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1 <br />• Contains mechanical and/or electrical parts which requires a high level of maintenance <br />• Fish passage may occur through faulty or worn seals or areas out of roundness where seals do <br />not fit well <br />• Not designed to screen out small life stages <br />• Does not work well under ice conditions unless enclosed or heated <br />• Redundancy, fixed screen inserts, or blockouts are required for maintenance <br />• Small life forms can pass seals <br />• Sediment accumulation upstream or downstream <br />Application to Limiting Downstream Passage. The typically large mesh openings (>2 mm) and <br />gaps at the rotating element seals eliminates this type of exclusion device from serious consideration <br />for project objectives that include smaller life stages. In cold climates, the screens must be fully <br />enclosed, again reducing this features applicability. In addition, the typical use in shallow water <br />reduces their applicability to reservoirs or spillway approaches. <br /> <br /> <br /> <br />1 <br />1 <br /> <br />1 <br />t <br /> <br />1 <br />I <br />Control Structure Feasibility Evaluation <br />Miller Ecological Consultants, Inc., February 18, 1997 <br />1-13