Which of the following techniques is used in Low Impact Development to manage stormwater?

Amended soil is a key technique used in Low Impact Development (LID) for managing stormwater effectively. This method involves enhancing the natural soil properties to improve infiltration, drainage, and pollutant removal. By incorporating organic matter or other amendments to the soil, it increases porosity and enhances microbial activity, which contributes to better water absorption and filtration.

Using amended soil in landscaping and urban environments allows for greater water absorption during rain events, reducing runoff and minimizing the risk of flooding. It also helps to replenish groundwater supplies, supports vegetation growth, and improves overall soil health, which are all critical components of sustainable landscape design.

In contrast, the other techniques listed do not align with the principles of LID. For example, landfills often lead to environmental issues rather than solutions, concrete channels can exacerbate stormwater runoff and pollution, and traditional stormwater systems typically focus on conveying water away rather than managing it in a sustainable way. Thus, amended soil stands out as an effective and environmentally friendly approach within the framework of Low Impact Development.