. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 170.— Diagram showing relation of dam and intake box. A, apron; B, intake box; C, core; D, drainpipes; E, bulkheads; F, screen; G. coarse grating; H, stream bed; I, spillway The form and the arrangement of a structure for regulating the volume of water flowing into a fishpond is shown diagrammatically in figure 170. The dam need not necessarily
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 170.— Diagram showing relation of dam and intake box. A, apron; B, intake box; C, core; D, drainpipes; E, bulkheads; F, screen; G. coarse grating; H, stream bed; I, spillway The form and the arrangement of a structure for regulating the volume of water flowing into a fishpond is shown diagrammatically in figure 170. The dam need not necessarily be high; from two and one-half to three feet of water in the deepest part of the pond formed by it will usually suffice. The in-' take box (B) is built in the side of the embankment so that it may be away from the swiftest part of the stream and therefore out of the path of ice and debris coming down during the early spring freshets. At G there should be a coarse grating in order to prevent any large masses, particularly ice, logs, and brush, from entering the intake box. F is a screen, loosely inserted so that it may be withdrawn and cleaned. It keeps leaves and other suspended material from passing into the intake pipe, which enters the box at J. The size of this pipe will depend on the size and the number of ponds to be supplied, but from four to six inches in diameter will be large enough to supply a pond of from four to six acres in extent. For a one-acre pond, the pipe must De at least two inches in diameter. At E on each side of the dam are the bulkheads, which are designed to protect the stream banks and should be as high as are the latter. The spillway (I), where the dam overflows, must be wide enough to allow free passage of ice and other debris during high water. The height must not be so great as to cause the bulkheads and the banks of the stream to overflow, yet it must be great enough to permit a gravity flow from dam to fishpond. A dam of any sort should be pr
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