Use of Avoidance Rates in the SNH Wind Farm Risk Collision Model

The SNH Collision Risk Model (CRM) provides an estimate of the potential number of bird collisions likely to occur at a proposed wind farm. Birds react to a wind farm in different ways. Some may be displaced from the area of the wind farm, while others may avoid turbines or take other evasive action to prevent a collision. The CRM first estimates the number of collisions that would occur if the birds were to take no avoidance action. It then applies an avoidance rate to take account of the likely degree of successful avoidance.