426
edits
Changes
Jump to navigation
Jump to search
Created page with "Overflows are features of inline facilities and convey larger storm events out of the LID feature. Construction Steps: #Connect the overflow drain to the underdrain #Install overflow pit to grade at the location specified in the contract documents #Fit a metal, domed grate to the overflow Key Inspection Points: *Overflow drain matches design specifications *Overflow pit is positioned at the maximum water surface elevation of the practice, as per the cont..."
[[Overflow|Overflows]] are features of inline facilities and convey larger storm events out of the LID feature.
Construction Steps:
#Connect the overflow drain to the underdrain
#Install overflow pit to grade at the location specified in the contract documents
#Fit a metal, domed grate to the overflow
Key Inspection Points:
*Overflow drain matches design specifications
*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
*Overflow grate matches design specifications
*Overflow grates located in high-traffic areas are screwed on or equipped with locks
Mistakes to Avoid:
*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 grate material – avoid using plastic overflow grates due to breakages and UV degradation
Construction Steps:
#Connect the overflow drain to the underdrain
#Install overflow pit to grade at the location specified in the contract documents
#Fit a metal, domed grate to the overflow
Key Inspection Points:
*Overflow drain matches design specifications
*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
*Overflow grate matches design specifications
*Overflow grates located in high-traffic areas are screwed on or equipped with locks
Mistakes to Avoid:
*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 grate material – avoid using plastic overflow grates due to breakages and UV degradation