What are the three ways of entering barriers that will affect the sound level results?
• Perturbable-height barrier: Only affects the sound level in the “with barrier” case. Barrier attenuation is not included in the “no barrier” sound level. The “no barrier” and “with barrier” sound levels will be different. Perturbable-height barriers allow for multiple adjustments to the barrier height (one of them being to a height of zero) when performing a barrier analysis. To implement: set the “#up,” “#down,” and increment size to non-zero values. • Single-height barrier: Only affects the sound level in the “with barrier” case. Barrier attenuation is not included in the “no barrier” sound level. The “no barrier” and “with barrier” sound levels will be different. Single-height barriers allow for only one adjustment (to a barrier height of zero) when performing a barrier analysis. To implement: leave the “#up” and “#down” perturbations at zero, but make the increment size non-zero. • Fixed-height barrier: affects the sound level in both the “no barrier” and “with barrier” cases. Ba
