PA Flashcards
What is the formula for slope percentage
(Rise / run) x 100
Slope for sewers
1/4” = 1’-0” (2% for 2” pipe)
or
1/8” = 1’-0” (1% for 3-6” pipe)
Slope for site drainage
5% adjacent to buildings
2% for impervious surfaces
1.5%-10% for grass
Slope for parking surfaces
2-3%
Slope for ADA ramp
1:12 (8.33%)
Slope for IBC ramps
1:12 for egress ramps
1:8 for non-egress ramps
Define flood plain
Area at risk for accumulation of water
Define water table
level at which the soil is fully saturated
Define impervious surface
Does not allow the passing of water
Define wetlands
Area with fluctuating water levels / marshes, native plants, wildlife, etc
Define greywater
Domestic wastewater (does not contain solids or waste)
i.e. kitchen wash water, laundry water, etc
Define runoff
streams formed from irrigation or precipitation
What is dry floodproofing?
Protecting a building from the exterior by making it watertight
What is wet floodproofing
modifying the interior of a building to allow water in and minimize the impact is has on the building
What is the percent chance that a 100 year flood will occur each year
1%
What is Base Flood Elevation
the height to which water water can be expected to rise in base flood. Used for insurance premiums and building construction requirements
What is USCS and what do they do
Unified Soil Classification System - describes the size and composition of soils
What are the 5 major classifications of soil
gravel
sands
silt / clays (LL<50%)
silt / clays (LL>50%)
organic soils
What kinds of soils can never support a foundation
silt/clays
organic soils
What are the two general types of foundation forms
spread and pile
What is angle of repose
max angle or slope of a material before collapse
What is liquefaction
When a soil behaves like a liquid - very bad for foundations
What is a kip
equal to 1000lbs
What are typical dimensions of loading areas
10-12’ wide
40’ long
14’ height clearance
60’ turning radius