SITE Flashcards
parking access aisle size
Access Aisles: ALL ACCESSIBLE PARKING MUST HAVE AN ACCESSIBLE Aisles AT LEAST 60”WIDE ON AT LEAST ONE SIDE, EXTENDING THE FULL LENGTH OF THE SPACE.
ONE CAN BE SHARED BY TWO ACCESSIBLE SPACES, ON ANGLED ACCESS ON PASSENGER SIDE OF THE VAN.
slope formula
S = DE / L slope = Elevation Change (DE) / Distance (L)
slope Streets
Crown of paved street 2-3% Longitudinal slope of local streets 0.5 - 20%
slope Site drainage:
5% min away from buildings 2% min for impervious surfaces 1.5% - 10% for grass areas
slope Paved parking lots
2-3% 20% max
slope Sanitary sewers:
(1/4” / 1’ (2%) for 2” pipes, 1/8” / 1’ (1%) for 3-6” pipes)
slope ADA Ramps
Not greater than 1:12 (8.3%)
slope IBC Ramps
Not greater than 1: 12 (8.3%) when component of egress Not greater than 1: 8 (12.5%) elsewhere
slope athletic field
2% max
Min width of ramp
36”
max Run between landings
30’
max rise between landings
30”
Handrail of ramp
34-38” high Handrail required on both sides if rise greater than 6”, extend handrail 12” beyond top and bottom of ramp
Standard size parking
9’ x 19’
single and double loaded parking aisle - total width
single loaded aisles 43’
double loaded aisles 62’
sf per car
Ballpark 400 sf per car
Accessible car spaces
Accessible car spaces must be at least 96 inches wide,
acessible parking size + van space Size+ Vertical clearance
Accessible car spaces must be at least 96” wide (8’), Accessible van spaces must be at least 132” wide (11’). Accessible van spaces minimum vertical clearance of 98”.
1-25 TOTAL cars in lot, how many accessible spaces are needed?
1 AS
101-150 TOTAL cars in lot, how many accessible spaces are needed?
5 AS
500 - 1000 TOTAL cars in lot, how many accessible spaces are needed?
2%AS
1001 OR MORE cars in lot, how many accessible spaces are needed?
20 + 1 PER 100
Building orientation:
Ideally rectangular building with longer dim should be oriented east -west
CONSIDERING SLIGHTLY LOWER MORNING TEMPERATURES, Axis slightly east of south:
COLD CLIMATES, ENTRANCE BEST PLACED ON LEEWARD (WIND SHADOW) side to avoid cold winter winds.
In tempered climates entrances should be on the south side to make them more inviting and to capitalize on the natural snow melting effects of the sun. Hot climates long side can be oriented towards cooling breezes.
Building shape: Cold Climate
square or cubic - surface are should be minimized for heat loss during winter
building shape for Tempered climate
shape has less effect. Elongated for winter sun gain
Building shape for Hot arid climat
squarer shapes, external load dominant - courtyards, internal load - solid multistory
Building shape for Hot humid climate
elongated east west, courtyards, broad overhangs
albedo
how much albedo has a black surface? a mirror?
or solar reflectance (SR)
fraction of radiant energy received on a surface that is reflected.
Number from zero to 1.0.
black surface that absorbed all the light has albedo of 0, a mirror an albedo of 1.
Emissivity
is inverse to albedo, ability of a surface to emit stored energy 0-1.0
(opaque surface emissivity and albedo add up to 1.0 thermal emittance or emittance)
Solar reflectance index (SRI)
black surface
mirror surface
Solar Reflective Index
albedo and emissivity combined…
measure of a roofs ability to reject solar heat
- black surface (with reflectivity of 0.05 and emittance of 0.90) has an SRI of zero
- white surface (reflectivity of 0.80 and emittance of 0.90) SRI of 100
Reflective surface would have an SRI of about 122
Liquid Limit of soil
Moisture content at which a soil will flow and not retain its shape
Plastic Limit of soil
Moisture content at which a soil deforms plastically. (rolled into long threads – measure of how thin it can roll without cracking)
Plasticity Index (PSI) of soil
Numerical difference between Liquid Limit and Plastic Limit, which results in a range of moisture in which soil behaves as a plastic material.
A PI over 15 is a good measure of an expansive soil.
Liquid Limit - Plastic limit = PSI
f.e. 79 LL - 71PL = 8PSI
chance of 100 year flood:
1% chance
chance of 10 year flood:
10% chance
Base flood elevation (BFE)?
Freeboard?
Regulatory floodway?
Base flood elevation (BFE) - rounded whole foot elevation of 1% annual chance of flood. Local jurisdictions use it to determine finish floor elevations in residential structures.
Freeboard: additional height above BFE by local jurisdiction requirements
Regulatory floodway: area required to remain free of encroachment to allow 100 year flood to flow freely. Fed regulations default to 1foot
what is a basin
underground reservoir that has sump built into it. Debris settles in the sump instead of flowing down the sewer. Gets cleaned out periodically.
Required capacity is based on size of area to be drained, runoff coefficient and amount of water to be drained at most severe storm anticipated by design.
Holding pond
for runoff exceeding local sewer system capacity.
Releases into system at a controlled rate.
what is a catch basin
is used to contain runoff until it can flow into a storm sewer, which will not contribute to supplemental irrigation.
concave or convex slope?
concave slope
concave or convex slope?
convex slope
angle of the sun at solar noon during sommer solstice , winter solstice and the equinoxes when the lattitdue is given.
