Changes

[[Overflow|Overflows]] are features of inline facilities and convey larger storm events out of the LID feature.

[[Overflow|Overflows]] are features of inline facilities and convey larger storm events out of the LID feature.<br>

Construction Steps:

Construction Steps:<br>

#Connect the overflow drain to the underdrain   

#Connect the overflow drain to the underdrain   

#Install overflow pit to grade at the location specified in the contract documents

#Install overflow pit to grade at the location specified in the contract documents

#Fit a metal, domed grate to the overflow

#Fit a metal, domed grate to the overflow<br>

Key Inspection Points:

Key Inspection Points:<br>

*Overflow drain matches design specifications

*Overflow drain matches design specifications

*Overflow pit is positioned at the maximum water surface elevation of the practice, as per the contract documents

*Overflow pit is positioned at the maximum water surface elevation of the practice, as per the contract documents

*Sufficient freeboard is provided between the overflow and inlet such that the inlet is not inundated by design storm flows

*Sufficient freeboard is provided between the overflow and inlet such that the inlet is not inundated by design storm flows

*Overflow grate matches design specifications

*Overflow grate matches design specifications

*Overflow grates located in high-traffic areas are screwed on or equipped with locks

*Overflow grates located in high-traffic areas are screwed on or equipped with locks<br>

Mistakes to Avoid:

Mistakes to Avoid:<br>

*Backflows – ensure that backflows are avoided by confirming that inlet and overflow elevations match design specifications with surveys

*Backflows – ensure that backflows are avoided by confirming that inlet and overflow elevations match design specifications with surveys

*Incorrect sequencing – install overflow drain prior to backfilling with granular material and engineered soil

*Incorrect sequencing – install overflow drain prior to backfilling with granular material and engineered soil

*Incorrect grate material – avoid using plastic overflow grates due to breakages and UV degradation

*Incorrect grate material – avoid using plastic overflow grates due to breakages and UV degradation<br>

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