Shared Flashcard Set

Details

LD2 acronyms
ld acro
29
Civil Engineering
Undergraduate 3
11/09/2011
Click here to study/print these flashcards.

Create your own flash cards! Sign up here.

Additional Civil Engineering Flashcards

 

 

Cards

Term
LOS
 Definition
Level of service - qualitative measurement of operating conditions
Term
DHV
 Definition
Design Hour Volume - For urban highways, the DHV is approximately 8-12% of the
ADT
Term
ADT
 Definition
Average Daily Traffic - Does not reflect specific variations in volume during
peak hours
Term
Spacing intersections between _________ on low
volume streets can discourage “cut through” traffic
 Definition
100' - 150'
Term
Minimum approach angle typically ________
 Definition
60 -75 degrees
Term
Utility Strips

Typical width of ____
____ minimum width to allow for tree planting
 Definition
2'-4'

5'-6'
Term
Sidewalk Width

___ in moderate density residential areas
_____ in locations of high pedestrian traffic
 Definition
4'

6'-10'
Term
Shoulder width

___ width, comprised of _________.
 Definition
6' gravel
Term
There are _ major
types of vertical
curves, _ crest and _
sag.
 Definition
6; 3; 3
Term
Water system design considerations:
 Definition
Pressure
Flow
Storage
Term
Typical pressure range?
High – __ psi or greater
Low – __ psi or less
 Definition
80; 20
Term
_”-__” diameter for most water supply networks
 Definition
6; 20
Term
DIP
 Definition
Ductile Iron Pipe - most common material
Schedule 40 PVC is also popular
Term
Blowoff Valves

Located where?
 Definition
Low points
Ends of branches
Term
Water is comprised of _-_% air by volume
 Definition
2-3
Term
Hydrants

Hydrants typically have two ___”
hose connections and one ___”
pumper connection
 Definition
2.5; 4.5
Term
Hydrants

Located _-_’ behind the curb
with the pumper connection
facing the street
 Definition
2' - 3'
Term
Hydrants

Spaced no more than _____ feet
apart (actual requirements by
locality)
 Definition
1,000
Term
Domestic sewage is comprised of __% water
 Definition
99
Term
Suspended solids typically make up no more
than ____% of total sewage flow
 Definition
0.75
Term
BOD
 Definition
Biological Oxygen Demand - is a measure of the amount of organic matter
present, expressed in terms of the oxygen required to
biologically oxidize the material to a stable form
Term
SS content in domestic sewage is typically more than
__% organic matter
 Definition
80
Term
Peak factors vary based on sewer type
Laterals and submains – ___% of computed average
design flow
Mains and trunk lines – ___% of computed average
design flow
Interceptor sewer – ___% of computed average
design flow
 Definition
400
250
200
Term
 Minimum __’ separation between sewer line and
drinking water supply wells
 ___ horizontal separation from water lines
 ___ vertical separation from water lines
Water line located on top
When these minimum separation distances are not
obtainable, a DIP or concrete “sleeve” may be
required
 Definition
50'
10'
18"
Term
SDR
 Definition
Standard Dimension Ratio - SDR-35 is the most common for sewer
systems
Term
Manhole Placement
 Terminal end of any sewer line __ or greater in diameter
 Every change in alignment (horizontal and vertical)
 Every change in pipe diameter
 Junctions of multiple pipes
 Maximum spacing is a function of pipe diameter
____ for pipes 15” or smaller
____ for pipes 18-30”
 Definition
8"
400'
500'
Term
Drop manholes are used when there is more
than ______ of difference between the invert
elevations of connecting sewers. Purpose?
Reduce slope and turbulence
Maintenance
 Definition
2 feet
Term
Sewers should be designed to provide a
minimum velocity of ____ when the pipe is at
full flow.
 Definition
2 fps
Term
Typically, sewer lines should be a minimum of
__ in diameter
Exception when the line serves _ or fewer lots on a
cul-de-sac or other dead end branch
 Definition
8"

6
Supporting users have an ad free experience!