As used in this chapter, the following terms shall have
the meanings indicated:
CRITICAL ENVIRONMENTAL AREA
A specific geographic area designated by a state or local agency
having exceptional or unique characteristics that make the area environmentally
important.
DEVELOPMENT or DEVELOPMENT ACTIVITY
To make a site or area available for use by physical alteration.
Development includes but is not limited to providing access to a site, clearing
of vegetation, grading, earthmoving, providing utilities and other services
such as parking facilities, stormwater management and erosion control systems,
and sewage disposal systems, altering landforms, the filling, changing course
or obstructing the flow of any natural waterway or watercourse, or the construction
of a structure on the land.
DRYWELL
Similar to infiltration trench but smaller with inflow from pipe;
commonly covered with soil and used for drainage areas of less than 1 acre
such as roadside inlets and rooftop runoff.
EROSION
The removal of soil particles by the action of water, wind, ice or
other geological agents.
EXFILTRATION
The downward movement of runoff through the bottom of an infiltration
system into the soil.
EXTENDED DETENTION
A practice to store stormwater runoff by collection as a temporary
pool of water and provide for its gradual (attenuated) release over 24 hours
or more. A practice which is used to control peak discharge rates, and which
provides gravity settling of pollutants.
FIRST FLUSH
The delivery of a disproportionately large load of pollutants during
the early part of storms due to the rapid runoff of accumulated pollutants.
The "first flush" in these guidelines is defined as the runoff generated from
a one-year twenty-four-hour storm event from land which has been made more
impervious from predevelopment conditions through land grading and construction/development
activities.
FLOODPLAIN
For a given flood event, that area of land temporarily covered by
water which adjoins a watercourse.
FOREBAY
An extra storage area or treatment area, such as a sediment pond
or created wetland, near an inlet of a stormwater management facility to trap
incoming sediments or take up nutrients before they reach a retention or extended
detention pond.
IMPERVIOUS AREA
Impermeable surfaces, such as pavement or rooftops, which prevent
the percolation of water into the soil.
INFILTRATION
A practice designed to promote the recharge of groundwater by containment
and concentration of stormwater in porous soils.
INFILTRATION BASIN
An impoundment made by excavation or embankment construction to contain
and exfiltrate runoff into the soil layer.
OUTFALL
The terminus of a storm drain where the contents are released.
PEAK FLOW
The maximum rate of flow of water at a given point and time resulting
from a storm event.
PEAK FLOW ATTENUATION
The reduction of the peak discharge of storm runoff by storage and
gradual release of that storage.
RETENTION
A practice designed to store stormwater runoff by collection as a
permanent pool of water without release except by means of evaporation, infiltration,
or attenuated release when runoff volume exceeds the permanent storage capacity
of the Town of Geneva of the permanent pool.
RIPRAP
A combination of large stone, cobbles and boulders used to line channels,
stabilize streambanks, reduce runoff velocities.
RISER
A vertical pipe that is used to control the discharge rate from a
pond for a specified design storm.
STREAM CORRIDOR
The landscape features on both sides of a stream, including soils,
slope and vegetation, whose alteration can directly impact the streams physical
characteristics and biological properties.
SWALE
A natural depression or wide shallow ditch used to temporarily route,
or filter runoff.