HTML Overpressure - IMPERIAL Created by Brent Buffham © 2024 - Imperial Units (US) Distance in feet (ft), Charge weight in pounds (lb), Sound in decibels (dB) Go Back... Metric Overpressure Imperial Vibration Imperial Blasting Select the Calculation Decibels Site K Constant Distance (ft) Weight Influencing Charge (lb) Site a Constant (attenuation) Site b Constant Inputs Decibels (dB) Site K Constant (K) Lineal Distance to Site (ft) Weight Influencing Charge (lb) Attenuation Value (a) Beta Value (b) Additional Comments ... Scaled-distance overpressure estimator presented in imperial units (dB, ft, lb). The pressure form P = K * (D / W^b)^a follows the same shape as the metric Overpressure calculator on this site (originally published as VibeSD on the Apple App Store in 2010). K, a and b are site-specific and must be calibrated against measured air-blast events in the units used here. Brent Buffham © 2024.