Overflow spillway for dams, weirs and similar structures
AssigneeGTM Batiment et Travaux Publics
InventorFrancois Lemperiere
Life of this patent
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Abstract
For the purpose of effecting a quasi-permanent raising of the normal water level of an impounded reservoir and thereby augmenting its storage capacity except during the passage of major floods, the invention consists of rigidly fixing to the sill of the spillway a water level raising means comprising at least one vertical plate capable of resisting the water loads when spilling moderate heads (for discharging the floods of shorter recurrence intervals) but bending at its lower portion where it is fixed to the sill at a predetermined head not higher than the maximum water level in order to discharge larger floods.
Claims13
Overflow spillway for dams and similar structures comprising an overspill sill having a crest set at a first predetermined level, lower than a second predetermined level corresponding to a maximum reservoir level for which the dam is designed, the difference between the said first and second predetermined levels corresponding to a predetermined maximum discharge of a design flood, and a water level raising means on the sill of the spillway, wherein the water level raising means comprises at least one water level raising element in the form of a substantially vertical plate having a lower portion which is rigidly fixed to the sill of the spillway, the said element having a predetermined height which is less than the difference between the aforementioned first and second predetermined levels and which corresponds, for a headwater level substantially equal to the said maximum level to a mean flood with a predetermined lower discharge than the predetermined maximum discharge, the said element being of such thickness at its fixed lower portion and made of a material with such a yield point that the moment of the forces applied to the water level raising element by the water comes to equal the resisting moment at the fixed lower portion of the said element so that the said water level raising element bends about a line when the headwater reaches a third predetermined level higher than the top of the water level raising element but not higher than the second predetermined level.
Dependencies are inferred from the claim text.