Bioretention Construction is the process of strategically directing and containing storm water, then properly treating it by locating native plants to absorb storm water. TSI believes in the power of sustainability and wants to help clients view storm water as an asset, not a liability. Biotention ponds are low maintenance landscape features that create an ecosystem that uses rain water to stabilize valuable soil, increase evapo-transpiration with plants, remove pollutants through soil medium, and create natural oxygenation.