Changes

Bioretention can be constructed over any soil type, but hydrologic soil group A and B are best for achieving water balance objectives. Facilities designed to infiltrate water should be located on portions of the site with the highest infiltration rates. For infiltration rates <15 mm/h an underdrain is recommended. Native soil infiltration rate at the proposed location and depth should be confirmed through in-situ measurements of hydraulic conductivity under field saturated conditions.

Bioretention can be constructed over any soil type, but hydrologic soil group A and B are best for achieving water balance objectives. Facilities designed to infiltrate water should be located on portions of the site with the highest infiltration rates. For infiltration rates <15 mm/h an underdrain is recommended. Native soil infiltration rate at the proposed location and depth should be confirmed through in-situ measurements of hydraulic conductivity under field saturated conditions.

===Wellhead Protection===

===Wellhead Protection===

Facilities receiving road or parking lot runoff should not be located within 2 yr time-of-travel Wellhead Protection Area (refer to drinking water source protection plan).

Facilities receiving road or parking lot runoff should not be located within 2 yr time-of-travel Wellhead Protection Area (refer to applicable drinking water source protection plan).

 

===Available Space===  

===Available Space===  

*Reserve open space equal to roughly 10 to 20% the size of the contributing drainage area.

*Reserve open space equal to roughly 10 to 20% the size of the contributing drainage area.