303(d) waterbody - ANSWERA list of lakes, rivers, and streams that have been designated as impaired or threatened by a pollutant(s) for which one or more TMDL(s) are needed. Impaired means that the water is not meeting state water quality standards
319 - ANSWERThe section of the Federal Clean Wa...
Stormwater Terms Correct Questions &
Answers!!
303(d) waterbody - ANSWERA list of lakes, rivers, and streams that have been designated as impaired
or threatened by a pollutant(s) for which one or more TMDL(s) are needed. Impaired means that the
water is not meeting state water quality standards
319 - ANSWERThe section of the Federal Clean Water Act that deals with nonpoint pollution
Basin plan - ANSWERA plan and all implementing regulations and procedures including but not
limited to capital projects, public education activities, land use management regulations adopted by
ordinance for managing surface and storm water management facilities, and features within
individual subbasins.
Biofiltration swale or Bioswale sketch - ANSWERA long, gently sloped, vegetated ditch designed to
filter pollutants from stormwater. Grass is the most common vegetation, but wetland vegetation can
be used if the soil is saturated.
Dead storage - ANSWERThe volume available in a depression in the ground below any conveyance
system, or surface drainage pathway, or outlet invert elevation that could allow the discharge of
surface and storm water runoff.
Depression storage - ANSWERThe amount of precipitation that is trapped in depressions on the
surface of the ground.
Buffer - ANSWERA designated area adjacent to and a part of a steep slope or landslide hazard area
which protects slope stability, attenuation of surface water flows, and landslide hazards reasonably
necessary to minimize risk; or a designated area adjacent to or a part of a stream or wetland that is
an integral part of the stream or wetland ecosystem.
Business, Industry, and Land Owners - ANSWERBusinesses, industry, and land owners are responsible
for stormwater runoff from their property and may need to obtain a stormwater NPDES permit from
EPA and/or comply with their city's municipal stormwater NPDES permit. Compliance with a
stormwater permit may require the use of stormwater best management practices (BMPs); their use
is recommended although not required.
Catch basin insert - ANSWERA device installed underneath a catch basin inlet to treat stormwater
through filtration, settling, absorption, adsorption, or a combination of these mechanisms. There are
a number of shapes, sizes, and configurations of inserts available.
Catch Basin, Type I - ANSWERAn underground concrete water receiving inlet, rectangular in shape
(approximately 3' x 2' x 4' deep) with a slotted iron grate on top to inlet water or a solid rectangular
cover. Water may also enter/exit through culverts visible in the side walls of basin. Also referred to as
Inlet.
Catch Basin, Type II - ANSWERA round concrete underground basin (4'-8' diameter; 6' or greater
deep); may contain Flow Restrictor/Oil Pollution control device. These basins are also required when
larger diameter culverts are used. Also referred to as a Manhole or Control Manhole.
CFR - ANSWERCode of Federal Regulations
Compliance with TMDLs in Idaho - ANSWERA total maximum daily load (TMDL) is a water quality
improvement plan that provides a calculation of the maximum amount of a pollutant that a water
body can receive and still meet water quality standards. TMDLs are calculated for surface water
bodies that do not meet water quality standards; their purpose is to improve poor water quality.
Since stormwater can discharge pollutants to streams, lakes, and rivers, stormwater discharges must
be consistent with the requirements of a TMDL that has been developed for a particular water body.
If a TMDL has been established for the stream, lake, or river where stormwater will discharge, the
stormwater discharger should contact DEQ to determine if there are specific TMDL stormwater
requirements. Following BMPs from the Catalog of Stormwater Best Management Practices for Idaho
Cities and Counties described below is generally sufficient to meet TMDL requirements, but it is best
to discuss BMPs with DEQ before implementing if a TMDL is in place.
Constructed conveyance system facilities - ANSWERGutters, ditches, pipes, channels, and most flow
control and water quality treatment facilities.
Conveyance System - ANSWERDrainage facilities and features that collect, contain, and provide for
the flow of surface and storm water from the highest points on the land down to a receiving water.
Conveyance systems are made up of natural elements and of constructed facilities.
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