![]() If you are using downloaded climate data, you will need to individually download 12 monthly. You can obtain the hourly wind speed data for the nearest weather station from the Government of Canada historical climate data site, or from an on-site weather station. Method A requires the determination of a site-specific wind factor (I) and total precipitation/snow on the ground factor (P) for the reporting year. Table 1: Default silt content values used in the calculator for Method A (MDAQMD, 2000) Stockpile material You are also able to enter a site-specific silt content, if you have this information. The Emissions Calculator determines the exposed surface area based on the footprint area and defined active area, where applicable.ĭefault silt content values are included in the calculator, as summarized in Table 1. A = exposed surface area of stockpile (m 2).The total emissions are then calculated by multiplying the EF by the exposed, active surface area.įor conical stockpiles, calculate the exposed area using: I = percentage of time with unobstructed wind speed >19.3 km/h in percent (%).The Calculator avoids double counting when further total precipitation accumulate on days with snow on the ground. P = number of days during the year with at least 0.254 mm of total precipitation (sum of total rainfall and the water equivalent of the total snowfal in mm) and days with snow on the ground. ![]() s = average silt loading of storage pile in percent (%).J = particulate aerodynamic factor with the following values:.The Emissions Calculator uses the following equation as the default method to calculate the annual particulate emission factor (EF) for elevated stockpiles and flat stockpiles that are infrequently disturbed:ĮF = 1.12x10 -4 x J x 1.7 x (s/1.5) x 365 x ((365-P)/235) x (I/15) Method A – Annual wind erosion emissions from stockpile surfaces
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