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gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in
gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in
various particulate size gradations.
various particulate size gradations.
= B =
= B =
=== Berm ===
A compacted earthen wall that diverts runoff or creates shallow ponding of runoff. In
some cases, runoff ponds behind the berm and gradually flows through it or is infiltrated.
=== Biofilter ===
A bioretention stormwater best management practice featuring an impermeable liner
and underdrain that prevents infiltration of runoff into the underlying native soil; provides
sedimentation and filtration of urban runoff as it passes through the mulch layer, engineered
filter media and vegetation root zone.
=== Bioretention ===
A stormwater filtration and infiltration practice. The practice is a shallow
excavated surface depression containing a prepared soil mix, mulch, and planted with specially
selected vegetation. The system is engineered to temporarily store runoff in the depression and
gradually filters it through the mulch, engineered soil mix, and root zone. They remove
pollutants from runoff through filtration in the soil and uptake by plant roots and can help to
reduce runoff volume through evapotranspiration and infiltration.
= C =
= C =
=== Check Dam ===
Structures constructed of a non-erosive material, such as suitably sized
aggregate, wood, gabions, riprap, or concrete, used to slow runoff water to allow sedimentation,
filtration, evapotranspiration, and infiltration into the underlying native soil. Can be employed in
practices such as dry and enhanced grass swales.
=== Cistern ===
Tank used to store rainwater (typically roof runoff) for later use.
= D =
= D =
=== Depression Storage ===
A technique for incorporating shallow depressed areas into urban
landscaped areas for storing and infiltrating runoff. Typically, depression storage areas are
small and have limited capacity and limited duration of retention in order to address property
owner concerns relating to insects, damage to structures and inconvenience of ponded water on
their property.
=== Detention ===
The temporary storage of stormwater to control discharge rates, and allow for
sedimentation.
=== Drawdown Time ===
The period between the maximum water level and the minimum level (dryweather
or antecedent level).
=== Dry Swale ===
Linear bioretention cells designed to convey, treat and attenuate stormwater runoff;
The engineered filter media soil mixture and vegetation slows the runoff water to allow
sedimentation, filtration through the root zone, evapotranspiration, and infiltration into the
underlying native soil.
= E=
= E=
=== Evapotranspiration ===
The combined loss of water to the atmosphere from land and water
surfaces by evaporation and from plants by transpiration.
=== Enhanced Grass Swale ===
Vegetated open channels designed to convey, treat and attenuate
stormwater runoff, also referred to as enhanced vegetated swales. Enhanced grass swales are
not capable of providing the same water balance and water quality benefits as dry swales, as
they lack the engineered soil media and storage capacity.
=== Environmental Impact Report (EIR) ===
The evaluation of the possible effects that may arise from a
proposed project on the environment, together consisting of the natural, social and economic
aspects.
=== Exfiltration ===
Loss of water from a drainage system as a result of percolation or absorption into
the surrounding medium (e.g., the infiltration of water into the native soil through a perforated
pipe wall as it is conveyed).
= F =
= F =