EP 1110-2-13
28 Jun 96
and the possibility of its occurrence will depend on
An instrument used for measuring fluid pressure (air
the void ratio or relative density of a cohesionless or
or water) within soil, rock, or concrete.
slightly cohesive soil and the confining pressure.
Piping
The progressive development of internal erosion by
Logboom
A chain of logs, drums, or pontoons secured end to
seepage.
end and floating on the surface of a reservoir so as to
divert floating debris, trash, and logs.
Plunge pool
A natural or artificially created pool that dissipates the
energy of free falling water.
Maximum flood control level
The highest elevation of the flood control storage.
Pore water pressure
The interstitial pressure of water within a mass of soil,
Maximum pool
The highest pool elevation resulting from the inflow
rock, or concrete.
design flood.
The likelihood of an event occurring.
Maximum wave
The highest wave in a wave group.
Probable Maximum Precipitation (PMP)
Theoretically, the greatest depth of precipitation for a
Minimum operating level
The lowest level to which the reservoir is drawn
given duration that is physically possible over a given
down under normal operating conditions.
size storm area at a particular geographical location.
Observation well
Pumped storage reservoir
A hole used to observe the groundwater surface at
A reservoir filled entirely or mainly with water
atmospheric pressure within soil or rock.
pumped from outside its natural drainage area.
Outlet
Quality (as related to construction)
An opening through which water can be discharged.
Conformance to properly developed requirements.
Outlet works
Quality Assurance (QA)
A device to provide controlled releases from a
The procedure by which the Government fulfills its
reservoir.
responsibility to be certain the contractor's quality
control is functioning and the specified end product is
realized.
Parapet wall
A solid wall built along the top of a dam (upstream or
downstream edge) used for ornamentation, for safety
of vehicles and pedestrians, or to prevent overtopping
Quality Management
caused by wave runup.
All control and assurance activities instituted to
achieve the product quality established by the contract
requirements.
Penstock
A pressurized pipeline or shaft between the reservoir
and hydraulic machinery.
Reservoir
A body of water impounded by a dam and in which
water can be stored.
Phreatic surface
The free surface of water seeping at atmospheric
pressure through soil or rock.
Reservoir regulation (or operating) procedure
Operating procedures that govern reservoir storage
and releases.
Piezometer
B-10
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