Water-power; an outline of the development and application of the energy of flowing water . e following day, theboards may be removed. If heavy rains occur during the nightwhile the are up, the water may not fall during theensuing day sufficiently to permit their removal, and, the rivercontinuing to rise, they must go down-stream. Many water-power streams are subject to ordinary floodsof 6 feet and more, and no material injury to any riparianinterest would result from the maintenance of ofthat height provided free way could be given in time of flood. 148 APPEXDACES OF
Water-power; an outline of the development and application of the energy of flowing water . e following day, theboards may be removed. If heavy rains occur during the nightwhile the are up, the water may not fall during theensuing day sufficiently to permit their removal, and, the rivercontinuing to rise, they must go down-stream. Many water-power streams are subject to ordinary floodsof 6 feet and more, and no material injury to any riparianinterest would result from the maintenance of ofthat height provided free way could be given in time of flood. 148 APPEXDACES OF DAMS. The maintenance of this height b\- the method of pins wouldprobably be impossible, and, if possible, the loss of the flash-boards at every freshet would be a serious matter. Fig. 70 isa design for a system of flashboards to maintain this height,and, at the same time, to admit of being lowered in any stageof the ri\-er without danger to the workmen. This is given asa suggestion worthy of study, not as a de\-ice sanctioned byexperience and usage. Fig. 70 shows the method as applied. Fig. an existing dam. Its application to a dam specially-designed with that view would be simpler. The barrier con-sists of a line of shutters hinged to the up-stream crest of thedam and supported when up by props resting near the down-stream crest. When down, the shutters lie flat on the dam andare very little exposed to injury. When the shutters are up,a chain is stretched along the top of the dam between the propsand shutters, and runs from the abutment to a capstan locateddown-stream on the bank. Fig. joa. V>\ winding in on thecapstan, any desired strain can be brought upon the outsideprop. When this yields the strain comes on the next propand the shutters can then be thrown down in succession. sliows the situation in plan. It shows the arrangementthat would be proper in case of an angle in the dam, as some- flashboards. 149 times occurs. A trapezoidal pier would be built u
Size: 1534px × 1629px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
