Reservoir Drawdown: Difference between revisions
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“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”.<ref name="FEMA94">[[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94) | FEMA P-94 Federal Guidelines for Dam Safety: Selecting and Accommodating Inflow Design Floods for Dams, FEMA, 2013]]</ref> | “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”.<ref name="FEMA94">[[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94) | FEMA P-94 Federal Guidelines for Dam Safety: Selecting and Accommodating Inflow Design Floods for Dams, FEMA, 2013]]</ref> The [[Outlet Works|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”.<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> | ||
Revision as of 00:26, 13 December 2022
“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]
Examples
Learn about the important of having an operable reservoir drain at DamFailures.org
Best Practices Resources
Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) (U.S. Army Corps of Engineers)
Selecting and Accommodating Inflow Design Floods for Dams (Federal Emergency Management Agency)
Citations:
Revision ID: 5212
Revision Date: 12/13/2022