Exam (elaborations)
SWM PLAN TEST QUESTIONS AND ANSWERS 2024
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SWM PLAN TEST QUESTIONS AND ANSWERS 2024
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SWM PLAN TESTWhat is a dry swale?
A bio-retention cell that is shallower, configured as a linear channel, and covered
with turf or other surface material.
What does an under-drain system typically consist of?
A perforated pipe and within a gravel layer.
Wet swales, constructed wetlands, and wet ponds are an ideal environment for
what three things?
-Gravitational settling
-Biological Uptake
-Microbial Activity
What is the only situation that an Extended detention pond or a constructed
wetland should be considered?
If there is remaining treatment volume or channel protection volume to manage
after all other upland runoff reduction practices have been considered and
properly credited.
What two benefits can temporary ponding bring about?
,-Enables particulate pollutants to settle out-Reduces the maximum peak
discharge to the downstream channel
Extended detention ponds are normally combined with what other 2 practices?
Either wet ponds or constructed wetlands
What is the hydrologic cycle?
the process of the earth's water continuously moving and changing phases
(between liquid, vapor, and ice) over millions of years.
What percent of water on earth is "circulating in inland waterways, in the
atmosphere or soil, or within organisms"?
Only 0.4%
94% of water is chemically bound in rocks. Of the remaining 6%, 97% of that
water is in the oceans. Of the remaining 2.5%, 69.5% is in glaciers or permafrost,
and 30% is in aquifers
What is Stormwater Runoff?
Rain or snow that does not soak into the ground and flows overland to
conveyance systems (natural or man-made)
List some characteristics that influence stormwater discharge quantity and
quality.
-Soil characteristics, topography, vegetation
,-Weather patterns (rainfall intensity, frequency, duration)
-Channel lengths (long meandering vs. short straight)
-Channel characteristics (roughness, slope)-Hydraulic Structrures, BMPs
What negative impacts are associated with removal of vegetation with regards to
stormwater?
Vegetation intercepts, slows, and returns rainfall to the air through evaporation
and transpiration
What negative impacts are associated with grading for development with regards
to stormwater?
Grading flatten hilly terrain and fills in natural depressions that would normally
slow and provide temporary storage for rainfall. Also, the remaining subsoil is
compacted reducing the amount of infiltration.
When runoff increases due the addition of impervious surfaces, in general what
three things decrease"?
-Evapotranspiration
-Deep Infiltration
-Shallow Infiltration
What is the belief that Environmental Site Design is grounded in?
Environmental balance can be maintained as new communities are developed
throughout our watersheds if basic principles are obeyed.
, Describe the contrast between the old view of stormwater and Environmental
Site Design's view of stormwater.
The old view of stormwater was as a waste product in need of disposal, but ESD
views stormwater as a precious resource that must be used carefully
In the field of stormwater management, what does (Tv) stand for?
treatment volume
In the field of stormwater management, what does (LID) stand for?
Low Impact Development
What would (TP) stand for with regards to BMP Pollutant Removal Effeciencies?
total phosphorus
In the field of stormwater management, what does (EMC) stand for?
Event Mean Concentration
In the field of stormwater management, what does (MTD) stand for?
Manufactured Treatment Devices
In the field of stormwater management, what does (HSG) stand for?
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