring said data required a manual download to a laptop with a serial cable port. Also, my colleague John and I had to print out actual maps to find the monitoring sites. Naturally, this is unthinkable today, thanks

To understand the physical and biological processes in a high-rate biofiltration system, it’s necessary to look at how each system component contributes to pollutant removal and flow management. If you are not familiar with high-rate biofiltration – check out this blog post for an in-depth explanation.MulchOften seen as just an aesthetic feature,

High-rate biofiltration differs from traditional bioretention in that it has been optimized for high volume/flow treatment and high pollutant removal. Traditional bioretention footprints with typical design flow rates of 1-12 inches per hour can occupy up to 10% of the contributing impervious drainage area. In addition, the individual components of

As previously discussed in our “Construction Cover vs. Post Construction Cover” blog post, the total cover required for a system is the combination of the pavement, measured from the bottom of flexible pavement or top of rigid pavement, the granular road base, and the backfill material. But is 12” really enough post construction cover for your CMP

If you’ve ever been confused about the cover requirements over underground detention systems, you’re not alone.  Why do the requirements change during construction vs. post-construction? Let’s break it down. What is Underground Detention System Cover?First, let’s start by defining what cover is so that we’re all on the same page. Cover is