Reservoir Drawdown: Difference between revisions
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“Low level outlets are provided to maintain downstream flows for all levels of the [[reservoirs]] operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref> | “Low level outlets are provided to maintain downstream flows for all levels of the [[reservoirs]] operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref> | ||
See also: [[Hydraulics]] > [[Hydraulic Performance of Outlet Works]] | |||
==Examples== | ==Examples== | ||
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==Best Practices Resources== | ==Best Practices Resources== | ||
{{Document Icon}} [[Criteria and Guidelines for Evacuating Storage Reservoirs and Sizing Low-Level Outlet Works (ACER TM No. 3) | Criteria and Guidelines for Evacuating Storage Reservoirs and Sizing Low-Level Outlet Works (ACER TM No. 3), USBR | {{Document Icon}} [[Criteria and Guidelines for Evacuating Storage Reservoirs and Sizing Low-Level Outlet Works (ACER TM No. 3) | Criteria and Guidelines for Evacuating Storage Reservoirs and Sizing Low-Level Outlet Works (ACER TM No. 3), USBR]] | ||
{{Document Icon}} [[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 4: General Outlet Works Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 4: General Outlet Works Design Considerations), USBR | {{Document Icon}} [[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 4: General Outlet Works Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 4: General Outlet Works Design Considerations), USBR]] | ||
{{Document Icon}} [[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94) | Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94), FEMA | {{Document Icon}} [[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94) | Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94), FEMA]] | ||
{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE | {{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) | Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE]] | ||
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Latest revision as of 04:56, 21 July 2023
“Where practicable, reservoir release facilities should be provided to lower the pool to a safe level adequate to correct conditions that might threaten the integrity of the dam”.[1] The outlet works should be designed to draw down the reservoir within a reasonable period of time assuming normal inflows from the watershed. Several state dam safety agencies require that dams have the ability to draw down the reservoir pool by a specified depth of water within a certain timeframe. These requirements vary by jurisdiction.
“Low level outlets are provided to maintain downstream flows for all levels of the reservoirs operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated”.[2]
See also: Hydraulics > Hydraulic Performance of Outlet Works
Examples
Learn about the important of having an operable reservoir drain at DamFailures.org
Best Practices Resources
Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94), FEMA
Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420), USACE
Citations:
Revision ID: 7362
Revision Date: 07/21/2023