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Computed maximum snow loads
CANA S er THl B92 no. 34 c * 2 r n G
c o m m
W L M U M S N O W LOADSM,K.
!hornas and D,W. BoydI
-,
.-
.-, p ' \+ &!?~,fFLIT, tho ma^ and D.W. Boyd
The maximum snow l o a d can be d e f i n e d as the weight per
u n i t a r e a of t h e heaviest accumula-kLon of precipitation on a horizontal. unheated s u r f a c e that will o c c u r , on the average, once in a given number of y e a r s . In practice, this load must b e estimated from existing rneteoro2ogiczl records. !These
r e c o r d s for Canada i n c l u d e the daily or weekly depths of snom on the ground since about 1941, and the d a i l y r a i n f a l l arnoun-bs, but do not at present include any measurements of w e i g h t s of
a c h a l snow
on
roofs, A sumey has beer, s t a r t e d by t h e M v i s i o nof Building Research t o measure depths and densities of snow
on r o o f s
b u t u s a b l e r e s u l t s will n o t be available f o r a f e w years.F o r t h e t i m e being, t h e r e f o r e , it is assumed %hat the
anow lead
on
a h o r i z o n t a l unhea%ed r o o fis
t h e same as t h e loadon t h e ground. The comp~tted maximum snow l o a d s listed
in
thisn o t e are based on t h e maximum r e p o r t e d depth
of
snow an t h egroun6 in the ten years from 1942 to
1950
whenever these r e c o r d s are avaflable. This snow is assumed to have a s p e c i f i c gravityof 0.2, l o t h e w e i & t
of
the snow is added t h e weight of the maximum 24-hour r a i n f a l l expectedin
t h e two- or three-monthp e r i o d when maximum snow depths a r e likely.
Complete snow depth and rainfall records
are
n o tavailable f o r a l l the s t a t i o n s l i s t e d ; t h e missing values have been estimated from whatever records could be obtained. The final computed values have been rounded off to the nearest
f i v e pounds per square foot,
A more corrplete discussion of the computation of snow l o a d s f o r Canada, and a comparison of the computed loads w i t h
those in a nurnbex of municipa3, b u i l d i n g codes are included in
a paper by Thomas (1). The c h a r t of computed maximum snow
l o a d s in Thamasfs p a p e r is also published in the N a t i o n a l
B u i l d i n g Code (2 ) and in the Climatological Atlas of Canada (3 ) , In some cases it will be f b m d t h a t t h e values listed in th5s note do n o t agree precisely with the c h a r t , Discrepancies
a r i s e because it 5 s not always p o s s i b l e t o c b a d l o c a l variations, especfally in areas where t h e r e arc great variations in snow
l o a d s across short distances.
Records f a r stations not S l s t e d can be o b t a i n e d by writing to the Secretary, Associate Committee on t h e N a t i o n a l B u i l d i n g Code, National Research C o u n c i l , O t t a w a .
References
(1) Thomas,
M.K,
k methodof
computing maximum snow loads.R e p r i n t fram Engineering Journal, vob.
38,
no, 2,February
1955,
National Research.Cayncil of Canada,Division of B u i l d i n g Research, mRC 3559, March
1955.
( 2 ) National Research Council of Canada, Associate Committee
on t h e Tational Building Code. National Building Code
of
Canada1953,
\ 3 )
Thomas,M.K.
Climatologic81 atlas o f Canada. Prepared by M.K. Thomas, December 1953. ( A joint publicationof the Mstsoralogical Mvision, Department af B a n s p o r t and the Division of B u i l d i n g Research, lJationa1 Research
CORlPl?TD WZ.m SITOW LOAD Aldergrove Castlegar C h i l l i t ~ a c k Comox Estevan F a i n t Fort Xelsan Holberg Hope Kamlo ops Masset (Ib. p e r sq. ft.)
BRIPISH
COLUh'BlA Calgary Claresholrn 25 Cold Lake 2 5 30 Edmonton Grande 7Zra5mie 25 40 L e t h b r i d g e 25 Dundurn Moose Jaw Prince Albert Beausejaur Brandon Churchill F l i n Flon G i r n l i Macdonald FJa t s q u i mew Westminster Penticton Wince George P r i ~ c e Rupert S w i f t E v e r T o f i n o Vancouver V i c t o r i a Warfield McMurray Medicine H a t 25 lama o 25 Red Deer 25 30 V e g r e v i l l e \'!ainmri ght 25 30 Regina 30 Saskatoan35
%if% Current 25 Portage la R a i r i e 35 R i v e r s 35 St. V i t a l 7 5 S h i l o Camp 35 The Pas 40 Winnipeg 35 m s Arms t r o n g Aurora Barxi e Barriefield B e l l e ' l r i l l e 50 B l i n d River 50 Brantf o r d 35 Camp Berden 60 Centralia 50Chatham Clinton Cobourg
Dona
Domrasvlem Edgar Falconbridge Fort William Foymount Gloucester Gu elph Hamilton Kapuskasing Ungs ton E t c h e n e r London Maltan Eiagara F a l l s North Bay Oshawa Ottawa Owen Sound P a p a M i d a llylmer B a g o t v l l l e Bouchard Casey Clarke City DorvaE Hull Knob Lake Lachine Mont 3011 ltontreal Outremoat ParentPamour
Pe tawawa Pe-t-exborough P i c t a n P o r t Arthur Por* Ttlaitland Rockclf_ffe St. Catherines St. Thomas Sarmia S a u l t See. Marie Simcoe Sioux Lookout Stxatf o r d Sudbury 'Pimmins Toronto Trenton I k l l a n d We s t o n V?ixldsor Roods-bock Port Rarrison Quebec C f t y St. F e l i c i e n St. Hubert; St. Johns St. J o v i t e S e m e t e r r e Seven I s l a n d s Sherbrooke !Three Rivers V a l c a r t i e r V a l d l O s Verdun Campbellton Chatham Fredericton Gagetom 75 Mc Gimey 70 Monctan 6 5 Renous 60 Saint JohnCornmallis Dartmouth Debert Digby Greenwood NOVA SCOTLA 40 Half fax 40 Newport
50
S y f h e y 40 Wigdsor 40 Yamou%hFRIRCE EDlBARD ISWJD
C h a r l o t t ~ t a m 60 Summerside C o m e r Brook Gander
