US991907A - Spillway. - Google Patents

Description

GEORGE I. STICKNEY, OF'ALBANY, NEW YORK.

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Specification of Letters Patent.

Patented May 9, 1911.

Application filed March 20, 1911. Serial No. 615,738.

To all whom it may concern:

Be it known that I, GEORGE F. STICKNEY, a citizen of the United States of America, residing at No. 28 Lancaster street, city of Albany, in the county of Albany and State of New York, have invented certain new and useful Improvements in Spillways, of which the following is a specification.

My invention relates to spillways, and the object of my invention is to provide a siphon s 1llway by means of which the water at a am or reservoir may be quickly discharged when the storage capacity is exceeded and the surface level is raised above a certain fixed degree; together with such other elements and combinations as are hereinafter more particularly set forth and claimed. I accomplish these objects as illustrated in the accompanying drawing, in which:

Figure 1 is a cross section. Fig. 2 is a front elevation of a dam provided with my invention.

Similar letters refer to similar parts throughout the several views.

The dam, A, constructed of concrete or other suitable substance, is provided with an inverted U-shaped tube or conduit, BOD, extending through the dam, A, having its inlet, B, and its outlet, D, below the low water plane, and the highestpart of the conduit, C, at or below the hi h water level. The inlet end, B, is prefera ly flared out to provide an easy entry for the water. It may be placed at any desired location below the low water surface, preferably sev-' eral feet below to avoid the entry of floating drift. The crown or highest part, C, of the siphon must be placed betwen the low and hlgh water planes, prefer'ably with its lower limit at the low water level and its upper limit at or below the hi h water level. The

outlet end, I), may be p aced at any desired lows :As the water level above the dam rises the vent, E, is submerged and this air velocityof flow through the conduit is largely increased. The water surface above the dam gradually falls on account of the discharge in the siphon and a stage is finally reached where the vent, E, becomes exposed and air flows into the crown of the siphon, stopping the siphonic action, and, as the water surface is now below the lowest part of the conduit at the crown, C, the flow of water entirely ceases.

What I claim as my invention and desire to secure by Letters Patent is:

1. A spillway comprising a dam; a closed conduit siphon of an inverted U-shaped form when in position, the crown being between the low and high water planes; said dam provided with an air passage extending from at the low water level to a point in the si hon near the crown thereof.

2. s illway comprising a dam; a siphon therein, 1ts crown being between the low and high water level; the inlet placed well below the low water level and provided with a flaring mouth; an air vent extending through the dam from near the crown to a point at the low water level, substantially as described.

3. In a s illway the combination of a. dam, a con uit, U-shaped in form, placed therein, one leg of the conduit lower than the other and one extending through the dam on one side, the othenon the opposite side; an air vent near the crown of the con- .duit extending through the dam to a point at the low water level, substantially as described.

In testimony whereof I have aflixed my signature in presence of two witnesses.

Witnesses Lo'rrm PRIOR,

FREDERICK W. CAMERON.

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