. Cranberries; : the national cranberry magazine. Cranberries. use water-level recorders which might aid the grower in checking his management. I believe one of the Erie Canal navigation locks is filled and emptied by a manually- controlled siphon. The larger structures, applied to cranberry bogs, would necessarily be built of concrete. They would require exacting carpentry in the formwork in order to obtain the smooth, curved surface necessary. The inside form for a gooseneck pipe would stump the average do- it-yourself grower. Roughness in most places would just waste ener- gy and reduce out
. Cranberries; : the national cranberry magazine. Cranberries. use water-level recorders which might aid the grower in checking his management. I believe one of the Erie Canal navigation locks is filled and emptied by a manually- controlled siphon. The larger structures, applied to cranberry bogs, would necessarily be built of concrete. They would require exacting carpentry in the formwork in order to obtain the smooth, curved surface necessary. The inside form for a gooseneck pipe would stump the average do- it-yourself grower. Roughness in most places would just waste ener- gy and reduce outflow, but in the throat of a siphon it could cause cavitation which might take the thing to pieces. The writer does not make any pretense of being competent to de- sign all these structures. His advice at various stages might be useful. The grower could probably get as- sistance fronr the hydraulics de- partment of one of the nearby col- leges and universities if he wanted to build one of these structures. The purpose of this article is mere- ly to acquaint the grower with some of the possibilites in modern design of water-control structures. Another variation from current flume design is the dog-leg flume. This has a vertical drop at some convenient point inside the flume between inlet and outlet. The wa- terfall effects are kept away from the outlet; deep excavation is avoid- ed at the inlet; this type of flume can be designed for maximum air entrainment and consequent oxy- gen enrichment. Oxygen deficiency has been under study for several years in New England. If it should be found that oxygen enrichment is important, the dog-leg flume will become important. This flume cor- responds most closely with the "drop" of technical hydraulics. Canal Designs Canal design is another place where the growers could well be more scientific. A canal of given size, at a given fall per hundred feet and with a known degree of roughness in the channel, will de- liver a definite quant
Size: 1575px × 1587px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcontributorumassamherstlibraries, bookspons
