WSP00774

• File Number: 8220.106.A.1.a
• Description: Animas La Plata Project
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/3000
• Author: Unknown
• Title: Animas La Plata Annual Operating Plan - From 2002 ALP-POC Notebook - Date Unknown
• Water Supply Pro - Doc Type: Report/Study

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002404

Chute: A conduit for conveying free-flowing materials at high velocity to lower
elevations.

Clearance: A procedure used to establish, under tightly controlled discipline, a safe
environment for maintenance, repair, or inspection. It includes systematically isolating
pertinent equipment from all sources of hazardous energy (hydraulic, electrical,
mechanical, pneumatic, and chemical) and attaching safety tags or locks to the
appropriate controls. Also, it includes a written statement that documents isolation of the
equipment (also referred to as "lockout" or "tagout").

Coating: The protective material applied to the outer surface of metalwork.

Conduit: A pipe, box, or horseshoe structure, or natural channel that is constructed by
means of "cut and cover". A conduit can convey water or house other conduits or pipes.

Crest: The' top surface of the dam. A roadway may be constructed across the crest to
permit vehicular traffic or facilitate operation, maintenance, and examination of the dam.
Also the high point of the spillway control section.

Crown: The highest point of the interior of a circular conduit, pipe, or tunnel.

Cubic feet per second (ft3/sec): A unit of discharge for measurement of a flowing liquid
equal to a flow of 1 cubic foot per second, 449 gallons per minute, 1.98 acre-foot per day.

Curtain grouting: The process of pressure grouting deep holes under a dam or in an
abutment to form a watertight barrier and effectively seal seams, fissures, fault zones, or
fill cavities in the foundation or abutment.

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Cutoff (keyway) trench: An excavation in the foundation of an embankment (earth or
rockfill) dam, usually located upstream of the darn axis or centerline crest which
extends to bedrock or to an impervious stratum. The excavation is backfired with
impervious material to reduce percolation under the dam.

Cutoff wall: A wall of impervious material (e.g., concrete, asphaltic concrete, timber,
steel sheet piling, or impervious grout curtain) located in the foundation beneath
the dam and which forms a water barrier and reduces seepage under a dam or
spillway.

D

Dam: A barrier built across a watercourse to impound or divert water.

Dam tender: The person responsible for the daily or routine operation and maintenance
activities of a dam and its appurtenant structures. The dam tender commonly
resides at or neat the dam.

-, Deflection: Upstream or downstream movement of a dam or dike.