Changes

*Infiltration rates on silty clay, clayey silt and sandy silt textured soils had a median value of 3.3 mm/h and a range between 0.3 and 17.8 mm/h.  

*Infiltration rates on silty clay, clayey silt and sandy silt textured soils had a median value of 3.3 mm/h and a range between 0.3 and 17.8 mm/h.  

*Permeable pavements had lower measured rates, in part due to compaction of the subsoils to accommodate traffic loading.

*Permeable pavements had lower measured rates, in part due to compaction of the subsoils to accommodate traffic loading.

*Stormwater runoff volume reductions varied between sites, primarily due to factors other than the native soil infiltration rate. For instance, the infiltration trenches and chambers had similar native soil infiltration rates (3.1 to 5.1 mm/h), but runoff reduction values varying from 16 to 90%. This is attributed to differences in the I:P ratio, which ranged from 10:1 to 155:1.   

*Stormwater runoff volume reductions varied between sites, primarily due to factors other than the native soil infiltration rate. For instance, the infiltration trenches and chambers had similar native soil infiltration rates (3.1 to 5.1 mm/h), but runoff reduction values varying from 16 to 90%. This is attributed to differences in the I/P ratio, which ranged from 10:1 to 155:1.   

*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]]