219
edits
Changes
Jump to navigation
Jump to search
Line 95:
Line 95: + − {{:Overflow: Installation}}+ + + + + + + + + + + + + + + + + + + + + +
→Overflows
==Overflows==
==Overflows==
[[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.
#Fit a metal, domed grate to the overflow.
#Install overflow pit to grade at the location specified in the contract documents.
'''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.
<gallery mode="packed" widths=300px heights=300px>
overflow-pipe-install.jpg | Overflow pipe installed to an underdrain T-connection. (Photo Source: CVC, 2010)
overflow-plastic-cap.jpg | Overflow installed with a plastic cap. Note that the use of plastic grates is discouraged. (Photo Source: CVC, 2012)
</gallery>
==Monitoring wells==
==Monitoring wells==