. Columbia River fisheries development program. Fisheries Columbia Figure 33 An unscreened diversion ditch in the Salmon River Drainage, Idaho. Since the Program began, over 600 irrigation diversions have been screened, more than 400 of which were built on the John Day watershed. Some have been phased out because of changes in methods of securing the irrigation water. Many of the current irrigation projects pump water from streams and spray it onto fields. All that is required in this type operation is a screen on the pump \fcr. A water powered fish screen constructed on an ir
. Columbia River fisheries development program. Fisheries Columbia Figure 33 An unscreened diversion ditch in the Salmon River Drainage, Idaho. Since the Program began, over 600 irrigation diversions have been screened, more than 400 of which were built on the John Day watershed. Some have been phased out because of changes in methods of securing the irrigation water. Many of the current irrigation projects pump water from streams and spray it onto fields. All that is required in this type operation is a screen on the pump \fcr. A water powered fish screen constructed on an irrigation diversion under the "; 24. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. National Marine Fisheries Service. [Washington, D. C. ] : U. S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service
Size: 2224px × 1123px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookd, bookleafnumber30
