Changes

#Designing the storage to be more vertically oriented to increase available hydraulic head. BMPs should have higher side wall to bottom ratios, and a portion of the total storage regarded as effectively permanent.     

#Designing the storage to be more vertically oriented to increase available hydraulic head. BMPs should have higher side wall to bottom ratios, and a portion of the total storage regarded as effectively permanent.     

Another important element of infiltration practice design in the context of fine textured soils relates to the attraction of soil surfaces to water, which are strong in fine textured clays and silty clays and weaker in coarse textured sands or sandy loams.  This attraction, referred to as the matric potential, allows water to move up from the groundwater table into the soils.  

Another important element of infiltration practice design in the context of fine textured soils relates to the attraction of soil surfaces to water, which are strong in fine textured clays and silty clays and weaker in coarse textured sands or sandy loams.  This attraction, referred to as the matric potential, allows water to move up from the [[groundwater| water table]] into the soils. The separation between the base of the infiltrating practice and the water table should be modelled and the effect of [[Groundwater#Goundwater_mounding| groundwater mounding]] taken into consideration.

In fine textured soils, this distance can be in excess of one meter. Therefore if the base of the infiltration practice is only one meter above the seasonally high groundwater table, a direct connection between the practice and groundwater may form, bypassing the treatment properties of the soils.  It is recommended, therefore that the groundwater table be 1.5 m or lower when practices are installed on fine textured soils.

==Performance studies on fine textured soils==

==Performance studies on fine textured soils==

[[File:Infiltration_rates_studies.png|thumb|400 px|Facility wide infiltration rates for different LID practices installed in the Greater Toronto Area]]

[[File:Infiltration_rates_studies.png|thumb|400 px|Facility wide infiltration rates for different LID practices installed in the Greater Toronto Area]]

<nowiki>*</nowiki>Represents depth of sump below [[underdrain]] or [[overflow]] pipe.  In some cases, a [[flow control]] device was installed to slow outflow rates and enhance infiltration

<nowiki>*</nowiki>Represents depth of sump below [[underdrain]] or [[overflow]] pipe.  In some cases, a [[flow control]] device was installed to slow outflow rates and enhance infiltration

<references/>

<references/>

[[category:Infiltration]]

[[category:Infiltration]]

[[category:Background]]

[[category:Background]]