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[[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.overflow-plastic-cap.jpg | Overflow installed with a plastic cap. Note that the use of plastic grates is discouraged.</gallery>
→Overflows
{{:Overflow: Installation}}
{{:Overflow: Installation}}
==Monitoring wells==
==Monitoring wells==