Unless you have crystal clear water or have funds to pay divers, it is good design practice to incorporate a screen retrieval system.
A retrieval system allows safe, efficient, above-water access for viable inspection or physical maintenance if required.
It is possible to design and operate a Fish Exclusion Screen in a fixed (underwater) location without a retrieval system but whole of life costs need to factor in maintenance and compliance inspections using divers, cranes or dewatering. All Fish Exclusion Screen designs require inspection and maintenance. A smart screen design, high build quality and high quality installation usually dictates reduced maintenance and inspections.
In general all screens should be visually inspected annually, a retrieval system makes this process safer, quicker and cheaper.
A well designed retrieval system should have the same design methodology as the screen in relation to quality material and components.
