tion of stations used in his analysis. He plotted this for

of the weight. The other five individuals felt that both

some case studies.

the NWS and non-NWS data sets were of comparable

The three SENH practicing structural engineers had

value, each having its own strengths and weaknesses.

participated in the pilot study. Each had developed a

The individual who focused on the non-NWS data only

slightly different way of doing case studies. They chose

included NWS information when few non-NWS data

not to work on the case study plots, believing them to

were available. He attempted to have 6 to 8, and occa-

contain too much information of limited value, which

sionally 10, stations with 20 or more years of record

hides trends of interest. Instead, they reanalyzed only

in his analysis. He did not use stations where the

the better stations in the data tabulation. One of them

Pg/Pmax ratio was greater than 1.5. He re-plotted the

felt that the NWS co-op information, since it is based

Pg values selected vs. elevation and used a straight

on measurements of the depth of snow on the ground,

line, least squares fit to establish a preliminary answer.

That answer was modified with consideration given

not measurements of the weight of that snow, is infe-

rior to the non-NWS values, which are measurements

to the slope of his trend line and the scatter of points.

SNOW LOAD CASE STUDY FOR

Salisbury, New Hampshire