Hydraulic Performance of Outlet Works: Difference between revisions
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“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the [[Reservoir Level|reservoir level]] is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of [[Outlet Works|outlet works]], the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) | EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref> | “The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the [[Reservoir Level|reservoir level]] is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of [[Outlet Works|outlet works]], the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) | EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref> | ||
See also: [[Reservoir Drawdown]] | See also: [[Hydrology]] > [[Normal Flow Conditions]] > [[Reservoir Drawdown]] | ||
==Best Practices Resources== | ==Best Practices Resources== | ||
Revision as of 23:29, 16 March 2023
“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” [1]
See also: Hydrology > Normal Flow Conditions > Reservoir Drawdown
Best Practices Resources
Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA, 2010
Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA, 2007
Design of Small Dams, USBR, 1987
Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR, 1984
Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE, 1980
Trainings
On-Demand Webinar: Inlet and Outlet Hydraulics for Spillways and Outlet Structures
On-Demand Webinar: Terminal Structures and Energy Dissipation at Outlet Works and Spillways
Citations:
Revision ID: 6678
Revision Date: 03/16/2023