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Last modified
1/26/2010 10:08:25 AM
Creation date
10/5/2006 4:08:59 AM
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Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
Glossary of Terms for Dam Safety
Date
2/1/1988
Prepared By
Interagency Committee on Dam Safety
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Stilling basin. A basin constructed to dissipate the energy of rapidly <br />flowing water, eg., from a spillway or outlet, and to protect the riverbed <br />from erosion. <br /> <br />Stoplogs. Large logs, timbers, or steel beams placed on top of each other <br />with their ends held in guides on each side of a channel or conduit so as to <br />provide a cheaper or more easily handled means of temporary closure than a <br />bulkhead gate. <br /> <br />Storage. The retention of water or delay of runoff either by planned opera- <br />tion, as in a reservoir, or by temporary filling of overflow areas, as in the <br />progression of a flood wave through a natural stream channel. Definitions of <br />specific types of storage in reservoirs are: <br /> <br />a. Dead storage. The storage that lies below the invert of the lowest <br />outlet and that, therefore, cannot readily be withdrawn from the <br />reservoir. <br /> <br />b. Inactive storage. The storage volume of a reservoir between the <br />crest of the invert of the lowest outlet and the minimum operating <br />level. <br /> <br />c. Active storage. The volume of the reservoir that is available for <br />some use such as power generation, irrigation, flood control, water <br />supply, etc. The bottom elevation is the minimum operating level. <br /> <br />d. Live storage. The sum of the active and the inactive storage. <br /> <br />e. Reservoir capacity. The sum of the dead and live storage of the <br />reservoir. <br /> <br />f. Flood surcharge. The storage volume between the top of the active <br />storage and the design water level. <br /> <br />Thrust block. A massive block of concrete built to withstand a thrust or pull. <br /> <br />Toe of dam. The junction of the face of a dam with the ground surface. For <br />concrete dams, see heel. <br /> <br />Top thickness (top width). The thickness or width of a dam at the level of <br />the top of dam (excluding corbels or parapets). In general, the term thick- <br />ness is used for gravity and arch dams, and width is used for other dams. <br /> <br />Top of dam. The elevation of the uppermost surface of a dam, usually a road <br />or walkway excluding any parapet wall, railing, etc. <br /> <br />Trashrack. A device located at an intake to prevent floating or submerged <br />debris from entering the intake. <br /> <br />Tunnel. A long underground excavation with two or more openings to the <br />surface, usually having a uniform cross section used for access, conveying <br />flows, etc. <br /> <br />-l2- <br />
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