The Stormwater Blog 

Contech Stormwater experts discuss designing stormwater BMP’s, regulations, maintenance issues, and all things stormwater.

What is LID? Five Principles of Low Impact Development.
The Low Impact Development (LID) approach to site development and stormwater management is rapidly becoming the required design approach in many areas of the United States. The basic principle is to use nature as a model and manage rainfall at the source.
5 Hydraulic Considerations When Choosing a Stormwater Filter Media
The removal of site-specific pollutants can be maximized with the variety of filtration media available. Understanding the hydraulics of the media you choose is a key, albeit misunderstood, factor in determining the effectiveness of the filtration system. Here are five things you should consider...

An increasing challenge that we see with our customers is balancing water quality with water quantity. Conventional design would be to use an in ground detention pond. But, if this is not an option, whether the owner does not want the aesthetics of a pond, the land needs to be used for parking, or you have a layer of clay soil that makes traditional infiltration not possible, consider using a perforated CMP manhole or an infiltration well (drywell).

Innovation has become synonymous with the United States, serving as a catalyst for our economic growth and continuous improvement of our standard of living. Economics aside, if not for innovative scientific and technological breakthroughs we would be without countless apparatus, methodologies, and other discoveries that now serve as solutions to once daunting scientific and societal challenges. Faced with a growing list of water quality and other environmental quandaries, our ability to collectively innovate viable solutions has perhaps never been more crucial.
What’s Happening Inside My Tree Box Filter?
An appropriately designed and manufactured tree box filter combines the benefits of natural biofiltration with the reliable and predictable performance of an engineered system. Each tree box filter utilizes a multifaceted approach including physical, chemical and biological processes to capture, immobilize and treat harmful pollutants, while also encouraging low impact development practices by treating smaller drainage areas at the source.
Choosing a BMP - It's All About Maintenance
The task of selecting the proper stormwater BMP for your site can be tedious. There are thousands of choices; from drainage swales and silt fences to hydrodynamic separation and storm water filtration systems. All of them have their place in a well written BMP Plan, but none of them will work without maintenance.
Categories: Maintenance
Top 5 Commonly Missed Rainwater Harvesting Cistern Components
A rainwater harvesting cistern is comprised of many components. Our experience is that some of these components are often overlooked, which can negatively impact water quality. Here is our list of the top five commonly missed rainwater cistern components and why they are important .
Six Questions to Ask When Selecting a Stormwater Filter Media
During the past few years, a number of different filter media have been used for stormwater filtration. Media such as sand, peat, and compost have been used successfully. Recent uses of perlite, zeolite, carbon, and other “exotic” media have expanded the choices for targeting specific pollutants. Here are some questions you should ask when selecting the right media for your application.
What Does 80% TSS Removal Mean?
The intent of LEED Sustainable Sites Credit 6.2 is “to limit disruption and pollution of natural water flows by managing stormwater runoff,” and the requirements necessary for meeting this intent are clearly spelled out: capture 90% of the average annual rainfall and treat it by removing 80% of the total suspended solids (TSS). While the rating system does not define TSS it does recommend reliance on field monitoring data that is compliant with the Technology Acceptance Reciprocity Partnership (TARP) protocol or the Technology Acceptance Protocol-Ecology (TAPE) when screening stormwater best management practices (BMPs).
Stormwater Policy and the Triple Bottom Line – Are we doing what we need to protect water quality?
By now, you’ve probably heard of triple bottom line accounting, a full cost accounting approach considering the economic, environmental and social impacts of a decision or more poetically, the three P’s: people, planet and profit. In the stormwater infrastructure planning world, as in many other urban planning arenas, this approach is gaining popularity.
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