Upstream Control: Difference between revisions

Revision as of 17:43, 24 June 2022

Upstream Control with Sloping Gate

A typical installation of an inclined slide gate

Dams with inclined gates are common on small dams. They provide easy access for the gate operator but can present maintenance difficulties. The gate is susceptible to blockage and can be dislodged from the guides. If maintenance is required, the reservoir has to be drained. The gate stem should be buried in riprap or encase in concrete.

Pros of Inclined Gate:

Hydraulically efficient gate position
"Spilled" water is conserved (in delivery system)

Cons of Inclined Gate:

Gate stem must be buried to protect from damage
Easy to damage by misoperation - operator must be careful not to bend stem
Susceptible to clogging with debris - trash rack is important.

Sloping Gate Examples Sloping Gate Example 1 Sloping Gate Example 2 Protecting the Gate Upstream Gate Stem can be Protected by Concrete or Riprap Upstream Control with Vertical Gate Dams with vertical gates generally have the gate placed on the low-level pipe inlet or in a drop-inlet structure. Vertical gates are usually accessed by a walkway, are less expensive, and generally easier to install. Vertical gates located on a pipe inlet are only recommended on very small reservoirs, with gentle upstream slopes. On larger ponds, the gate stem and walkway are susceptible to damage from ice. In addition, if something happens to the walkway, the gate operator cannot be accessed at full pool. Vertical gates located in a drop-inlet tower have a reduced potential for ice damage and have easier access for repair. Ice can still damage towers, read further for more information.

Vertical Gate on Pipe Inlet

Vertical Gate in Drop-Inlet

Vertical Gate in Tower

Pros of Vertical Gate: • Easy access to gate for operation • Relatively easy installation • "Spilled" water is conserved (in delivery system if drop inlet is present) • Cost Effective • Hydraulically efficient gate position Cons of Vertical Gate: • Stem and riser can be damaged by ice if not protected by tower • If a drop inlet is not present, an auxiliary spillway designed to handle frequent flows is needed, often with high maintenance needs. • Venting is required Examples Upstream Control with Single Gate Upstream Control with Multiple Gates Cautions Ice and Debris may cause Damage
Revision ID: 1460
Revision Date: 06/24/2022

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-Upstream Control with Sloping Gate
+==Upstream Control with Sloping Gate==
-Dams with inclined gates are common on small dams. They provide easy access for the gate operator but can present maintenance difficulties. The gate is susceptible to blockage and can be dislodged from the guides. If maintenance is required, the reservoir has to be drained. The gate stem should be buried in riprap or encase in concrete.
 {{Picture
 |image=
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 A typical installation of an inclined slide gate
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+Dams with inclined gates are common on small dams. They provide easy access for the gate operator but can present maintenance difficulties. The gate is susceptible to blockage and can be dislodged from the guides. If maintenance is required, the reservoir has to be drained. The gate stem should be buried in riprap or encase in concrete.
+'''Pros of Inclined Gate:'''
+*Hydraulically efficient gate position
-Pros of Inclined Gate:
+*"Spilled" water is conserved (in delivery system)
-• Hydraulically efficient gate position
+'''Cons of Inclined Gate:'''
-• "Spilled" water is conserved (in delivery system)
+*Gate stem must be buried to protect from damage
-Cons of Inclined Gate:
+*Easy to damage by misoperation - operator must be careful not to bend stem
-• Gate stem must be buried to protect from damage
+*Susceptible to clogging with debris - trash rack is important.
-• Easy to damage by misoperation - operator must be careful not to bend stem
-• Susceptible to clogging with debris - trash rack is important.
 Sloping Gate Examples
 Sloping Gate Example 1