Changes

*The configuration of the outflow was also an important consideration. In systems where the outlet is elevated above the native soil, runoff reduction levels tend to be considerably higher than systems with underdrains located at the native soil interface. See [[Bioretention: Performance]]  

*The configuration of the outflow was also an important consideration. In systems where the outlet is elevated above the native soil, runoff reduction levels tend to be considerably higher than systems with underdrains located at the native soil interface. See [[Bioretention: Performance]]  

The studies, tabulated below, clearly indicate that significant volume reduction through infiltration is feasible on low permeability soils. If geotechnical investigations indicate that volume loss through infiltration is not possible, or would provide more limited benefits than found in these studies, the project should focus on reducing runoff through vegetative evapotranspiration.  See here for a list of options, and their relative potential to reduce runoff through evapotranspiration.       

The studies, tabulated below, clearly indicate that significant volume reduction through infiltration is feasible on low permeability soils. If geotechnical investigations indicate that volume loss through infiltration is not possible, or would provide more limited benefits than found in these studies, the project should focus on reducing runoff through vegetative [[evapotranspiration]].  See here for a list of options, and their relative potential to reduce runoff through evapotranspiration.       

{|class= "wikitable sortable"

{|class= "wikitable sortable"