Laserfiche WebLink
<br />Duration of Storms <br /> <br />Foremen indicated that the effort required to remove a given amount <br />of snow depends on the duration of its fall. In general, the shorter the <br />storm, the less time required for removal. Because snowfall at the <br />observation sites used in this study is recorded only once each day, we <br />could not determine the duration of particular storms for which the model <br />estimates removal costs. We est~ated duration by examlnlng <br />precipitation records at hourly recording sites in Colorado with similar <br />elevation, exposure and average annual snowfall. Data from these sites <br />were obtained from Professor Lewis Grant and the Colorado State <br />University Atmospheric Science Department. Storms at these sites were <br />defined by consecutive hours of precipitation of at least .01 inch. <br />Tbtal precipitation was computed for each storm and regression equations <br />relating duration to amount of snow were used to assign a duration to <br />each storm. * <br /> <br />We assumed that the duration of augmented storms that yield a given <br />amount of snow is identical to the duration of storms that yield the same <br />amount naturally. <br /> <br />*Precipitation (inches of melted snow) was converted to inches of snow <br />assuming a density of .08 grams/cubic centimeter (about 12 inches of snow <br />per inch of water), the mean density observed by Grant and Rhea (1973) <br />over 12 years at a dense network of stations near Climax, Colorado. <br /> <br />-13- <br />