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The question of whether a hydrodynamic separator should be online vs. offline is something that engineers and stormwater treatment manufacturers deal with on a daily basis.  Online systems allow storm events that are greater than the design storm to be bypassed through the treatment unit, eliminating the need for a separate bypass structure.  This

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In our third and final part of our blog series we will look at design red flags for CMP detention systems. Red flags are design elements that are commonly or easily overlooked and may need extra attention when designing. Considering the red flags upfront will expedite the design and fabrication process, and eliminate delays, installation, and

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In part one of this three part series we looked at the value of underground detention systems. In part two, we will provide insight in designing efficient and cost effective systems.Regarding minimizing costs, the three most importing goals should be to shrink the footprint of the system by maximizing the storage volume within a given area,

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The two essential functions of a stormwater management system are to control the quality and quantity of runoff leaving a site. There are various ways to do this; a common method is with an above ground system in the form of a detention pond.The problem with ponds is that they take up usable land space therefore not allowing one to maximize their

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With the passage of time and the placement of stormwater treatment facilities into service in urbanized areas, it’s been possible to observe how these facilities age. All too often, the majority of effort and focus is placed upon the design and construction of stormwater treatment facilities, which are often neglected or forgotten once construction

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Current stormwater design guidance typically recommends starting with preservation of the natural landscape and hydrology wherever feasible. But, even with preservation, new stormwater management facilities are likely to be required to capture and clean runoff from pollution generating surfaces. These new stormwater facilities are likely to include

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EPA selected a removal standard of 80% total suspended solids (TSS) removal as the target pollutant of concern due to high TSS concentrations ubiquitous impact on water quality and degradation to aquatic habitat. Many other pollutants of concern are particle-bound, and TSS is thereby a surrogate for other pollutants. Testing methodologies for

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The EPA selected a removal standard of 80% total suspended solids (TSS) removal as the target pollutant of concern due to high TSS concentrations impact on water quality and degradation to aquatic habitat. Many other pollutants of concern are particle-bound, and TSS is thereby a surrogate for other pollutants. Testing methodologies for stormwater

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Rainwater harvesting (RWH) stores rainwater for reuse to supply non-potable uses like irrigation, wash water, toilet flushing, and laundry.  During long dry periods the demand will drain the storage cistern down to a critical level where the pressurization pump(s) will need to shut down to prevent dry run damage.  Make up water is typically a

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As mentioned in Part One of this blog post series, a successful bioretention media installation must have a framework in place as guidance for managing media from inception to installation. The framework should not only include Standard Operating Procedures (SOPs) or how to source, qualify, verify, produce, store, and handle media, but also include

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