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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002414

Structural height: Distance between the lowest point in the excavated foundation
(excluding narrow fault zones) and the top of dam.

. The structural height of an embankment (earth or rockfill) dam is the vertical
distance between the top of the embankment and the lowest point in the excavated
foundation area, including the main cutoff trench, if any, but excluding small
trenches or narrow backfilled areas. The top elevation does not include the
camber, crown, or roadway surfacing.
. The structural height of a concrete dam is the vertical distance between the
top of the dam and lowest point of the excavated foundation area, excluding
narrow fault zones.

Sulfate attack: Damage to concrete caused by the effects of a chemical reaction between
sulfates in soils or ground water and hydrated lime and hydrated calcium aluminate in
cement paste. The attack results in considerable expansion and disruption of paste.

Supervisory control: A system used to monitor conditions and operate mechanical
features associated with a facility from a location other than at the site.

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, ~ Tagout: See "clearance."
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Tailrace: See "afterbay."

Tailwater: The water in the natural stream immediately downstream from a dam. The
elevation of water varies with discharge from the reservoir.

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Toe: The contact between the upstream or downstream face of the dam and natural
ground.

Toe drain(s): Open jointed tile or perforated pipe located at the toe of the dam used in
conjunction with horizontal drainage blankets to collect seepage from the embankment
and foundation and conveys the seepage to a location downstream from the dam.

Trash rake: A device that is used to remove debris which has collected on a trashrack to
prevent blocking the associated intake.

Trashrack: A metal or reinforced concrete structure placed at the intake of a conduit,
pipe, or tunnel that prevents entrance of debris over a certain size.

Tunnel: An enclosed channel that is constructed by excavating through natural ground.
A tunnel can convey water or house conduits or pipes.

Turnout: A structure used to divert water from a supply channel to a smaller channel.