Changes

===Water Balance===

===Water Balance===

Bioretention practices have been shown to reduce runoff volume through both means of evapotranspiration and infiltration. The primary body of research is separated into bioretention practices either with underdrains and those without (therefore, relying solely on full infiltration into underlying soils). Volumetric performance improves when:   

Bioretention practices have been shown to reduce runoff volume through both means of evapotranspiration and infiltration. The primary body of research is separated into bioretention practices either with underdrains and those without (therefore, relying solely on full infiltration into underlying soils). Volumetric performance improves when:   

* Native soils have high infiltration capacity.

* Native soils have high infiltration capacity;

* Underdrain is elevated above the native soil and/or a flow restrictor is installed on the underdrain.

* Underdrain is elevated in the underdrain cross-section above the bottom of the practice;

* A flow restrictor (e.g., orifice, valve) is installed on the underdrain or storm sewer outlet pipe.

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