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Stationary vertical screens on gravity flow diversions have frequently proved inadequate in preventing fish losses. Two alternative screen designs which incorporated both vertical and submerged horizontal screens were evaluated at Loon Inlet Creek in the southern interior of British Columbia to assess required cleaning frequency, effectiveness in bypassing fry and juvenile trout back to the stream, and proportion of water diverted. Apertures in the vertical screens would not permit fish passage, but those in the horizontal screen with suspended materials necessitated a cleaning frequency of three to seven days in spring during 1973 to 1975 and 22 days during, 1974. The larger aperture horizontal screens were obstructed less rapidly than the vertical ones. Fry and juvenile trout were readily returned to the stream when bypass flows were 3 to 5% of the diversion flow. During the fry migration period 95.1% (lower structure) and 99.5% (upper structure) of fry moving into the diversions were passed over the la
Slaney, P.A.. 1977. An Evaluation of a Diversion Screen Design and an Assessment of Fish Losses in Irrigation Diversions of Loon Inlet Creek, British Columbia. Fish and Wildlife Branch. Fisheries Management Report. FMR68
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