applied only to main and branch canal totals, while 1,400 miles of laterel 
canale, capable of producing ducks, were unworked and thus not included in 
the eetimates. Creekea and rivers, the most difficult unlta for which to 
establieh a total mllesage of waterfowl usage fleure, were ortinated from the 
eection mileage covering the esampling radius. The total 1949 swomer popula- 
tion for central Waehington was estimeted at 26,447 waterfowl, 7,071 adulte, 
and 19,376 young. 
105 
