Controlled Spillways
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| A fuseplug emergency spillway (bottom) at the New Waddell Dam.
(Image Source: Wikipedia) |
“A controlled crest is one that includes gates which are used to control the flow; the uncontrolled crest is one unencumbered by gates”. [1] “Controlled spillways include crest gates that serve as a movable damming surface allowing the spillway crest to be located below the normal operating level of a reservoir or channel”.[2]
“For controlled spillways that are not integral with a concrete dam (i.e., located away from the dam on or through abutments, or on or through reservoir rim), existing topography must provide adequate space without excessive excavation. Also, the existing topography must allow appropriate orientation (alignment of the spillway between the reservoir and downstream river or stream) of the conveyance feature and terminal structure. Additionally, economics will come into play for all controlled spillways”.[3]
Types of Controlled Spillways
Best Practices Resources
Design of Spillway Tainter Gates (EM 1110-2-2702), USACE
Hydraulic Design of Spillways (EM 1110-2-1603), USACE
Citations:
Revision ID: 7461
Revision Date: 07/25/2023