Presto Geosystems Managing Stormwater
through LID & GI

This webinar aired on June 11, 2019

Speaker: Sam Justice, P.E. Design Engineer, Presto Geosystems

Today’s increasingly stringent environmental regulations continue to create the need for Low Impact Development (LID) and Green Infrastructure (GI) management on project sites. New and innovative ways must be used to limit hard surfaces such as parking lots, walkways, and emergency access lanes. Land access is at a premium, and areas of environmental protection are increasing, requiring builders and engineers to work with regulators to utilize both LID and GI practices.

Porous pavements are an easy and economical way to reduce the impervious surfaces onsite, and restore the natural water cycle close to its source. They have the added benefit of reducing the size of above ground detention ponds and conveyance and treatment infrastructure. Stormwater diversion channels, roadside swales, and drainage ditches can be constructed with low maintenance solutions, protecting against erosion and overflow concerns. Living green walls increase the amount of vegetation onsite, help promote water filtration from higher elevations, and allow access to more valuable land.

  1. Learn what Low Impact Development and Green Infrastructure means for residential and commercial project sites.
  2. Cover the regulations governing these practices and how they have been met with traditional construction methods.
  3. Learn about porous pavement options and their benefits and limitations related to infiltration, runoff reduction, traffic and performance.
  4. Understand how to manage urban stormwater through design of vegetated channels that replace hard surface systems and mitigate flooding potential.
  5. Explore different applications for low-impact products, and understand how they fit with the goals of LID and GI.

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Take the Quiz


Common applications of Green Infrastructure (GI) and Low Impact Development (LID) are:


LID and GI practices only should be used in the following applications:


True or false: Porous concrete and porous asphalt have increased lifetime maintenance due to raveling and weak bonds.


Porous parking lots can be installed in the following locations:


True or False: It is not possible to create a porous parking lot that can handle everyday use.


When can a vegetated swale be designed to resist flows up to 30 ft/sec?


True or False: Vegetated swales always have a large horizontal footprint.


True or False: You must wait several months until the vegetation is fully established before allowing water to flow through a swale or channel.


Green walls should be vegetated with the following types of plants:


True or False: Geocell walls are a good choice for areas with very soil soils due to their flexibility.

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