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O ,,... ....'r'~ "U''''I V ....0'. Appurtenant Wor~s Outlet Wor~s. - A combination of structures and equipment required for the safe operation and control of water released from the reservoir to serve various purposes, i.e., regulate stream flow and quality; release floodwater; and provide irrigation, municipal, and/or industrial water. Included in the outlet wor~s are the inta~e structure, conduit, control house-gates, regulating gate or valve, gate chamber, and stilling basin. Spillway (Service). - A structure located on or adjacent to a storage or detention dam over or through which surplus or floodwater which cannot be contained in the allotted storage space are passed, and at diversion dams to bypass flows exceedi ng those which are turned into the di vers i on system. Included as part of the spillway would be the inta~e and/or control structure, discharge channel, terminal structure, and entrance and outlet channels. Auxiliary Spillway. - A spillway, usually located in a saddle or depression in the reservoir rim which leads to a natural or excavated waterway, located away from the dam which permits the planned release of excess flood flow beyond the capacity of the service spillway. A control structure is seldom furnished. The crest is set at the maximum water surface elevation for a IOO-year flood or some other specific frequency flood. The auxiliary spillway thus has only infrequent use. Emergency Spillway. - A spillway which provides for additional safety should emergencies not contemplated by normal design assumptions be encountered, i.e., inoperable outlet works, spillway gates, or spillway structure problems. The crest is usually set at maximum water surface. Diversion Capacity. - The flow which can be passed through the canal headwor~s at a dam under normal head. 7