Civil Engineering Reference
In-Depth Information
in
Figure G7-6
, it could be argued that the limit should be 1
10. On the other
hand, in relation to snow drifting onto road surfaces, a full drift has a rise to
run of 1
6 according to Tabler (1994).
Equation G7-3
provides the surcharge drift height for leeward wind.
To convert height to an equivalent snow load, the density or unit weight of
the snow is required. ASCE 7-10 uses the following relationship for the unit
weight of snow,
, in lb/ft
3
:
γ
30 lb/ft
3
γ=
0.13
p
g
+
14
≤
Equation 7-3
where the ground snow load,
p
g
, has units of lb/ft
2
. This relation was origi-
nally developed by Speck (1984). Equation 7-3 illustrates that the snow density
is an increasing function of snow depth.
Figure G7-7
is a plot of snowpack
LIVE GRAPH
Click here to view
Figure G7-7
Snowpack density
versus snowpack
depth as per Equation 7-3
in ASCE 7-10.
