Outlet Gates

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Outlet Gates
5-1. General
Similar to navigation lock gates, outlet gates use a horizontal
framing system. As with navigation lock gates, vertical
framing systems are not structurally efficient and require
special framing to accommodate roller guides for hoisting
operations. Hence, vertical framing is not recommended for
new vertical lift gates, except for replacement in kind. Outlet
gates use fixed wheel, tractor, and slide end support systems.
Paragraph 2-2c describes the different uses of outlet gates.
Much of the information regarding framing, loads, and load
types provided in this chapter references information provided
in Chapter 3. Only information unique to outlet gates is provided
here.
5-2. Framing Systems
Horizontal girder framing is the most common type of
framing system used for outlet gates. They may be framed
with plate girders or rolled shapes. This type of framing
system is described in paragraph 3-2a. The main difference in
framing compared with that of spillway crest gates and navigation
lock gates is that outlet gates require a sloping bottom or
flat bottom with lip extension on the downstream side to reduce
downpull forces while operating with water flow

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