Standpipes, siphons, and overflows need to be regularly monitored to avoid clogging which can cause flooding and damage to your pond’s integrity.
Outlet structures are built to keep the water surface in the pond at its optimum level and to be able to drain the pond for maintenance.
If there is too much water in your pond, it may flow over the banks. Overflows can cause costly erosion damage to the infrastructure.
Overflow pipes keep the water in your pond from overflowing the banks.
Siphons serve a similar purpose but, typically draw down the water level 6-12 inch so that it can absorb rain events or fast amounts of runoff.
When the water level rises faster than a standpipe, the emergency spillway lets water go past or around without causing erosion to the levy.
Overflows need to be checked regularly to make sure there is no clogging to prevent expensive repair work.
See pages 54-55 FREE Stormwater Pond Manual
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