Riverine Entrainment / Impingement Studies
APEM regularly undertake fish entrainment/impingement studies to assess potential impacts upon protected species and sites and to identify fish screening requirements.
As an example, one key project was an EU Habitats Directive driven study of seven potable water intakes and two fish farm intakes in the Welsh River Dee catchment intakes including the calculation of population estimates to facilitate assessment of loss at the population level, and potential for impact upon site integrity. These data enabled APEM to recommend screening upgrades at some of the sites, whilst demonstrating to regulators that fish losses at other sites were not having an impact on site integrity.
Further project examples include the assessment of survival of bandscreen handled lamprey on the River Derwent and the extent of the entrainment of all fish species with a focus upon larval and juvenile shad on the Rivers Wye, Usk and Tywi.
