Development of the Proposed Canadian Noise‐Level Regulations For Vessels Engaged in Towing

The paper will describe the towboat noise‐control experiments, noise‐level survey, and general rationale behind the Proposed Canadian Noise‐Level Regulations for Vessels Engaged in Towing (1975). The proposed regulations are based on what was determined to be the technically feasible noise levels for the large majority of British Columbia vessels at the time of the study with provisions for reduced levels for vessels constructed in the future when marine‐noise‐control practices will have advanced and become more widely adopted. The relative importance of airborne and structure‐borne noise transmission aboard towboats and the significance of this relation to the general philosophy of towboat noise control will be discussed.