The Stormwater Blog 

Contech Stormwater experts discussing Low Impact Development, Onsite Water Management, Rainwater Harvesting and all things Stormwater.


Detention


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Risers and Cleanouts – The Tip of the Iceberg
If you’ve ever walked down a city street and stepped over at manhole with the label “STORMWATER” nestled in the pavement, chances are you’ve skimmed the surface of a detention system. If you were to lift up that manhole lid and peer down into its’ depths, you might be surprised to find a whole underground network of pipes and products designed to prevent flooding and treat stormwater.
6 Corrugated Metal Pipe Detention Design Questions

For the majority of applications, corrugated metal pipe (CMP) is the “go to” material for subsurface infiltration. This in turn, leads to a lot of design questions. Below is a list of six questions and answers we received from a recent webinar on designing CMP detention systems.

Categories: Detention
Designing CMP Detention Systems Part Three – Design Red Flags
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 performance issues.
Designing CMP Detention Systems: Part Two – Cost Effective Design and Layout

The goal of any CMP detention system should be to maximize the vertical space available to minimize the overall footprint, to reduce material, excavation, and backfill costs. To do this we recommend using the largest diameter pipe possible.

Designing CMP Detention Systems: Part One – The Value of Going Underground
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.
Filter Fabric in Detention and Infiltration Systems

It’s never surprising to see some type of fabric or geotextile called-out around an underground detention or infiltration system. The note is common across civil plans everywhere, but how is a geotextile selected as applicable for the particular underground system the detail was so aptly created? The answer to that question starts with one step back – why we even use filter fabric.

Bioretention Part One: Lessons Being Learned

As bioretention becomes more popular, many types of designs are being deployed throughout the U.S.  Though relatively simple in concept, many are finding that the devil is in the details with respect to maintenance and performance.  These issues are driving newer designs and improving criteria for use. Over my next few posts, I will be sharing some of the experiences and lessons learned with bioretention design. 

 

Is Corrugated Metal Pipe Suitable for Subsurface Infiltration?
Some engineers are hesitant to use CMP (corrugated metal pipe) for stormwater applications because they have read or heard about CMP being used in culverts that have corroded. This shouldn’t be the case. Many decades ago, galvanized pipe was the coating of choice for culverts; that now has been replaced with Aluminized Type 2 (ALT2). 
Why Pretreat Your Stormwater Infiltration System?
Hands down, the most important factor in the sustainability of any infiltration system is proper maintenance. By their very nature, infiltration systems are difficult to inspect and maintain. The selection of a cost-effective and easy-to-access treatment system can mean a huge difference in maintenance expenses for years to come.
Thinking Outside The Box: Infiltration System Layouts
Historically, underground infiltration beds have been laid out in either square or rectangular shapes, sometimes far away from where the actual rain drops fall. These large systems are typically fed by a series of upstream catch basins and conveyance pipes. Several factors contribute to site layout, but mostly it simplifies the hydrologic and hydraulic modeling process, and keeps infiltration beds away from more sensitive underground infrastructure.
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