Division 4: Project Planning & Design Flashcards
What symbol represents the distance in feet from a noise source to the top of the sound barrier?
π΄
What symbol represents the distance in feet from a noise source to the bottom of the sound barrier?
π΅
What symbol represents the line-of-sight distance in feet from a sound source to a receiver?
π·
What symbol represents sound frequency in hertz (Hz)?
π
What symbol represents effective height in feet?
π»
What symbol represents noise level in decibels (dB)?
π
What symbol represents emissivity?
Ξ΅
What is emissivity?
The relative ability of a materialβs surface to emit heat by radiation.
What is runoff?
Stormwater that accumulates on the site in excess of what can be absorbed by the ground.
What are the two types of drainage systems?
Aboveground and underground.
What are some elements of an aboveground drainage system?
Pervious paving, sheet flow, channels, gutters built into roadways and parking areas, and ground swales as part of the landscaping.
What are some elements of an underground drainage system?
Perforated drains and enclosed storm sewers that connect to either a municipal storm sewer system or a natural drainage outlet, like a river.
What is sheet flow?
Water that drains across a sloping surface, whether paved, grassy, or otherwise landscaped.
What is the minimum slope required for surface drainage on a very smooth and carefully constructed surface?
0.5%
What is the generally accepted slope required for surface drainage on most paved surfaces?
1.5%
