Noise mitigation barrier
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NOISE MITIGATION - BARRIER. To mitigate noise in exterior recreation areas: Rearrange site (potentially provides both distance and barriers) Put up a noise-specific barrier

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NOISE MITIGATION - BARRIER

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Noise mitigation barrier

NOISE MITIGATION - BARRIER

  • To mitigate noise in exterior recreation areas:

    • Rearrange site (potentially provides both distance and barriers)

    • Put up a noise-specific barrier

  • If there are existing barriers such as buildings or topographic features between project site and noise source, first evaluate whether they provide sufficient mitigation

  • Mitigation should be in direction of main noise source(s)


Noise mitigation barrier1

NOISE MITIGATION - BARRIER

  • To be effective, barrier must:

    • Interrupt line of sight between noise source and receptor

    • Be continuous, and extend to the ground surface

    • Be of a material that will absorb sound energy

      • When considering wooden fences as barriers, incorporate an air space between two continuous fence surfaces to increase effectiveness

      • Noise Guidebook has Transmission Loss Values for evaluating the relative effectiveness of various materials


Noise mitigation barrier2

NOISE MITIGATION - BARRIER


Noise mitigation barrier3

NOISE MITIGATION - BARRIER

  • To evaluate barrier, need to know:

    • Observer elevation

    • Noise source elevation

    • Current and projected noise levels

    • Elevation of the top of the barrier

    • Distance, observer to barrier

    • Distance, barrier to source

    • Angle subtended by barrier


Noise mitigation barrier4

Sample site:

Observer elevation: 525 ft

Source elevation: 514 ft

Current noise level: 71.83 dB

Projected noise level: 72.38 dB

Barrier top elevation: 546 dB

Observer-barrier distance: 141 ft

Barrier-source distance: 523 ft

Barrier angle: 95 degrees

NOISE MITIGATION - BARRIER


Noise mitigation barrier5

NOISE MITIGATION - BARRIER

  • Follow calculations in Noise Guidebook Workchart 5


Noise mitigation barrier6

NOISE MITIGATION - BARRIER

  • Refer to Workchart 6 and Workchart 7 in guidebook as directed by Workchart 5 to complete evaluation


Noise mitigation barrier7

NOISE MITIGATION - BARRIER

  • To improve barrier performance without changing dimensions:

    • Move closer to observer – increases effective angle of barrier

    • Angle ends toward observer – also increases effective angle

    • Angle top toward source – increases effective height of barrier


Noise mitigation barrier

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