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[[Overflow|Overflows]] are features of inline facilities and convey larger storm events out of the LID feature.<br>
====Overflows====
[[Overflow|Overflows]] are features of inline facilities and convey larger storm events out of the LID feature.
'''Construction Steps:'''<br>
'''Construction Steps:'''
#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.
'''Key Inspection Points:'''<br>
'''Key Inspection Points:'''
*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.
'''Mistakes to Avoid:'''<br>
'''Mistakes to Avoid:'''
*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.
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<gallery mode="packed" widths=300px heights=300px>