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Technical Manual for Dam Owners - Impact of Animals on Earthen Dams


Quiz Questions

1.Earthen dams rely on a thick placement of compacted soils to withstand the water pressure of the pool contained behind the embankment.
True
False
2. Zoned embankment dams usually contain a central core designed to produce a lower phreatic surface (static water level within a dam embankment) within the downstream slope than the theoretical surface often assumed for homogeneous
True
False
3.Wildlife excavates dens, burrows, and tunnels within embankment dams, causing large voids that strengthen the structural integrity of the dam.
True
False
4.What does FEMA stand for?
Federal Emergency Management Agency
Functional Emergency Management Agency
Federal Emergency Management Association
None of the above
5.The goal of inspecting the upstream slope of the earthen dam is to see the entire surface clearly. To ensure the inspector views the entire slope surface, the inspector must walk back and forth across the slope utilizing one of two patterns: zigzag or parallel.
True
False
6.What does figure 3-1 illustrate about?
(Refer Pg 10)
Dam Inspection Zones
Earthen Dam from Biological and Engineering Perspectives
Methods of Inspection
None of the above
7.The zone between two environments (the edge) is the best place to observe those species living at and around the dam is called forest fringe.
True
False
8.A typical dam safety inspection report should comment on width, alignment, vegetation, erosion, instabilities, and animal burrows.

True
False
9.Beaver can cause extensive damage to earthen dams by excavating bank burrows, which can cause internal erosion or structural integrity losses.
True
False
10.Methods for repairing or filling an animal burrow are essentially limited to two basic types. The first method considers filling the burrow without excavation while the second method considers excavating the burrow and backfilling the area.
True
False
11.What does ASDSO stand for?
Association of State Dam Safety Officials
Association of State Dam Safety Organization
Association of Safety Dam State Officials
None of the above
12.Ruts, near surface deformation, and loss of vegetation can be the result of frequent animal crossings, most likely by livestock.
True
False
13.Methods for repairing or filling an animal burrow are essentially limited to two basic types. The first method considers filling the burrow without excavation while the second method considers excavating the burrow and backfilling the area.
True
False
14.What does figure 5-1 illustrate about?
(Refer Pg 60)

Remedial Dam Repair Zones
Zone 1 Penetration Problems
Rip-Rap Zone
None of the above
15.Construction or repair activities on an embankment dam need not be reviewed by a dam safety professional prior to initiation.
True
False
16.Evaluation of the existing dam relative to the position of the phreatic surface and slope stability through review of pre-existing inspection reports, design drawings, design memoranda, and owner observations.
True
False
17.Mechanical Removal utilizes small and large weed harvesters to remove vegetation around the shoreline. This method achieves immediate vegetation control in small dams and does not carry water-use restrictions after treatment, unlike herbicide application.
True
False
18.Badgers can often be removed from an area through the use of cage traps, leg hold traps, or snares placed near the entrance of an active den.
True
False
19.What does CWA stand for?
Clean Water Act
Clean Water Agency
Clean Water Association
None of the above
20.Fumigants can be used to control prairie dogs in some situations, however this method is often costly, time-consuming, and particularly hazardous to other wildlife.
True
False