Outlet Weirs

Details

Aluminum Outlet Weir structures are an alternative to traditional vertical standpipe riser systems where larger amounts of water need to be conveyed. They can also be used as a vertical drop structure in an open channel controlling soil erosion in the waterway. These Outlet Weir structures are constructed from Aluminum Structural plate and are offered in two basic configurations. 

Drop Toewall Structures:

This design is used for grade control in waterways and where drops into drainage ditches are low – four feet or less. Weir heights range between 1.9’ - 4.0’ with widths from 7’ - 20’ and discharge rates up to 400 CFS. These structures have a semicircular shape weir with headwalls that anchor into a concrete apron and toe wall.

Drop Spillway Structures:

Drop spillway structures are used where site conditions require higher overfalls or larger flow capacities than can be accommodated by Drop Toewalls. They are like Drop Toe Wall structures except for their overall weir heights increase to 5.0’ or 6.0’ with widths ranging from 7’ - 20’ wide and discharge rates up to 510 CFS. These structures have a horseshoe shape with additional downstream headwalls, and wing walls that are anchored into an extended concrete apron for added stability to handle the extra downstream flow.