Ingegneria e Contracting . tained per l'intero canale ofBogue frettoloso, Pecan Bayou, tra Est e Ovest BogueHasty, dimostrare l'effetto delle condizioni describedupon il valore di n. Questi valori possono essere utilizzati come aguide nella progettazione di canali di drenaggio dove come con-ditions possono ragionevolmente attendersi di esistere a causa thelack di mantenimento dei canali o per il franamento delle banche. Questi dati dovrebbero anche servire un utile pur-pongono nello stimare lo scarico dei vecchi canali wherelike prevalgono condizioni. Il Fosso di Gopher costruzione. La figura mostra un fosso gopher constructionon t

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Engineering and Contracting . tained for the whole channel ofBogue Hasty, Pecan Bayou, and East and West BogueHasty, demonstrate the effect of the conditions describedupon the value of n. These values can be used as aguide in the design of drainage channels where like con-ditions can reasonably be expected to exist due to thelack of maintenance of the channels or to the caving in ofthe banks. These data ought also to serve a useful pur-pose in estimating the discharge of old channels wherelike conditions prevail. GOPHER DITCH CONSTRUCTION. The illustration shows a gopher ditch constructionon the lands of the Santa Ana Sugar Co. in SouthernCalifornia. This is a type of ditch of which many mileshave been constructed for sub-surface drainage. It hasthe advantage over open ditches that no land is takenfrom cultivation and no barrier is formed to free travelfor agricultural operations. It calls for less investmentthan tile drains. Its disadvantage is the possibility ofcomplete closure by caving. A short life would also. ^. Gopher Ditch for Land Drainage. seem to be natural, but it is stated that it has been foundthat gopher ditches will give service from 5 to 14 years, depending upon the character of the ground. The construction of gopher ditches requires specialmachinery. At the Santa Ana farms the outfit compriseda special gopher ditch plow and three Holt caterpillartractors for hauling the plow. The plow is the specialtool. It consists of a strong carriage, which rides on thesurface and carries, projecting downward, the plow prop-er, which can be raised and lowered by suitable mecha-nism. Attached to its heavy framework is a single knife-blade beam, thin enough to avoid any great disturbance 232 on the surface of the soil, yet wide enough to give itstrength for withstanding the terrific strains to which itis subjected. The construction of this part of the tool isvery similar to that of a subsoiler. At the point, however, there is attached a torpedo-shaped affair, made o

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• bookpublisherchicago
• bookyear19