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Low Impact Development Case Study Project

The home construction industry in North America is progressively becoming more enlightened about the overall benefits of Low Impact Development techniques (LID), particularly where heavy rainfalls can impact significantly on land that is not well protected by natural or regenerated vegetation.
 
For instance, new subdivisions in semi-arid areas with very delicate and thin vegetation can look like a battle zone of heavy vehicle tracks. Sudden downpours can wreak havoc by carrying off not only soil in suspension but also hydrocarbons and other chemicals associated with construction. Natural regeneration can take a considerable period of time.
 
The Ridge WQ Pond
 

Problem
 
The City of Centennial, Colorado, has been growing rapidly and has found itself facing increasing challenges with regard to urban water quality, especially in flood plain zones, where, previously natural vegetation had been largely controlling runoff and providing natural filters through root systems and the sheer effect of undisturbed soil filtration.
 
City officials were well aware that LID designs, when properly implemented, could not only help replicate Nature’s runoff control solutions, but also create goodwill between residents and companies demonstrating the techniques.
 
Spray Application
 

Solution
 
Colorado Lining International is one of those LID participants and it pioneered the use, in this LID application, of Ecodur being applied to the walls of an underdrain that was added to a rain garden. The underdrain was then given an overburden of mulch and plants to act as filters and dissipaters of sudden deluges that not infrequently happen in semi-arid areas that normally result in flash flood and runoff damage.
 
Ecodur was particularly suited in a LID application as it is a non-toxic, VOC-free and solvent-free membrane that has nearly a quarter of a century of demonstrated robustness in applications such as ship decks and public garages with absolutely no chemical degradation.
 
The main ingredients of it are renewable castor oil and recyclable gypsum, a common and cheap non-toxic mineral found in many parts of the US. When exposed to flame, it just gives off water vapor and become self-extinguishing.
 
Being sprayable with rapid set-up time, it is readily applied on vertical surfaces. The fact that it is virtually odorless also makes it suitable for use near homes and domestic animals.
 
Ecodur Spray Lining
 

Application results
 
Ecodur was sprayed successfully and with its timeless ability to re-bond to itself, any future repairs, as unlikely as they are, can occur due to human induced physical damage. With its ‘natural’ profile, Ecodur’s inclusion as a major membrane used in this particular LID strategy to emulate Nature’s way of handling excessive rain run-off, was most apt.
 
The Ridge
 
To download the project details, please click here: Low Impact Development

TNphoto Tatsuya Nakagawa
Tatsuya Nakagawa is the VP of Marketing and co-founder of Castagra Products, a storage tank and wastewater coatings manufacturing company that is highly acclaimed for its cold weather tank coating applications and its durable frac tank coatings. Castagra is used by the world’s top oil and gas field services companies.