Changes

Construction Steps:<br>

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<br>

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

Key Inspection Points:<br>

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<br>

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

Mistakes to Avoid:<br>

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<br>

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

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